Jiangsu Tianqixing Robot Introduction: What are the requirements for the installation of the fixture on the injection molding robot?

The following requirements should be considered when installing the fixture on the injection molding robot:

First, the accuracy requirements

positioning accuracy

The positioning accuracy of the fixture on the manipulator is very important. It needs to be installed accurately to ensure the accuracy in grasping and placing injection molded products. Generally speaking, the positioning accuracy of fixture should reach ±0.1mm-±0.5mm, which depends on the size and accuracy requirements of injection molded products. For example, for an injection molding manipulator that produces high-precision electronic component housings, the positioning accuracy of the fixture may need to be controlled within ±0.1mm to ensure that the product can be placed in the specified position accurately and avoid dimensional deviation or assembly problems.

In order to achieve high-precision positioning, high-precision positioning pins and positioning holes can be used for installation. The diameter tolerance of the locating pin is generally controlled within ±0.01mm-±0.03mm, and the tolerance of the locating hole is slightly larger, but it should also be closely matched with the locating pin to ensure the position accuracy of the fixture on the robot hand.

Repetitive positioning accuracy

The fixture also needs to have good repetitive positioning accuracy. In the process of multiple grabbing and placing cycles, the fixture must be able to return to the same position to ensure the consistency of production. The accuracy of repeated positioning is usually required to be between 0.05 mm and 0.2 mm. This is especially important for high-speed continuous operation on automatic injection molding production line.

The repeated positioning accuracy of the fixture can be improved by selecting high-precision rotary joints and linear guide rails. These parts have high movement accuracy, which can reduce the position deviation caused by mechanical movement and ensure the position repeatability of the fixture in each operation.

Second, the load capacity requirements

Static load capacity

The weight of the fixture itself and the load it bears when grabbing the injection molded product cannot exceed the static load capacity of the manipulator. When selecting the fixture, it is necessary to consider its weight and match it with the load parameters of the manipulator. For example, if the static load capacity of the injection molding manipulator is 10kg and the weight of the fixture itself is 2kg, the product weight cannot exceed 8kg when it grabs the product.

It is necessary to consider the influence of the demoulding force of injection products in the mold on the fixture load. Some injection molding products may need a large pulling force when demoulding due to complicated structure or mold design, which requires the fixture to have enough static load capacity to bear this instantaneous large pulling force to avoid the fixture from loosening or being damaged during demoulding.

Dynamic load capacity

When the manipulator moves at a certain speed and acceleration, the dynamic load borne by the fixture is an important factor. The fixture needs to be able to withstand the inertial force generated by dynamic load. In the case of high-speed movement, the dynamic load may be much larger than the static load.

According to the motion speed and acceleration of the manipulator, the dynamic load capacity required by the fixture is calculated. Generally speaking, the dynamic load capacity should consider a certain safety factor, usually 1.2-1.5 times the static load capacity to ensure the safety and stability of the fixture during dynamic operation.

III. Compatibility requirements

Mechanical interface compatibility

The mounting interface of the fixture must match the end effector interface of the injection manipulator. Different brands and models of injection molding robots may have different interface standards, such as flange size and bolt hole distribution. The size of the mounting flange of the fixture should be accurately matched with that of the end effector of the manipulator, and the position and diameter error of the bolt hole should be controlled within ±0.5mm to ensure that the fixture can be firmly installed on the manipulator.

It is also necessary to consider the mechanical transmission mode compatibility of the interface. For example, if the end effector of the manipulator controls the opening and closing of the fixture through pneumatic or hydraulic transmission, the driving interface of the fixture should be able to connect with the pneumatic or hydraulic system of the manipulator, and the tightness and reliability of the connection should be guaranteed.

Electrical interface compatibility

If the fixture has electrical control elements, such as sensors (used to detect whether the product is successfully grabbed, etc.) or electric drive devices, its electrical interface should be compatible with the control system of the injection molding manipulator. The signal type (such as digital signal or analog signal), voltage level (such as 24V DC or 110AC) and communication protocol (such as Profibus, EtherCAT, etc.) of the electrical interface should be matched with the control system of the manipulator.

The stability and anti-interference ability of signal transmission are also important aspects of electrical interface compatibility. In the complex electromagnetic environment of injection workshop, it is necessary to ensure that the electrical signal between the fixture and the manipulator can be transmitted accurately and stably, so as to avoid the fixture action error or sensor signal distortion caused by electromagnetic interference.

IV. Installation and maintenance requirements

Installation convenience

The installation process of fixture on injection molding robot should be as simple and fast as possible. Adopt standardized installation methods, such as bolt connection, the specifications of bolts should be unified and easy to operate. Tools needed in the installation process should be simple and common, such as wrenches and screwdrivers, which are convenient for installation and disassembly at the production site.

Provide clear installation guide and identification, including the installation direction of fixture, bolt tightening torque and other information. For example, mark the number of bolt holes on the mounting flange of the fixture, and explain the corresponding bolt tightening sequence and torque value in the installation guide. Generally, the bolt tightening torque is controlled within a certain range, for example, the M8 bolt tightening torque is 20-30N・m to ensure the correct installation of the fixture.

Maintenance convenience

Fixture needs regular maintenance during use, so its design should be convenient for maintenance personnel to check, repair and replace parts. The structure of the fixture should be as simple and clear as possible, and the key components (such as the clamping jaw, driving cylinder, etc.) should be easy to disassemble and install.

Sufficient maintenance space shall be reserved, so that when it is necessary to repair or replace the parts inside the fixture, the maintenance personnel can easily approach these parts. For example, the shell of the fixture can be designed to be detachable, and the operating space of the maintenance tool should be considered in the design, so as to avoid the inability to carry out effective maintenance operation due to the narrow space.