A punch pin outer circle polishing clamp

Abstract

The utility model discloses a kind of punch pin outer circle polishing clamps, including base, chuck mechanism and abutting mechanism, chuck mechanism is by rotary drive device, rotary seat and chuck, chuck is fixed quickly with rotary seat by locating pin and strong magnet, its tool insertion hole is equipped with sink hole and elastic rubber pad, for stabilizing clamping the punch pin workpiece of carrying support head, and rotating punch pin is driven by friction transmission. Abutting mechanism includes horizontal movement drive device and abutting rod assembly, and abutting rod assembly is realized coaxial positioning of punch pin by elastic extension and contraction. Controller coordinates rotary drive and horizontal movement drive, realizes automatic clamping and polishing. The clamp simple structure, clamping is convenient, can replace punch pin quickly and keep stable rotation.

Description

Technical Field

[0001] This utility model relates to the field of fixtures for external cylindrical grinding machines for pipe fittings, and in particular to a fixture for grinding the external cylindrical shape of a center pin. Background Technology

[0002] As a key component in a mold that directly contacts and ejects plastic parts, the ejector pin needs to form a high-precision sliding fit with the mold's "ejector hole." External grinding is precisely to achieve this fit and avoid various problems during use. In the machining of mold ejector pins, external grinding is one of the core processes, its fundamental purpose being to address the core requirements of ejector pin "functional reliability," "lifespan," and "product quality."

[0003] In the prior art, the ejector chuck for grinding machines usually has a rotary-driven double-positioning structure, including a rotary chuck assembly with a power source and a rotating abutment head in a coaxial position. The rotary chuck assembly includes a chuck, the bottom of the ejector pin is clamped in the chuck, and the bottom of the ejector pin is engaged with the abutment head through its pin opening, so that the ejector pin can perform external cylindrical grinding with the grinding disc in the grinding machine in a rotary tooling state.

[0004] However, this type of ejector pin outer diameter grinding fixture has drawbacks: after each ejector pin outer diameter grinding process is completed, the chuck needs to be released to release the ejector pin, and then the next ejector pin to be processed needs to be clamped in the chuck. Then, the ejector head is manually pushed to contact the pin head to complete the tooling. This changeover process is cumbersome and time-consuming, resulting in a longer ejector pin outer diameter grinding cycle and lower processing efficiency. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a grinding fixture for the outer circle of an ejector pin to solve the above problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a grinding fixture for the outer diameter of a pin, comprising a base, a chuck mechanism, and a backing mechanism. The chuck mechanism and the backing mechanism are located on both sides of the base and are engaged with the pin clamping mechanism. The chuck mechanism includes a rotary drive device, a rotary seat, and a chuck. The rotary seat is rotatably mounted on the base, and the rotary drive device is drivenly connected to the rotary seat. The chuck is coaxially mounted on the end face of the rotary seat. The end face of the rotary seat is provided with at least two positioning pins and multiple assembly recesses, each assembly recess being spaced apart along the circumferential direction. A strong magnet is fixedly embedded inside each assembly recess. A contact portion is formed at the center of the end face of the rotary seat, and the surface of the contact portion is formed with a textured surface structure to improve friction. The chuck is made of magnetic metal, and at least two positioning pin holes are opened on the inner side of the chuck, each positioning pin hole being engaged with a corresponding positioning pin. A chuck is opened at the center of the chuck. A tooling insertion hole runs through the front and rear sides of the chuck for inserting the ejector pin workpiece to be ground. The end of the ejector pin workpiece has a support head. The inner opening of the tooling insertion hole has a countersunk hole that matches the support head. The chuck and the ejector pin workpiece are pre-tooled together. The ejector pin workpiece is inserted into the tooling insertion hole from the inside out, and its support head is embedded and secured in the countersunk hole. A filling space is left near the opening of the countersunk hole, with the end face of the support head as the boundary. A tooling device is embedded and installed within this filling space. The elastic rubber pad has its outer side protruding from the inner side of the chuck. When the chuck is installed on the rotary seat, each positioning pin hole of the chuck is respectively fitted with the corresponding positioning pin. The chuck is magnetically attracted to the end face of the rotary seat through magnetic attraction with each strong magnet. The textured surface of the contact part contacts the outer side of the rubber pad, and the inner side of the rubber pad rubs against the end face of the ejector pin support, so as to achieve frictional connection between the contact part and the ejector pin support, thereby driving the ejector pin to rotate.

[0007] In a further technical solution, when the chuck and the ejector pin workpiece are pre-tooled together, double-sided tape is attached to the inner side of the rubber pad. The rubber pad is then bonded to the end face of the ejector pin workpiece's support head via the double-sided tape to improve the static friction between the two.

[0008] In a further technical solution, a mounting seat is provided on the first side of the base, and a rotating seat is rotatably mounted on the mounting seat; a transverse drive device is provided on the second side of the base, the transverse drive device having a movable seat and the transverse drive device, the movable seat being movably mounted on the base and arranged in a straight line, the transverse drive device being drively connected to the movable seat; the abutting mechanism includes an abutting rod assembly, the abutting rod assembly being mounted on the movable seat, the abutting rod assembly and the chuck assembly being on the same axis and being engaged with the ejector pin clamping mechanism, the grinding fixture also includes a controller, the controller being electrically connected to the rotary drive device and the transverse drive device respectively.

[0009] In a further technical solution, the mounting base is equipped with a bearing, the inner ring of the bearing is equipped with a drive shaft, and the rotary drive device is connected to the drive shaft; a coupling sleeve is provided at the center of the rear side of the rotating base, and the side of the coupling sleeve is provided with multiple locking holes that penetrate inward and outward in the radial direction, and each locking hole is threaded with a locking bolt; the coupling sleeve is fitted onto the drive shaft and is fastened by the locking bolt.

[0010] In a further technical solution, the rotary drive device includes a reducer and a rotary drive motor. The reducer is located outside the mounting base and is fixedly mounted on the base. The reducer has an output shaft and an input shaft, and the output shaft is connected to the transmission shaft through a coupling. The rotary drive motor is fixedly mounted outside the reducer and connected to the input shaft of the reducer. The rotary drive motor is electrically connected to the controller.

[0011] In a further technical solution, the transverse drive device includes two optical rod seats, which are respectively disposed on the surface of the base, forming a moving section between them. Two optical rod units are connected between the two optical rod seats. Guide holes are opened on both sides of the movable seat, and the corresponding optical rod units are slidably sleeved through the guide holes. A transverse drive screw is rotatably installed between the two optical rod seats. The transverse drive screw is parallel to the optical rod unit. A transverse drive motor is fixedly installed in one of the optical rod seats. A gear set structure is provided inside this optical rod seat. The output shaft of the transverse drive motor is connected to the transverse drive screw through the gear set structure.

[0012] In a further technical solution, the top of the movable seat is provided with a lifting seat, the front side of the lifting seat is provided with a bearing seat, the end face of the bearing seat is provided with a bearing, and the push rod assembly is rotatably mounted on the end face of the bearing seat through the bearing.

[0013] In a further technical solution, the abutment assembly includes an abutment sleeve and a abutment unit. The abutment sleeve is connected to the bearing of the bearing housing. The front side of the abutment sleeve is provided with a cavity, the abutment unit is movably inserted into the cavity, and a compression spring is provided between the abutment unit and the cavity to realize the elastic expansion and contraction cooperation between the abutment unit and the abutment sleeve.

[0014] In a further technical solution, the outer diameter of the abutment unit is larger than the outer diameter of the ejector pin workpiece to be ground, and the end of the abutment unit is chamfered to abut against the opening of the ejector pin workpiece to achieve coaxial positioning.

[0015] In a further technical solution, the base is provided with multiple grinding machine locking clamps on its periphery for fixed installation on the grinding machine.

[0016] The advantages of this invention compared to the prior art after adopting the above structure are:

[0017] 1. The chuck and rotating seat are quickly installed by the insertion of positioning pins and the magnetic attraction of strong magnets. The chuck and ejector pin workpiece can be pre-tooled. The ejector pin workpiece is inserted into the tooling insertion hole from the inside out, and the support head is embedded and locked in the bottom hole. The operation is simple and does not require the complicated chuck release and re-clamping operation every time the ejector pin is replaced, as is the case with existing technology. It can significantly shorten the clamping time of a single ejector pin.

[0018] 2. The chuck and ejector pin workpiece can be pre-tooled together, and two chucks can be prepared for alternating use. The pre-tooling operation of the chuck and ejector pin workpiece can be carried out during the ejector pin grinding. After grinding is completed, the pre-tooled ejector pin and chuck can be magnetically installed on the rotary seat to complete the quick changeover, further shorten the changeover cycle and improve production efficiency.

[0019] 3. The textured surface of the contact part contacts the outer side of the rubber pad, and the inner side of the rubber pad rubs against the end face of the ejector pin workpiece. Through the frictional connection between the contact part and the ejector pin workpiece, the ejector pin is driven to rotate, ensuring that the ejector pin can rotate stably during the grinding process. This helps to improve the grinding quality and uniformity of the outer circle of the ejector pin and ensures the smooth completion of the grinding process.

[0020] 4. The outer side of the rubber pad protrudes from the inner side of the chuck. When the chuck and the ejector pin workpiece are pre-tooled together, the inner side of the rubber pad can be bonded to the end face of the ejector pin workpiece support head with double-sided tape. This increases the static friction between the rubber pad and the ejector pin workpiece support head, further ensuring the stability of the ejector pin rotation and thus improving the grinding effect.

[0021] 5. The grinding fixture is equipped with a controller, which is electrically connected to the rotary drive and the transverse drive respectively. This enables automated control of the rotary and transverse movements, improving the accuracy and consistency of the production process, reducing manual intervention, lowering labor intensity, and facilitating integration with automated production lines to improve overall production efficiency. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of the grinding fixture in this utility model.

[0025] Figure 3 This is a schematic diagram of the clamping and fitting of the abutting mechanism in this utility model. Detailed Implementation

[0026] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0027] like Figures 1 to 3 As shown, a grinding fixture for the outer diameter of an ejector pin includes a base 1, a chuck 21 mechanism 2, and a supporting mechanism 3. The chuck 21 mechanism 2 and the supporting mechanism 3 are located on both sides of the base 1 and are used for ejector pin clamping. The chuck 21 mechanism 2 includes a rotary drive device, a rotary seat 22, and a chuck 21. The rotary seat 22 is rotatably mounted on the base 1, and the rotary drive device is drivenly connected to the rotary seat 22. The chuck 21 is coaxially mounted on the end face of the rotary seat 22. The end face of the rotary seat 22 is provided with at least two positioning pins 222 and multiple mounting recesses. The assembly recesses are spaced apart along the circumference, and a strong magnet 223 is fixedly embedded inside each assembly recess. A contact portion 224 is formed at the center of the end face of the rotating seat 22, and the surface of the contact portion 224 is formed with a textured surface structure to improve friction. The chuck 21 is made of magnetically conductive metal, and at least two positioning pin holes 213 are opened on the inner side of the chuck 21. Each positioning pin hole 213 is respectively engaged with a corresponding positioning pin 222. A tooling insertion hole 21 is opened at the center of the chuck 21, penetrating the front and rear sides of the chuck 21. 1. A fixture for inserting a ejector pin workpiece 9 to be ground. The end of the ejector pin workpiece 9 is provided with a support head 91. The inner opening of the fixture insertion hole 211 is provided with a countersunk hole 212 that matches the support head 91. The clamp 21 and the ejector pin workpiece 9 are pre-fitted. The ejector pin workpiece 9 is inserted into the fixture insertion hole 211 from the inside out, and its support head 91 is embedded and locked in the countersunk hole 212. With the end face of the support head 91 as the boundary, a filling space is left near the opening of the countersunk hole 212. An elastic rubber pad 8 is embedded and installed in the filling space. The rubber pad 8... The outer side protrudes from the inner side of the chuck 21. When the chuck 21 is installed on the rotary seat 22, each positioning pin hole 213 of the chuck 21 is respectively sleeved with the corresponding positioning pin 222. The chuck 21 is magnetically attracted to the end face of the rotary seat 22 through magnetic attraction with each strong magnet 223. The textured surface of the contact part 224 contacts the outer side of the rubber pad 8. The inner side of the rubber pad 8 is in frictional engagement with the end face of the support head 91 of the ejector pin workpiece 9, so as to realize the frictional connection between the contact part 224 and the support head 91 of the ejector pin workpiece 9, thereby driving the ejector pin to rotate.

[0028] The chuck 21 and the ejector pin workpiece 9 can be pre-tooled together, and two chucks 21 can be prepared for alternating use. The pre-tooling operation of the chuck 21 and the ejector pin workpiece 9 can be performed during the ejector pin grinding. After grinding is completed, the pre-tooled ejector pin and chuck 21 can be magnetically installed on the rotary seat 22 to complete the quick changeover, further shorten the changeover cycle and improve production efficiency.

[0029] The chuck 21 and the rotating seat 22 are quickly installed through the insertion and engagement of the positioning pin 222 and the magnetic attraction of the strong magnet 223. The chuck 21 and the ejector pin workpiece 9 can be pre-tooled together. The ejector pin workpiece 9 is inserted into the tooling insertion hole 211 from the inside out, and the support head 91 is embedded and locked in the bottom hole 212. The operation is simple and does not require the complicated chuck release and re-clamping operation every time the ejector pin is replaced, as is the case with the existing technology. It can significantly shorten the clamping time of a single ejector pin.

[0030] The textured surface of the contact part 224 contacts the outer side of the rubber pad 8, and the inner side of the rubber pad 8 frictionally engages with the end face of the support head 91 of the ejector pin workpiece 9. Through the frictional connection between the contact part 224 and the support head 91 of the ejector pin workpiece 9, the ejector pin is driven to rotate and engage, ensuring that the ejector pin can rotate stably during the grinding process. This helps to improve the grinding quality and uniformity of the outer circle of the ejector pin and ensures that the grinding process is completed smoothly.

[0031] Research and analysis show that the grinding reaction force between the grinding disc and the ejector pin is mainly generated by the grinding force of the grinding disc on the ejector pin. In general die ejector pin outer diameter grinding, the grinding force of the grinding disc is relatively small. This is because ejector pins are usually small in size and have a small grinding allowance, and the tangential grinding reaction force between the grinding disc and the ejector pin is generally between a few Newtons and tens of Newtons. For example, for ejector pins with a small diameter, such as 3-10mm, and a shallow grinding allowance, such as 0.01-0.1mm, the grinding reaction force has been measured to be around 5-30N. However, the friction drive structure in this embodiment can provide a maximum tangential force of 80N, which can drive the ejector pin to rotate over a certain resistance.

[0032] Therefore, the inner diameter of the tooling insertion hole 211 in this embodiment is no greater than 10mm. That is, the outer diameter of the ejector pin workpiece 9 is also no greater than 10mm. This is to ensure that the ejector pin will not slip or detach during the grinding process.

[0033] Specifically, when the chuck 21 and the ejector pin workpiece 9 are pre-tooled together, double-sided adhesive tape is attached to the inner side of the rubber pad 8. The rubber pad 8 is adhered to the end face of the support head 91 of the ejector pin workpiece 9 through the double-sided adhesive tape to increase the static friction between the two. This further increases the static friction between the chuck 21 and the ejector pin workpiece 9, preventing slippage during grinding. The outer side of the rubber pad 8 protrudes from the inner side of the chuck 21, and when the chuck 21 and the ejector pin workpiece 9 are pre-tooled together, the inner side of the rubber pad 8 can be adhered to the end face of the support head 91 of the ejector pin workpiece 9 through double-sided adhesive tape, increasing the static friction between the rubber pad 8 and the support head 91 of the ejector pin workpiece 9, further ensuring the stability of the ejector pin rotation, and thus improving the grinding effect.

[0034] Specifically, the first side of the base 1 is provided with a mounting seat 11, and the rotating seat 22 is rotatably mounted on the mounting seat 11; the second side of the base 1 is provided with a transverse drive device, which has a movable seat 35 and a transverse drive device. The movable seat 35 is movably mounted on the base 1 and is arranged in a straight line. The transverse drive device is connected to the movable seat 35 in a transmission manner; the abutting mechanism 3 includes an abutting rod assembly, which is mounted on the movable seat 35. The abutting rod assembly and the chuck 21 assembly are on the same axis and are engaged with the ejector pin clamping mechanism. The grinding fixture also includes a controller 4, which is electrically connected to the rotary drive device and the transverse drive device respectively.

[0035] Specifically, the mounting base 11 is provided with a bearing, and the inner ring of the bearing is provided with a drive shaft. The rotation drive device is connected to the drive shaft. A coupling sleeve 221 is provided at the center of the rear side of the rotating base 22. The side of the coupling sleeve 221 is provided with multiple locking holes that penetrate inward and outward in the radial direction. Each locking hole is threaded with a locking bolt. The coupling sleeve 221 is sleeved on the drive shaft and is fastened by the locking bolt.

[0036] Specifically, the rotary drive device includes a reducer 23 and a rotary drive motor 24. The reducer 23 is located outside the mounting base 11 and is fixedly mounted on the base 1. The reducer 23 has an output shaft and an input shaft, and the output shaft is connected to the transmission shaft through a coupling. The rotary drive motor 24 is fixedly mounted outside the reducer 23 and connected to the input shaft of the reducer 23. The rotary drive motor 24 is electrically connected to the controller 4.

[0037] Specifically, the transverse drive device includes two guide rod seats 30, which are respectively disposed on the surface of the base 1, forming a moving section between them. Two guide rod units 301 are connected between the two guide rod seats 30. Guide holes are provided on both sides of the movable seat 35, and the movable seat 35 is slidably sleeved onto the corresponding guide rod unit 301 through the guide holes. A transverse drive screw 302 is rotatably mounted between the two guide rod seats 30, and the transverse drive screw 302 is parallel to the guide rod unit 301. A transverse drive motor 303 is fixedly mounted on one of the guide rod seats 30. The internal structure of this guide rod seat 30 is provided with a gear set structure, and the output shaft of the transverse drive motor 303 is connected to the transverse drive screw 302 through the gear set structure. The transverse drive motor 303 is electrically connected to the controller 4.

[0038] The grinding fixture is equipped with controller 4, which is electrically connected to the rotary drive and the transverse drive respectively. This enables automated control of the rotary and transverse movements, improving the accuracy and consistency of the production process, reducing manual intervention, lowering labor intensity, and facilitating integration with automated production lines to improve overall production efficiency.

[0039] Specifically, the top of the movable seat 35 is provided with a lifting seat 34, the front side of the lifting seat 34 is provided with a bearing seat 33, the end face of the bearing seat 33 is provided with a bearing, and the push rod assembly is rotatably mounted on the end face of the bearing seat 33 through the bearing.

[0040] Specifically, the abutment assembly includes an abutment sleeve 32 and an abutment unit 31. The abutment sleeve 32 is connected to the bearing of the bearing housing 33. The front side of the abutment sleeve 32 is provided with a cavity, the abutment unit 31 is movably inserted into the cavity, and a compression spring is provided between the abutment unit 31 and the cavity to realize the elastic expansion and contraction cooperation between the abutment unit 31 and the abutment sleeve 32.

[0041] Specifically, the outer diameter of the abutment unit 31 is larger than the outer diameter of the ejector pin workpiece 9 to be ground, and the end of the abutment unit 31 is chamfered to abut against the opening of the ejector pin workpiece 9 to achieve coaxial positioning.

[0042] Specifically, the base 1 has multiple grinding machine locking clamps 10 around its periphery for fixed installation on the grinding machine.

[0043] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A grinding fixture for the outer diameter of an ejector pin, comprising a base, a chuck mechanism, and a backing mechanism, wherein the chuck mechanism and the backing mechanism are respectively located on both sides of the base and are engaged for ejector pin clamping, characterized in that: The chuck mechanism includes a rotary drive, a rotary base, and a chuck. The rotary base is rotatably mounted on a base, the rotary drive is driven to the rotary base, and the chuck is coaxially mounted on the end face of the rotary base. The rotating base has at least two positioning pins and multiple mounting recesses on its end face. Each mounting recess is spaced apart along the circumference and a strong magnet is fixedly embedded inside each mounting recess. A contact part is formed at the center of the end face of the rotating base, and the surface of the contact part is formed with a textured surface structure to improve friction. The chuck is made of magnetic metal. At least two locating pin holes are provided on the inner side of the chuck, each locating pin hole engaging with a corresponding locating pin. A tooling insertion hole, penetrating the front and rear sides of the chuck, is located at the center of the chuck for inserting the workpiece to be ground. The end of the workpiece to be ground has a support head. A countersunk hole matching the support head is provided at the inner opening of the tooling insertion hole. The chuck and the workpiece are pre-tooled together. The workpiece is inserted into the tooling insertion hole from the inside out, and its support head is embedded and secured in the countersunk hole. A filling space is provided near the opening of the countersunk hole, with the end face of the support head as the boundary. An elastic rubber pad is embedded and installed within this filling space, with the outer side of the rubber pad protruding from the inner side of the chuck. When the chuck is installed on the rotary seat, each positioning pin hole of the chuck is respectively fitted with the corresponding positioning pin, and the chuck is magnetically attracted to the end face of the rotary seat through magnetic attraction with each strong magnet. The textured surface of the contact part contacts the outer side of the rubber pad, and the inner side of the rubber pad rubs against the end face of the ejector pin support, so as to achieve frictional connection between the contact part and the ejector pin support, thereby driving the ejector pin to rotate.

2. The grinding fixture for the outer diameter of an ejector pin according to claim 1, characterized in that: When the chuck and the ejector pin workpiece are pre-tooled together, double-sided tape is attached to the inner side of the rubber pad. The rubber pad is bonded to the end face of the ejector pin workpiece support by the double-sided tape to improve the static friction between the two.

3. The grinding fixture for the outer diameter of an ejector pin according to claim 1, characterized in that: The base is provided with a mounting seat on its first side, and the rotating seat is rotatably mounted on the mounting seat; A transverse drive device is provided on the second side of the base. The transverse drive device has a movable seat and a transverse drive mechanism. The movable seat is movably mounted on the base and is arranged in a straight line. The transverse drive mechanism is drivenly connected to the movable seat. The abutting mechanism includes an abutting rod assembly, which is mounted on the movable seat. The abutting rod assembly and the chuck assembly are on the same axis and are engaged with a pin clamping mechanism. The grinding fixture also includes a controller, which is electrically connected to the rotary drive device and the transverse drive device respectively.

4. A grinding fixture for the outer diameter of an ejector pin according to claim 3, characterized in that: The mounting base is equipped with a bearing, and the inner ring of the bearing is equipped with a drive shaft. The rotary drive device is connected to the drive shaft. A coupling sleeve is provided at the center of the rear side of the rotary base. The side of the coupling sleeve has multiple locking holes that extend radially inward and outward. Each locking hole is threaded with a locking bolt. The coupling sleeve is fitted onto the drive shaft and is fastened by the locking bolt.

5. A grinding fixture for the outer diameter of an ejector pin according to claim 4, characterized in that: The rotary drive device includes a reducer and a rotary drive motor. The reducer is located on the outside of the mounting base and is fixedly installed on the base. The reducer has an output shaft and an input shaft. The output shaft is connected to the transmission shaft through a coupling. The rotary drive motor is fixedly installed on the outside of the reducer and connected to the input shaft of the reducer. The rotary drive motor is electrically connected to the controller.

6. A grinding fixture for the outer diameter of an ejector pin according to claim 5, characterized in that: The transverse drive device includes two optical rod seats, which are respectively disposed on the surface of the base, forming a moving area between them. Two optical rod units are connected between the two optical rod seats. Guide holes are opened on both sides of the movable seat, and the seat is slidably sleeved onto the corresponding optical rod unit through the guide holes. A transverse drive screw is rotatably mounted between the two optical rod seats. The transverse drive screw is parallel to the optical rod unit. A transverse drive motor is fixedly mounted on one of the optical rod seats. The optical rod seat has a gear set structure inside. The output shaft of the transverse drive motor is connected to the transverse drive screw through the gear set structure.

7. A grinding fixture for the outer diameter of an ejector pin according to claim 6, characterized in that: The top of the movable seat is provided with a lifting seat, the front side of the lifting seat is provided with a bearing seat, and the end face of the bearing seat is provided with a bearing. The push rod assembly is rotatably mounted on the end face of the bearing seat through the bearing.

8. A grinding fixture for the outer diameter of an ejector pin according to claim 7, characterized in that: The abutment assembly includes an abutment sleeve and an abutment unit. The abutment sleeve is connected to the bearing of the bearing housing. The front side of the abutment sleeve is provided with a cavity, and the abutment unit is movably inserted into the cavity. A compression spring is provided between the abutment unit and the cavity to achieve elastic expansion and contraction between the abutment unit and the abutment sleeve.

9. A grinding fixture for the outer diameter of an ejector pin according to claim 8, characterized in that: The outer diameter of the abutment unit is larger than the outer diameter of the ejector pin workpiece to be ground. The end of the abutment unit is chamfered to abut against the opening of the ejector pin workpiece and achieve coaxial positioning.

10. A grinding fixture for the outer diameter of an ejector pin according to claim 1, characterized in that: The base is provided with multiple grinding machine locking clamps on its periphery for fixed installation on the grinding machine.

Images