A punching device for mold manufacturing

The design of the supporting components, cleaning components and auxiliary components of the mold-making punching device solves the problems of loose fixation of raw materials and debris affecting the drill bit, achieving a more stable and efficient punching effect.

CN119871026BActive Publication Date: 2025-09-05NANTONG LINHUI MASCH EQUIP MFG CO LTD
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Patent Information

Application Number
CN202411978669.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2025-09-05
Estimated Expiration
2044-12-31

AI Technical Summary

Technical Problem

When punching round materials in existing mold manufacturing punching devices, the fixing components are prone to loosening or slipping, causing the material and the drill bit to rotate together, affecting the punching effect, and the debris generated during punching will reduce the service life of the drill bit.

Method used

A punching device for mold manufacturing is designed, which includes a supporting component, a cleaning component and an auxiliary component. Through the synergistic effect of these components, the raw material can be fixed, the vibration frequency can be reduced, the raw material can be prevented from rotating, and the debris in the drill bit can be cleaned, thereby improving the stability and efficiency of punching.

Benefits of technology

It effectively fixes the raw material, reduces the impact of vibration and debris on the drill bit, improves the stability of drilling and the service life of the drill bit, and avoids raw material displacement and drill bit damage.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to the technical field of punching devices, and discloses a punching device for mold manufacturing, wherein the bottom of the annular plate 2 is fixedly connected with an elastic U-shaped plate, and the end of the elastic U-shaped plate away from the annular plate 2 is fixedly connected to the outer shell, and the bottom of the annular plate 2 is fixedly connected with a rotating seat, and the outer wall of the rotating seat is fixedly connected with an elastic plate 1, and the end of the elastic plate 1 away from the rotating seat is fixedly connected with a fixed head, and the outer wall of the fixed head is fixedly connected with a pressure plate 1. By arranging a punching assembly, the movement of the sliding seat can drive the movement of the motor and the drill bit, and before the drill bit contacts the raw material, it will drive the cleaning assembly to contact the raw material, and the raw material is fixed by the clamping effect of the cleaning assembly and the supporting assembly to prevent the raw material from moving during punching, and by fixing it at a position around the raw material, the vibration frequency generated during punching is reduced, and damage to the drill bit due to excessive vibration is prevented.
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Description

Technical Field

[0001] The present invention relates to the technical field of punching devices, in particular to a punching device for mold manufacturing. Background Art

[0002] A mold is a tool that, under the action of external force, makes the blank become a part of a specific shape and size. It is widely used in blanking, die forging, cold heading, extrusion, powder metallurgy pressing, pressure casting, as well as compression molding or injection molding of engineering plastics, rubber, ceramics and other products.

[0003] The patent application with application number CN202122215268.5 discloses a mold manufacturing punching device, in which a conical groove is provided at the bottom end of the inner groove, and a conical rod is fixed to the bottom end of the threaded insert rod, so that the punching head can be replaced, ensuring convenience in the process of replacing the punching head, while improving the applicability of the device, and the punching head can be replaced in time according to different needs.

[0004] When the above-mentioned equipment is used to drill holes in round raw materials, if the bolts of the existing fixing components are not tightened firmly or the bolts are stripped, the raw material and the drill bit will rotate together, which will make the equipment unable to drill holes in the raw materials. At the same time, the debris generated during drilling will affect the drilling effect. Summary of the Invention

[0005] The object of the present invention is to provide a punching device for mold manufacturing to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution: a mold manufacturing punching device, comprising a base, a mobile platform fixedly connected to the top of the base, a sliding seat slidably connected to the surface of the mobile platform, a support assembly fixedly connected to the top of the base, and further comprising:

[0007] The punching mechanism includes a motor fixedly connected to the inner wall of the sliding seat, the output end of the motor is fixedly connected to the drill bit, and the bottom of the motor is fixedly connected to the cleaning assembly. The purpose of this arrangement is to enable the movement of the sliding seat to drive the movement of the motor and the drill bit by setting the punching mechanism. Before the drill bit contacts the raw material, it will drive the cleaning assembly to contact the raw material. Through the clamping effect of the cleaning assembly and the supporting assembly, the raw material is fixed to avoid movement of the raw material during punching, and by fixing the position around the raw material, the vibration frequency generated during punching is reduced to prevent damage to the drill bit due to excessive vibration.

[0008] The cleaning assembly includes an annular plate three fixedly connected to the bottom of the motor, the bottom of the annular plate three is fixedly connected to a connecting plate one, the end of the connecting plate one away from the annular plate three is fixedly connected to a center plate, and the inner wall of the center plate is slidably connected to a sliding rod one.

[0009] According to the above technical solution, the support assembly includes an outer shell, the bottom of the outer shell is fixedly connected to the base, the inner wall of the outer shell is slidably connected to an annular plate 1, the inner wall of the annular plate 1 is fixedly connected to an annular plate 2, the bottom of the annular plate 2 is fixedly connected to an elastic U-shaped plate, and the end of the elastic U-shaped plate away from the annular plate 2 is fixedly connected to the outer shell.

[0010] According to the above technical solution, the bottom of the annular plate 2 is fixedly connected to a rotating seat, the outer wall of the rotating seat is fixedly connected to an elastic plate 1, the end of the elastic plate 1 away from the rotating seat is fixedly connected to a fixed head, and the outer wall of the fixed head is fixedly connected to a pressure plate 1. The purpose of this arrangement is to provide a certain pressure on the raw materials placed on the operating table by setting a support component, so that the raw materials can be fixed under the pressure of the cleaning component to avoid displacement of the raw materials due to the vibration of the electric drill itself during the grinding process, and at the same time, uneven grooves are provided on the surface of the pressure plate 1 to enhance friction and avoid the raw materials from rotating during the punching process, thereby affecting the punching effect.

[0011] According to the above technical solution, the inner wall of the slide rod 1 is slidably connected to the slide rod 2, the end of the slide rod 2 away from the slide rod 1 is fixedly connected to the annular plate 3, the outer wall of the slide rod 2 is sleeved with a spring, the bottom of the spring is fixedly connected to the slide rod 1, and the end of the spring away from the slide rod 1 is fixedly connected to the annular plate 3.

[0012] According to the above technical solution, the end of the sliding rod 1 away from the center plate is fixedly connected to the base plate, the inner wall of the base plate is fixedly connected to the cleaning plate, the side of the base plate away from the sliding rod 1 is fixedly connected to the connecting plate 2, the end of the connecting plate 2 away from the base plate is fixedly connected to the pressure plate 2, the outer wall of the base plate is fixedly connected to the connecting head, and the outer wall of the connecting head is rotatably connected to the auxiliary component, the purpose of this setting is to set up a cleaning component, and through the movement of the cleaning component, the pressure plate 2 is driven to contact with the raw material, thereby improving the fixing effect, and at the same time cleaning the drill bit moving on the inner wall of the cleaning plate to avoid the iron filings in the drill bit affecting the drilling effect.

[0013] According to the above technical solution, the auxiliary component includes a connecting rod, the outer wall of the connecting head is rotatably connected to the connecting rod, the end of the connecting rod away from the connecting head is fixedly connected to a rotating plate, the outer wall of the rotating plate is fixedly connected to an elastic telescopic rod, and the end of the elastic telescopic rod away from the rotating plate is rotatably connected to the connecting plate.

[0014] According to the above technical solution, the top of the connecting rod is fixedly connected to a slider, the outer wall of the slider is slidably connected to a sliding plate, the inner wall of the sliding plate is fixedly connected to an elastic wave plate, the end of the elastic wave plate away from the sliding plate is slidably connected to the slider, and the end of the sliding plate away from the connecting plate one is fixedly connected to elastic plate two. The purpose of this arrangement is to fix the periphery of the raw material by setting auxiliary components, thereby further enhancing the fixing effect of the raw material, and at the same time, by fixing the periphery of the raw material, the force points of the raw material are differentiated to avoid damage to the material due to excessive pressure, and reduce the vibration of the material, thereby improving the drilling effect.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention provides a support component to apply a certain pressure to the raw material placed on the operating table, so that the raw material can be fixed under the pressure of the cleaning component to avoid displacement of the raw material due to the vibration of the electric drill itself during the grinding process. At the same time, uneven grooves are opened on the surface of the pressure plate to enhance friction and prevent the raw material from rotating during the drilling process, thereby affecting the drilling effect.

[0017] 2. The present invention provides a punching mechanism so that the movement of the sliding seat can drive the movement of the motor and the drill bit. Before the drill bit contacts the raw material, it will drive the cleaning component to contact the raw material. Through the clamping effect of the cleaning component and the supporting component, the raw material is fixed to avoid movement of the raw material during punching. In addition, by fixing the position around the raw material, the vibration frequency generated during punching is reduced, preventing the drill bit from being damaged due to excessive vibration.

[0018] 3. The present invention provides a cleaning component, and the movement of the cleaning component drives the second pressure plate to contact the raw material, thereby improving the fixing effect. At the same time, the drill bit moving on the inner wall of the cleaning plate is cleaned to avoid the iron filings in the drill bit from affecting the drilling effect.

[0019] 4. The present invention fixes the periphery of the raw material by setting auxiliary components, thereby further enhancing the fixing effect of the raw material. At the same time, by fixing the periphery of the raw material, the force points of the raw material are differentiated to avoid damage to the material due to excessive pressure, reduce the vibration of the material, and improve the drilling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a cross-sectional view of a support assembly of the present invention;

[0023] Figure 3 is a schematic diagram of the internal parts of the support assembly of the present invention;

[0024] Figure 4 This invention Figure 3 A magnified view of middle A;

[0025] Figure 5 It is a schematic diagram of the punching mechanism of the present invention;

[0026] Figure 6 is a schematic diagram of a cleaning assembly of the present invention;

[0027] Figure 7 This invention Figure 6 Enlarged view of middle B;

[0028] Figure 8 is a schematic diagram of the auxiliary components of the present invention;

[0029] In the figure: 1. Base; 101. Mobile platform; 102. Sliding seat; 11. Support assembly; 111. Housing; 112. Ring plate 1; 113. Ring plate 2; 114. Elastic U-shaped plate; 115. Rotating seat; 116. Elastic plate 1; 117. Fixed head; 118. Pressure plate 1; 2. Punching mechanism; 201. Motor; 202. Drill bit; 21. Cleaning assembly; 211. Ring plate 3; 212. Connecting Connecting plate 1; 213, center plate; 214, slide bar 1; 215, slide bar 2; 216, spring; 217, bottom plate; 218, cleaning plate; 219, connecting plate 2; 2110, pressure plate 2; 2111, connector; 22, auxiliary component; 221, connecting rod; 222, rotating plate; 223, elastic telescopic rod; 224, slider; 225, sliding plate; 226, elastic wave plate; 227, elastic plate 2. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] For example 1, please refer to Figure 1-4The present invention provides a technical solution: a punching device for mold manufacturing, comprising a base 1, a mobile platform 101 fixedly connected to the top of the base 1, a sliding seat 102 slidably connected to the surface of the mobile platform 101, and a support assembly 11 fixedly connected to the top of the base 1. The purpose of this arrangement is to drive the punching mechanism 2 to move up and down through the sliding seat 102 on the mobile platform 101, thereby completing the punching operation;

[0032] The support assembly 11 includes a shell 111, the bottom of the shell 111 is fixedly connected to the base 1, the inner wall of the shell 111 is slidably connected to the annular plate 112, the inner wall of the annular plate 112 is fixedly connected to the annular plate 2 113, the bottom of the annular plate 2 113 is fixedly connected to an elastic U-shaped plate 114, the end of the elastic U-shaped plate 114 away from the annular plate 2 113 is fixedly connected to the shell 111, the bottom of the annular plate 2 113 is fixedly connected to a rotating seat 115, and the outer wall of the rotating seat 115 is fixedly connected to the outer wall of the rotating seat 115. The elastic plate 116 is connected to the end of the elastic plate 116 away from the rotating seat 115, and the fixed head 117 is fixedly connected to the outer wall of the fixed head 117. The purpose of this arrangement is that after the pressure plate 118 comes into contact with the raw material, the gravity of the raw material will drive the raw material plate 118 to move downward, so that the elastic plate 116 connected to the pressure plate 118 will be deformed due to the movement of the pressure plate 118, and the relative distance between the two ends of the deformed elastic plate 116 will be reduced. The distance between the raw material and the pressure plate 118 becomes shorter, which increases its own elastic potential energy. The increased elastic potential energy will react on the pressure plate 118 and be applied to the bottom of the raw material, thereby increasing the pressure between the raw material and the pressure plate 118, thereby improving the fixing effect. At the same time, by providing multiple patterns on the surface of the pressure plate 118, the raw material is prevented from rotating with the drill bit during drilling, thereby improving the drilling effect. When the raw material is placed on the component, the pressure plate 118 will drop first. When the upper surface of the pressure plate 118 and the upper surface of the annular plate 1 are on the same horizontal plane, the annular plate 112 will be driven to move downward along the inner wall of the shell 111. The downward moving annular plate 112 also moves downward with the annular plate 2 113, and then the elastic U-shaped plate 114 is deformed by the extrusion of the annular plate 2. The elastic U-shaped plate 114 converts the elastic force generated by the deformation into pressure to fix the periphery of the raw material through the clamping effect of the annular plate 112 and the placement component, thereby preventing the raw material from moving and improving the stability of the drilling.

[0033] The difference between the second embodiment and the first embodiment is that: Figure 5-Figure 8As shown, the punching mechanism 2 includes a motor 201 fixedly connected to the inner wall of the sliding seat 102, the output end of the motor 201 is fixedly connected to the drill bit 202, and the bottom of the motor 201 is fixedly connected to the cleaning component 21. The purpose of this arrangement is to drive the sliding seat 102 to move through the mobile platform 101, so that the motor 201 and the drill bit 202 also move. Before the drill bit 202 contacts the raw material, the cleaning component 21 on the motor 201 will first contact the raw material, so that when the device punches the raw material, it only needs to change the height of the electric drill to complete the fixation, and there is no need to fix the raw material by rotating multiple bolts.

[0034] The cleaning component 21 includes an annular plate three 211, the top of the annular plate three 211 is fixedly connected to the motor 201, the bottom of the annular plate three 211 is fixedly connected to a connecting plate one 212, the end of the connecting plate one 212 away from the annular plate three 211 is fixedly connected to a center plate 213, the inner wall of the center plate 213 is slidably connected to a slide rod one 214, the inner wall of the slide rod one 214 is slidably connected to a slide rod two 215, the end of the slide rod two 215 away from the slide rod one 214 is fixedly connected to the annular plate three 211, and the outer wall of the slide rod two 215 is provided with a spring 216. The purpose of setting the spring 216 is to facilitate the reset of the component under the action of the elastic force of the spring 216. The bottom of the spring 216 is fixedly connected to the slide rod 1 214, and the end of the spring 216 away from the slide rod 1 214 is fixedly connected to the annular plate 3 211. The end of the slide rod 1 214 away from the center plate 213 is fixedly connected to the bottom plate 217. The inner wall of the bottom plate 217 is fixedly connected to the cleaning plate 218. The side of the bottom plate 217 away from the slide rod 1 214 is fixedly connected to the connecting plate 219. The end of the connecting plate 219 away from the bottom plate 217 is fixedly connected to the pressure plate 2110. The outer wall of the bottom plate 217 is fixedly connected to the connecting head 2111. The outer wall of the connecting head 2111 is rotatably connected to the auxiliary component 22. When the punching operation is required, the sliding seat drives The motor 201 moves downward, and the movement of the motor 201 drives the entire cleaning assembly 21 to move downward together. When the pressure plate 2110 contacts the raw material, the pressure plate 2110 no longer moves, while the connecting plate 1 212 and the center plate 213 continue to move downward along the trajectory of the slide bar 1 214, and then generate linkage with the auxiliary assembly 22. During the movement of the connecting plate 1 212, the annular plate 3 211 is also driven to move downward together, so that the slide bar 215 connected to the annular plate 3 211 is retracted into the interior of the slide bar 1 214, and at the same time, the relative distance between the annular plate 3 211 and the slide bar 1 214 becomes closer, and then the spring 216 squeezes the two. The deformed spring 216 applies the elastic potential energy generated by the deformation to the pressure plate 2 through the slide bar 1 214. At this time, the pressure plate 2110 exerts pressure from the top of the raw material under the pressure given by the spring 216 and the thrust formed by the downward movement of the sliding seat, and the supporting component provides supporting force from the bottom of the raw material. The raw material is fixed by the clamping of the two forces. At the same time, the debris generated by drilling will first be discharged through the gap between the connecting plate 219, and some debris that has not been discharged will be discharged from the gap on the outer surface of the cleaning plate 218 under the centrifugal force of the drill bit, so as to prevent the debris from affecting the drilling effect and at the same time prevent the debris from remaining on the drill bit and causing damage to the drill bit.

[0035] The auxiliary component 22 includes a connecting rod 221, the outer wall of the connecting head 2111 is rotatably connected to the connecting rod 221, and the end of the connecting rod 221 away from the connecting head 2111 is fixedly connected to the rotating plate 222, the outer wall of the rotating plate 222 is fixedly connected to the elastic telescopic rod 223, and the end of the elastic telescopic rod 223 away from the rotating plate 222 is rotatably connected to the connecting plate 1 212, the top of the connecting rod 221 is fixedly connected to a slider 224, the outer wall of the slider 224 is slidably connected to the sliding plate 225, the inner wall of the sliding plate 225 is fixedly connected to an elastic wave plate 226, the end of the elastic wave plate 226 away from the sliding plate 225 is slidably connected to the slider 224, and the end of the sliding plate 225 away from the connecting plate 1 212 is fixedly connected to the elastic plate 227. When the connecting plate 1 212 moves downward along the sliding rod 1 214, the elastic telescopic rod 223 is driven to move downward together, and the elastic telescopic rod 2 The downward movement of 23 will drive the connecting rod 1 221 to rotate outward with the bottom connection as the center of the circle. The rotated connecting rod 1 221 will make the sliding plate 225 contact the bottom and the raw material. After the sliding plate 225 contacts the bottom and the raw material, the connecting plate 1 212 will continue to move downward, so that the relative distance between the bottom of the sliding plate 225 and the slider 224 becomes closer, and then the elastic wave plate 226 is deformed under the squeezing of the two. The deformed elastic wave plate 226 will convert the elastic potential energy generated by the deformation into pressure applied to the bottom of the sliding plate 225 and then transferred to the surface of the raw material to enhance the fixing effect. In addition, through the easy deformation characteristics of the elastic plate 227, the force generated when the sliding plate 225 contacts the raw material is buffered to avoid damage to the surface of the original part due to excessive pressure, and the contact area between the bottom of the auxiliary component and the raw material is increased to prevent the raw material from rotating under the rotation of the drill bit, thereby improving the drilling effect. It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A punching device for mold manufacturing, comprising a base (1), a mobile platform (101) fixedly connected to the top of the base (1), a sliding seat (102) slidably connected to the surface of the mobile platform (101), and a support assembly (11) fixedly connected to the top of the base (1), characterized in that: Also includes: The punching mechanism (2) comprises a motor (201) fixedly connected to the inner wall of the sliding seat (102), a drill bit (202) fixedly connected to the output end of the motor (201), and a cleaning assembly (21) fixedly connected to the bottom of the motor (201); A cleaning assembly (21) includes an annular plate three (211) fixedly connected to the bottom of the motor (201), wherein the bottom of the annular plate three (211) is fixedly connected to a connecting plate one (212), an end of the connecting plate one (212) away from the annular plate three (211) is fixedly connected to a center plate (213), and an inner wall of the center plate (213) is slidably connected to a slide rod one (214); The support assembly (11) includes a shell (111), the bottom of the shell (111) is fixedly connected to the base (1), the inner wall of the shell (111) is slidably connected to an annular plate 1 (112), the inner wall of the annular plate 1 (112) is fixedly connected to an annular plate 2 (113), the bottom of the annular plate 2 (113) is fixedly connected to an elastic U-shaped plate (114), one end of the elastic U-shaped plate (114) away from the annular plate 2 (113) is fixedly connected to the shell (111), the bottom of the annular plate 2 (113) is fixedly connected to a rotating seat (115), the outer wall of the rotating seat (115) is fixedly connected to an elastic plate 1 (116), the end of the elastic plate 1 (116) away from the rotating seat (115) is fixedly connected to a fixed head (117), and the outer wall of the fixed head (117) is fixedly connected to a pressure plate 1 (118).

2. A punching device for mold manufacturing according to claim 1, characterized in that: The inner wall of the slide bar 1 (214) is slidably connected to the slide bar 2 (215), and the end of the slide bar 2 (215) away from the slide bar 1 (214) is fixedly connected to the annular plate 3 (211). The outer wall of the slide bar 2 (215) is provided with a spring (216), and the bottom of the spring (216) is fixedly connected to the slide bar 1 (214), and the end of the spring (216) away from the slide bar 1 (214) is fixedly connected to the annular plate 3 (211).

3. A punching device for mold manufacturing according to claim 2, characterized in that: The end of the slide rod 1 (214) away from the center plate (213) is fixedly connected to the bottom plate (217), the inner wall of the bottom plate (217) is fixedly connected to the cleaning plate (218), the side of the bottom plate (217) away from the slide rod 1 (214) is fixedly connected to the connecting plate 2 (219), the end of the connecting plate 2 (219) away from the bottom plate (217) is fixedly connected to the pressure plate 2 (2110), the outer wall of the bottom plate (217) is fixedly connected to the connecting head (2111), and the outer wall of the connecting head (2111) is rotatably connected to the auxiliary component (22).

4. A punching device for mold manufacturing according to claim 3, characterized in that: The auxiliary component (22) includes a connecting rod (221), an outer wall of the connecting head (2111) is rotatably connected to the connecting rod (221), an end of the connecting rod (221) away from the connecting head (2111) is fixedly connected to a rotating plate (222), an outer wall of the rotating plate (222) is fixedly connected to an elastic telescopic rod (223), and an end of the elastic telescopic rod (223) away from the rotating plate (222) is rotatably connected to the first connecting plate (212).

5. A punching device for mold manufacturing according to claim 4, characterized in that: The top of the connecting rod (221) is fixedly connected to a slider (224), the outer wall of the slider (224) is slidably connected to a sliding plate (225), the inner wall of the sliding plate (225) is fixedly connected to an elastic wave plate (226), one end of the elastic wave plate (226) away from the sliding plate (225) is slidably connected to the slider (224), and one end of the sliding plate (225) away from the connecting plate 1 (212) is fixedly connected to the elastic plate 2 (227).

Citation Information

Patent Citations

  • Punching device for mold manufacturing

    CN215698182U

  • Batch drilling device for shaft part production and machining

    CN114589331A

  • Machining clamping device facilitating longitudinal adjustment of workpiece

    CN218017218U