Injection molding part hole site detection device

By designing an injection molded part hole position detection device including a small stepper motor, tooth belt and adjustment device, the problem of difficulty in angular deflection and multiple sets of capture detection of injection molded part hole position detection device is solved, and high accuracy detection of injection molded part hole position and rapid clamping limit of multiple sets of injection molded parts are achieved.

CN119665816AInactive Publication Date: 2025-03-21YINGSUO (JIANGSU) AUTO PARTS TECH CO LTD
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Patent Information

Application Number
CN202411856848.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2025-03-21
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The hole position detection device of some injection molded parts is not convenient for angular deflection of the placement position of the injection molded parts. The visual detection device has poor capture and detection effect on multiple sets of injection molded parts at the same fixed position, and is not convenient for quick clamping and limiting of multiple sets of injection molded parts.

Method used

A hole position detection device for injection molded parts is designed, including a base frame and a material carrier. The base frame consists of a small stepper motor, sleeve, snap ring, slot rod, ring buckle plate, shaft cylinder, tooth belt, etc. The small stepper motor drives the rotating of the slot rod and ring buckle plate, and combines the meshing structure of the tooth belt to realize the angular deflection of the injection molded parts; an adjustment device and a clamping device are provided in the material carrier, and the rapid clamping limit of the injection molded parts is achieved through components such as threaded rod, limiting plate, rubber pad and buffer spring.

Benefits of technology

This device can effectively deflect the position of the injection molded parts angularly, improve the accuracy of the visual detection device to capture and detect the hole position of the injection molded parts by the visual inspection device, and facilitate the quick clamping limit of multiple groups of injection molded parts.

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Abstract

The invention relates to the technical field of injection molding part detection, in particular to an injection molding part hole site detection device, which comprises a base frame and a material loading part, and is characterized in that a small stepping motor is started to drive a first groove rod and a first ring buckle plate to rotate; a shaft barrel, a second groove rod, a second buckle plate, a connecting block, a handle rod and a positioning block are of an integrated carrier structure and can drive the integrated carrier structure to rotate around the vertical central axis of a sleeve and a first clamping ring, a shaft rotating piece drives a threaded rod to rotate, a rubber pad slides downwards in an inner area of a square barrel, a disc and the rubber pad extrude filling oil downwards, and the filling oil is filled in the square barrel. By means of the arrangement, rapid clamping and limiting can be conveniently carried out on multiple sets of injection molding parts, angle deflection can be carried out on the placement positions of the injection molding parts, multiple sets of hole sites of the injection molding parts can be conveniently captured and detected by a visual detection device, and the detection accuracy of the hole sites of the injection molding parts is improved.
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Description

Technical Field

[0001] The invention relates to the technical field of injection molded part detection, in particular to an injection molded part hole position detection device. Background Art

[0002] After the automobile injection molding parts are produced and processed, they still need to be punched. However, during the punching process, the holes are often not punched through or missed. Therefore, it is necessary to detect the hole positions. Take the visual inspection of the injection molding hole position detection device as an example.

[0003] Some injection molded part hole position detection devices are not convenient for angular deflection of the placement position of the injection molded parts. The visual inspection device has poor effect on capturing and detecting multiple groups of injection molded part holes at the same fixed position, and is not convenient for quickly clamping and limiting multiple groups of injection molded parts. Therefore, a device for detecting the hole position of an injection molded part is proposed to address the above problems. Summary of the invention

[0004] The object of the present invention is to provide an injection molded part hole position detection device, which is used to solve the problem that some injection molded part hole position detection devices are not convenient for angular deflection of the placement position of the injection molded part, the visual inspection device has poor effect on capturing and detecting multiple groups of injection molded part hole positions at the same fixed position, and is not convenient for quickly clamping and limiting multiple groups of injection molded parts.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device for detecting the hole position of an injection molded part comprises a base frame and a material carrier, wherein the material carrier is arranged on the top of the base frame, and the base frame comprises a base plate, a small stepping motor, a sleeve, a first clamping ring, a first slotted rod, a first buckle plate, a shaft cylinder, a second slotted rod, a second buckle plate, a connecting block, a handle rod, a positioning block and a toothed belt, wherein a small stepping motor and two sleeves are fixedly arranged on the top of the base plate, and the two sleeves are symmetrically arranged at the front and rear sides of the vertical central axis of the small stepping motor, a first clamping ring is fixedly arranged inside the sleeve, a first slotted rod is arranged on the top of the small stepping motor, and the top and bottom of the first slotted rod are symmetrically fixedly arranged There are two first buckle plates, the bottom end of the first buckle plate arranged at the bottom is fixed to the main shaft of the small stepping motor, the inside of the sleeve, the first retaining ring and the shaft tube are rotatably arranged, the top of the shaft tube is provided with a second slot rod, the top and bottom ends of the second slot rod are symmetrically distributed and fixed with second buckle plates, the top of the second buckle plate arranged at the top is fixed with a connecting block, the outside of the connecting block is fixed with a handle rod, the end of the handle rod away from the connecting block is fixed with a positioning block, the bottom end of the second buckle plate arranged at the bottom is fixed with the top of the shaft tube, the outside of the first slot rod is provided with a tooth groove, the outside of the second slot rod is provided with a tooth groove meshing with a toothed belt.

[0007] Preferably, the material carrier comprises a disc body, a cavity shell, an adjusting device and a clamping device, the cavity shell is fixedly provided on the top of the disc body, the adjusting device is fixedly provided on the central top of the cavity shell, and the clamping device is provided inside the circular body of the cavity shell.

[0008] Preferably, the adjusting device comprises a square cylinder, a second clamping ring, an axial rotating member, a threaded rod, a limit plate, a disc, a rubber pad, a connecting cylinder and a buffer spring. A second clamping ring is fixedly arranged inside the top end of the square cylinder. The inside of the top end of the square cylinder and the second clamping ring are rotatably arranged with the axial rotating member. A threaded rod is fixedly arranged at the bottom end of the axial rotating member. Two limit plates are fixedly arranged on the inner wall of the square cylinder. A disc is arranged between the limit plates at the top and the bottom. A rubber pad is fixedly arranged on the outside of the disc. A connecting cylinder is fixedly arranged on the top end of the disc. A buffer spring is fixedly arranged between the top of the disc and the inner wall of the top end of the square cylinder. The bottom end of the square cylinder is fixedly connected to the top of the cavity shell.

[0009] Preferably, the clamping device includes a guide cylinder, a rod, a flexible pad, a rubber ring and a limit ring, the guide cylinder is provided with a rod, a flexible pad is fixedly provided at one end of the rod away from the guide cylinder, a rubber ring is fixedly provided on the outside of the rod, the rubber ring is slidably arranged with the inner wall of the guide cylinder, two limit rings are fixedly provided inside the guide cylinder, the rubber ring is located between the two limit rings, and the guide cylinder is fixedly connected to the inside of the cavity shell annular body.

[0010] Preferably, the top of the connecting tube is threadedly rotatably arranged inside the threaded rod, the buffer spring is spirally arranged on the outside of the connecting tube, and the rubber pad is slidably arranged on the inner wall of the square tube.

[0011] Preferably, a circular groove is provided at the bottom of the disk body for inserting and placing the positioning block.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In the present invention, after the visual inspection device detects the hole position of the injection molded part inside the carrier, the small stepping motor is started to drive the first slot rod and the first buckle plate to rotate. Since the first slot rod and the second slot rod are meshed with the toothed belt, the shaft cylinder, the second slot rod, the second buckle plate, the connecting block, the handle rod and the positioning block are an integrated carrier structure, which can drive the above-mentioned integrated carrier structure to rotate around the vertical center axis of the sleeve and the first clamping ring. Through the above-mentioned arrangement, the placement position of the injection molded part can be angularly deflected, which is convenient for the visual inspection device to perform multiple groups of capture detection on the hole position of the injection molded part, thereby improving the detection accuracy of the hole position of the injection molded part;

[0014] 2. In the present invention, the shaft rotating part is manually rotated forward, and the shaft rotating part drives the threaded rod to rotate. Since the threaded rod and the top end of the connecting tube are arranged for threaded rotation, the rubber pad slides downward in the inner area of ​​the square tube, and the buffer spring is in a tensile state of auxiliary buffering. The limit plate plays a blocking and limiting role on the disc and the rubber pad, so that the disc and the rubber pad squeeze the filling oil downward, and the filling oil squeezes the rod and the rubber ring, driving the rod and the flexible pad to protrude outward, and the side position of the injection molded part is limited by the interference. Through the above arrangement, it is convenient to quickly clamp and limit multiple groups of injection molded parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure at point A;

[0017] Figure 3 It is a schematic diagram of the upper and lower split structure of the base frame and the material carrier of the present invention;

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of some components of the base frame of the present invention;

[0019] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at B;

[0020] Figure 6 For the present invention Figure 4 A schematic diagram of the enlarged structure at C;

[0021] Figure 7 It is a schematic diagram of the cross-sectional structure of some components of the material carrier of the present invention;

[0022] Figure 8 For the present invention Figure 7 A schematic diagram of the structure at D of FIG.

[0023] Fig. 9 It is a schematic diagram of the cross-sectional structure of the cavity shell of the present invention;

[0024] Fig.10 For the present invention Fig. 9 Enlarged structural diagram at E.

[0025] In the figure: 1, base frame; 101, substrate; 102, small stepping motor; 103, sleeve; 104, first retaining ring; 105, first slotted rod; 106, first buckle plate; 107, shaft cylinder; 108, second slotted rod; 109, second buckle plate; 110, connecting block; 111, handle rod; 112, positioning block; 113, toothed belt; 2, material carrier; 21, disk body; 22, cavity shell; 23, adjusting device; 231, square cylinder; 232, second retaining ring; 233, shaft rotating member; 234, threaded rod; 235, limit plate; 236, disc; 237, rubber pad; 238, connecting cylinder; 239, buffer spring; 24, clamping device; 241, guide cylinder; 242, rod; 243, flexible pad; 244, rubber ring; 245, limit ring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0027] In the embodiments of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Similarly, similar words such as "one", "an", or "the" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Similar words such as "include" or "comprises" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0028] In addition, in the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] See also Figure 1-10, the present invention provides a technical solution:

[0030] A device for detecting the hole position of an injection molded part comprises a base frame 1 and a material carrier 2. The material carrier 2 is arranged on the top of the base frame 1. The base frame 1 comprises a base plate 101, a small stepping motor 102, a sleeve 103, a first retaining ring 104, a first slotted rod 105, a first buckle plate 106, a shaft cylinder 107, a second slotted rod 108, a second buckle plate 109, a connecting block 110, a handle rod 111, a positioning block 112 and a toothed belt 113. A small stepping motor 102 and two sleeves 103 are fixedly arranged on the top of the base plate 101. The two sleeves 103 are symmetrically distributed and arranged at the front and rear sides of the vertical central axis of the small stepping motor 102. A first retaining ring 104 is fixedly arranged inside the sleeve 103. A first slotted rod 105 is arranged on the top of the small stepping motor 102. The top and bottom of the first slotted rod 105 are symmetrical. Two first buckle plates 106 are distributed and fixedly arranged, the bottom end of the first buckle plate 106 arranged at the bottom is fixedly arranged on the main shaft of the small stepping motor 102, the inside of the sleeve 103, the first retaining ring 104 and the shaft cylinder 107 are rotatably arranged, a second slotted rod 108 is arranged on the top of the shaft cylinder 107, and second buckle plates 109 are symmetrically distributed and fixedly arranged on the top and bottom ends of the second slotted rod 108, a connecting block 110 is fixedly arranged on the top of the second buckle plate 109 arranged at the top, a handle rod 111 is fixedly arranged on the outside of the connecting block 110, and a positioning block 112 is fixedly arranged on the end of the handle rod 111 away from the connecting block 110, the bottom end of the second buckle plate 109 arranged at the bottom is fixedly arranged on the top of the shaft cylinder 107, a tooth groove is provided on the outside of the first slotted rod 105, and a tooth groove is provided on the outside of the second slotted rod 108 to mesh with a toothed belt 113.

[0031] The carrier 2 includes a disc body 21, a cavity shell 22, an adjusting device 23 and a clamping device 24. The cavity shell 22 is fixedly arranged on the top of the disc body 21, the adjusting device 23 is fixedly arranged on the central top of the cavity shell 22, and the clamping device 24 is arranged inside the circular body of the cavity shell 22. Through the above arrangement, the carrier 2 can distribute and place the injection molded parts.

[0032] The adjusting device 23 includes a square tube 231, a second clamping ring 232, a shaft rotating member 233, a threaded rod 234, a limit plate 235, a disc 236, a rubber pad 237, a connecting tube 238 and a buffer spring 239. The second clamping ring 232 is fixedly arranged inside the top of the square tube 231. The top of the square tube 231 and the second clamping ring 232 are rotatably arranged with the shaft rotating member 233. The threaded rod 234 is fixedly arranged at the bottom of the shaft rotating member 233. Two limit plates 235 are fixedly arranged on the inner wall of the square tube 231. A rubber pad 237 is arranged between the top and bottom limit plates 235. The disc 236 has a rubber pad 237 fixedly arranged on the outside of the disc 236, a connecting tube 238 fixedly arranged on the top of the disc 236, a buffer spring 239 fixedly arranged between the top of the disc 236 and the inner wall of the top of the square tube 231, and the bottom end of the square tube 231 is fixedly connected to the top of the cavity shell 22. Through the above arrangement, the internal filling area below the square tube 231, the internal filling area of ​​the cavity shell 22 and the internal filling area of ​​the guide tube 241 are filled with oil, forming an adjusting device 23 for squeezing the filling oil through the disc 236 and the rubber pad 237.

[0033] The clamping device 24 includes a guide cylinder 241, a rod 242, a flexible pad 243, a rubber ring 244 and a limit ring 245. The guide cylinder 241 is provided with a rod 242 inside, and a flexible pad 243 is fixedly provided at one end of the rod 242 away from the guide cylinder 241. A rubber ring 244 is fixedly provided on the outside of the rod 242. The rubber ring 244 is slidably arranged with the inner wall of the guide cylinder 241. Two limit rings 245 are fixedly arranged inside the guide cylinder 241. The rubber ring 244 is located between the two limit rings 245. The guide cylinder 241 is fixedly connected to the inside of the circular ring body of the cavity shell 22. Through the above arrangement, a clamping device 24 is formed to limit the injection molded part by the flexible pad 243 arranged on the outside of the rod 242.

[0034] The top of the connecting tube 238 is threadedly rotated with the threaded rod 234, the buffer spring 239 is spirally arranged on the outside of the connecting tube 238, and the rubber pad 237 is slidably arranged on the inner wall of the square tube 231. Through the above arrangement, the buffer spring 239 plays an auxiliary buffering role for the disc 236 and the rubber pad 237.

[0035] A circular groove is provided at the bottom of the plate body 21 for inserting and placing the positioning block 112 . Through the above arrangement, it is convenient to install and place the material carrier 2 on the base frame 1 .

[0036] Workflow: The present invention provides an injection molded part hole position detection device, which can angularly deflect the placement position of the injection molded part, facilitate the visual inspection device to perform multiple groups of capture detection on the injection molded part hole positions, improve the detection accuracy of the injection molded part hole positions, and facilitate the rapid clamping and limiting of multiple groups of injection molded parts.

[0037] The small stepper motor 102 provided in the device is controlled by an external PLC controller, and the small stepper motor 102 provided above is electrically connected to an external power source, such as Figure 7 , Figure 8 , Fig. 9 as well as Fig.10 As shown, the inner filling area below the square cylinder 231, the inner filling area of ​​the cavity shell 22, and the inner filling area of ​​the guide cylinder 241 are filled with oil.

[0038] First, the injection molded part is placed in the inner area of ​​the annular body of the cavity shell 22, and the top of the disk body 21 is in contact with the bottom of the injection molded part. The disk 236, the rubber pad 237 and the connecting tube 238 are an integrated sliding plug, wherein the rubber pad 237 is made of hard polymerized vulcanized rubber. The disk 236 is fixedly set inside the central circular hole of the square rubber pad 237. The shaft rotating part 233 is manually rotated forward, and the shaft rotating part 233 drives the threaded rod 234 to rotate. Since the threaded rod 234 and the top of the connecting tube 238 are threadedly rotated, the rubber pad 237 is in the square tube 2 31, the inner area slides downward, the buffer spring 239 is in a stretched state of auxiliary buffering, and the limit plate 235 plays a blocking and limiting role on the disc 236 and the rubber pad 237, so that the disc 236 and the rubber pad 237 squeeze the filling oil downward, and the filling oil squeezes the rod 242 and the rubber ring 244, driving the rod 242 and the flexible pad 243 to protrude outward, and the side position of the injection molded part is resisted and limited, wherein the flexible pad 243 is a soft silicone material, and the limit ring 245 plays a blocking and limiting role on the rod 242 and the rubber ring 244.

[0039] Manually open a circular groove at the bottom of the disk 21 and insert the positioning block 112, install the carrier 2 on the base frame 1, and place the base frame 1 and the carrier 2 as a whole on the inspection platform of the visual inspection device. The common visual inspection device is equipped with an optical inspection component and a guide rail moving component, which is the prior art and will not be described in detail in this article.

[0040] After the visual inspection device detects the hole positions of the injection molded parts inside the carrier 2, the small stepper motor 102 is started to drive the first slot rod 105 and the first buckle plate 106 to rotate. Since the first slot rod 105 and the second slot rod 108 are meshed with the toothed belt 113, the shaft tube 107, the second slot rod 108, the second buckle plate 109, the connecting block 110, the handle rod 111 and the positioning block 112 are an integrated carrier structure, which can drive the above-mentioned integrated carrier structure to rotate around the vertical center axis of the sleeve 103 and the first retaining ring 104, and can deflect the angle of the injection molded parts placed inside the carrier 2, so as to facilitate the visual inspection device to perform multiple groups of capture detection on the hole positions of the injection molded parts, thereby improving the detection accuracy of the hole positions of the injection molded parts.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the hole position of an injection molded part, comprising a base frame (1) and a material carrier (2), characterized in that: A material carrier (2) is arranged on the top of the base frame (1). The base frame (1) comprises a base plate (101), a small stepping motor (102), a sleeve (103), a first retaining ring (104), a first slotted rod (105), a first buckle plate (106), a shaft tube (107), a second slotted rod (108), a second buckle plate (109), a connecting block (110), a handle rod (111), a positioning block (112) and a toothed belt (113). A small stepping motor (102) and two sleeves (103) are fixedly arranged on the top of the base frame (101). The two sleeves (103) are symmetrically arranged at the front and rear sides of the vertical center axis of the small stepping motor (102). A first retaining ring (104) is fixedly arranged inside the sleeve (103). A first slotted rod (105) is arranged on the top of the small stepping motor (102). Two second slotted rods (105) are symmetrically fixedly arranged at the top and bottom of the first slotted rod (105). A buckle plate (106), the bottom end of the first buckle plate (106) arranged at the bottom is fixedly arranged with the main shaft of the small stepping motor (102), the inside of the sleeve (103), the first clamping ring (104) and the shaft cylinder (107) are rotatably arranged, the top of the shaft cylinder (107) is provided with a second slot rod (108), the top and bottom ends of the second slot rod (108) are symmetrically distributed and fixedly provided with a second buckle plate (109), and the second buckle plate (109) arranged at the top ) is fixedly provided with a connecting block (110) at the top, a handle rod (111) is fixedly provided on the outer side of the connecting block (110), a positioning block (112) is fixedly provided on one end of the handle rod (111) away from the connecting block (110), the bottom end of the second buckle plate (109) arranged at the bottom is fixedly provided with the top end of the shaft tube (107), the first groove rod (105) is provided with a tooth groove on the outer side, and the second groove rod (108) is provided with a tooth groove on the outer side to engage with a toothed belt (113).

2. The device for detecting the hole position of an injection molded part according to claim 1, characterized in that: The material carrier (2) comprises a disc body (21), a cavity shell (22), an adjusting device (23) and a clamping device (24); the cavity shell (22) is fixedly arranged at the top of the disc body (21); the adjusting device (23) is fixedly arranged at the central top of the cavity shell (22); and the clamping device (24) is arranged inside the annular body of the cavity shell (22).

3. The device for detecting the hole position of an injection molded part according to claim 2, characterized in that: The adjusting device (23) comprises a square tube (231), a second clamping ring (232), a shaft rotating member (233), a threaded rod (234), a limiting plate (235), a disc (236), a rubber pad (237), a connecting tube (238) and a buffer spring (239); the second clamping ring (232) is fixedly arranged inside the top end of the square tube (231); the top end of the square tube (231), the second clamping ring (232) and the shaft rotating member (233) are rotatably arranged inside; the bottom end of the shaft rotating member (233) is fixedly arranged with a threaded rod (234). A threaded rod (234) is provided, two limit plates (235) are fixedly provided on the inner wall of the square tube (231), a disc (236) is provided between the top and bottom limit plates (235), a rubber pad (237) is fixedly provided on the outer side of the disc (236), a connecting tube (238) is fixedly provided on the top of the disc (236), a buffer spring (239) is fixedly provided between the top of the disc (236) and the inner wall of the top of the square tube (231), and the bottom end of the square tube (231) is fixedly connected to the top of the cavity shell (22).

4. The device for detecting the hole position of an injection molded part according to claim 2, characterized in that: The clamping device (24) comprises a guide cylinder (241), a rod (242), a flexible pad (243), a rubber ring (244) and a limiting ring (245); the guide cylinder (241) is provided with a rod (242) inside; the flexible pad (243) is fixedly provided at one end of the rod (242) away from the guide cylinder (241); a rubber ring (244) is fixedly provided on the outside of the rod (242); the rubber ring (244) is slidably arranged with the inner wall of the guide cylinder (241); two limiting rings (245) are fixedly provided inside the guide cylinder (241); the rubber ring (244) is located between the two limiting rings (245); and the guide cylinder (241) is fixedly connected with the inside of the annular body of the cavity shell (22).

5. The device for detecting the hole position of an injection molded part according to claim 3, characterized in that: The top of the connecting tube (238) is threadedly rotatably arranged inside the threaded rod (234), the buffer spring (239) is spirally arranged outside the connecting tube (238), and the rubber pad (237) is slidably arranged on the inner wall of the square tube (231).

6. The device for detecting the hole position of an injection molded part according to claim 2, characterized in that: The bottom of the disk body (21) is provided with a circular groove for inserting and placing a positioning block (112).