Novel needle type clamping jaw

Abstract

The utility model discloses a novel needle type clamping jaw, which belongs to the technical field of clamps and comprises a shell consisting of an upper shell and a lower shell, a piston is slidably connected in the upper shell, the bottom end of the piston is connected with a linkage rod, the bottom end of the linkage rod is connected with a movable seat, needle seats are arranged on two sides of the movable seat, and each needle seat comprises two needle plates which are attached and staggered. Horizontal sliding long holes and inclined guide inclined holes are formed in the two needle plates, clamping needle sets are installed at the bottom ends of the two needle plates, guide blocks are connected to the two sides of the movable base and matched with the sliding long holes, and a fixing rod is installed in the lower shell and matched with the guide inclined holes; the upper shell is provided with two air inlet holes and corresponding air pipe joints, the clamping jaw controls the piston to ascend and descend through air, the clamping needle set is driven to stretch out and retract back, light, thin and soft materials are grabbed gently, falling and damage are avoided, the stretching length of the clamping needles can be adjusted to be matched with a scene, the shells are detachable, maintenance is convenient, and safety and convenience are both considered.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, and in particular to a novel needle-type clamp. Background Technology

[0002] Existing structures for gripping objects mostly employ silicone vacuum suction cups and pneumatic clamps. Among them, silicone vacuum suction cups rely on negative pressure adsorption, which can easily cause thin, small items to fall off due to insufficient adsorption area or difficulty in maintaining stable negative pressure. Traditional pneumatic clamps, on the other hand, achieve gripping through rigid clamping action, making it difficult to precisely control the clamping force. This can easily damage or crush thin items, and for soft materials, it can easily cause structural damage or unstable gripping due to compression.

[0003] Therefore, those skilled in the art have provided a novel needle gripper to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a novel needle gripper.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A novel needle gripper includes a housing, which is composed of an upper housing and a lower housing. A piston is slidably connected to the inner side of the upper housing along the vertical direction. A connecting rod is fixedly connected to the bottom end of the piston. A movable seat is fixedly connected to the bottom end of the connecting rod. Needle seats are provided on both sides of the movable seat.

[0007] The needle holder consists of two mutually fitted and horizontally offset first and second needle plates. Each of the first and second needle plates has a sliding elongated hole in the horizontal direction, and the horizontal axes of the two sliding elongated holes are offset. Each of the first and second needle plates also has a guide oblique hole in the oblique direction, and the two guide oblique holes are symmetrical about the vertical plane. A needle clamping assembly is fixedly installed at the bottom of each of the first and second needle plates. The needle clamping assembly consists of multiple obliquely arranged clamping needles arranged side by side in the horizontal direction, and the oblique directions of the clamping needles in the two clamping needle assemblies are opposite, and they are distributed in a cross-offset manner on the vertical projection plane.

[0008] Guide blocks are fixedly connected to both sides of the movable seat. The guide blocks are slidably adapted to the sliding elongated holes on the first needle plate and the second needle plate. A fixing rod is fixedly installed on the inner side of the lower housing. One end of the fixing rod passes through the guide oblique hole on the first needle plate and the second needle plate and is slidably adapted to the guide oblique hole.

[0009] The upper housing is provided with a first air inlet and a second air inlet, and a first air pipe connector and a second air pipe connector are fixedly installed on the outer side of the upper housing at the positions corresponding to the first air inlet and the second air inlet.

[0010] Preferably, the piston consists of a piston ring and a piston rod integrally formed in the middle of the piston ring. The piston ring is slidably connected to the inner side of the upper housing. The bottom end of the piston rod is fixedly connected to the connecting rod. An annular groove is provided on the outer side wall of the piston ring, and a first sealing ring for sealing is installed in the annular groove.

[0011] Preferably, the first air inlet is connected to the upper chamber above the piston ring inside the upper housing, and the second air inlet is connected to the lower chamber below the piston ring inside the upper housing. Both the first air pipe connector and the second air pipe connector are connected to the external solenoid valve and air source through air pipes.

[0012] Preferably, each end of the fixing rod is fitted with a limiting ring, and the two limiting rings are respectively attached to the two needle seats on opposite sides to limit the horizontal displacement of the two needle seats along the axial direction of the fixing rod;

[0013] The bottom of the movable seat is provided with an arc-shaped clearance groove, which is used to avoid the fixed rod and prevent structural interference between the two when the movable seat moves.

[0014] Preferably, the upper housing and the lower housing are detachably connected by screws. The top of the upper housing is fixedly mounted with a mounting bracket for overall installation by screws. The bottom opening of the lower housing is detachably mounted with a bottom cover by screws. The bottom cover has a guide hole for the clamping pin assembly to pass through and move.

[0015] Preferably, an external threaded ring is fitted on the outer side of the linkage rod, and an adjusting nut is fitted on the outer side of the external threaded ring through a threaded adapter. Operating cavities are symmetrically opened in the middle of both sides of the housing, and an movable hole communicating with the inside of the housing is opened on the inner side of the operating cavity. The outer part of the adjusting nut extends to the outside of the housing through the movable hole.

[0016] Preferably, the outer side wall of the external threaded ring is provided with an anti-rotation groove along the axial direction, and a limit post is fixedly installed on the inner side of the housing. One end of the limit post is slidably connected in the anti-rotation groove to limit the circumferential rotation of the external threaded ring.

[0017] Preferably, the outer wall of the adjusting nut is provided with uniformly distributed grooves in an annular pattern, and a locking screw is threaded onto the housing. One end of the locking screw extends into the inner side of the housing and can be inserted into the inner side of the corresponding groove on the same axis.

[0018] Preferably, an annular groove is provided at both the upper and lower ends of the inner sidewall of the external threaded ring and a second sealing ring is installed thereon, and an annular groove is provided at the top end of the outer sidewall of the external threaded ring and a third sealing ring is installed thereon.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] The piston is raised and lowered by introducing compressed gas through different air pipe joints. The piston then drives the movable seat to move synchronously through the linkage rod. The guide blocks on both sides of the movable seat slide in the sliding elongated holes of the first and second needle plates. With the guidance of the fixed rod and the guide oblique hole in the lower housing, the two needle plates are driven to move horizontally closer or further apart and extend and retract vertically at the same time. This drives the needle clamping assembly at the bottom of the needle plates to complete the "extend-retract" action, gently wrapping thin, small and soft materials, avoiding the fall or damage when gripping with traditional structures, and ensuring gripping safety. At the same time, by rotating the adjusting nut on the outside of the housing, the external threaded ring is driven to move axially along the linkage rod to change the piston's downward stroke, flexibly adjusting the extension length of the needle clamping assembly to adapt to different scenario requirements. The detachable connection between the upper and lower housings and between the lower housing and the bottom cover facilitates the maintenance of the internal components and takes into account both stability and convenience of use. Attached Figure Description

[0021] To illustrate the technical solutions in the embodiments of the present invention or the prior art more specifically and intuitively, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0022] Figure 1 This is a schematic diagram of the novel needle-type gripper structure proposed in this utility model;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the shell proposed in this utility model;

[0024] Figure 3 This is an exploded view of the needle-type gripper structure proposed in this utility model;

[0025] Figure 4 This is a schematic diagram of the fixing rod installation structure proposed in this utility model;

[0026] Figure 5 This is a schematic diagram of the needle holder mounting structure proposed in this utility model;

[0027] Figure 6 This is a schematic diagram of the needle holder structure proposed in this utility model;

[0028] Figure 7 This is a schematic diagram of the external threaded ring mounting structure proposed in this utility model;

[0029] Figure 8 This is a schematic diagram of the piston ring mounting structure proposed in this utility model.

[0030] In the diagram: 1. Housing; 101. Upper housing; 102. Lower housing; 2. Piston ring; 3. Piston column; 4. Connecting rod; 5. Movable seat; 6. Needle seat; 61. First needle plate; 62. Second needle plate; 63. Sliding elongated hole; 64. Guide oblique hole; 65. Needle clamping assembly; 7. Fixing rod; 8. Guide block; 9. First air pipe connector; 10. Second air pipe connector; 11. Mounting bracket; 12. Bottom cover; 13. External threaded ring; 14. Adjusting nut; 15. Operating cavity; 16. Movable hole; 17. Anti-rotation groove; 18. Limiting post; 19. Slot; 20. Locking screw; 21. First sealing ring; 22. Second sealing ring; 23. Third sealing ring. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] Reference Figure 1-8 A novel needle gripper includes a housing 1, which is composed of an upper housing 101 and a lower housing 102. A piston is slidably connected to the inner side of the upper housing 101 in the vertical direction. A connecting rod 4 is fixedly connected to the bottom end of the piston. A movable seat 5 is fixedly connected to the bottom end of the connecting rod 4. Needle seats 6 are provided on both sides of the movable seat 5.

[0033] The needle holder 6 consists of two needle plates 61 and 62 that fit together and are staggered in the horizontal direction. Both needle plates 61 and 62 have sliding elongated holes 63 in the horizontal direction, and the horizontal axes of the two sliding elongated holes 63 are staggered. Both needle plates 61 and 62 also have oblique guide holes 64 in the oblique direction, and the two guide holes 64 are symmetrical about the vertical plane. The bottom ends of both needle plates 61 and 62 are fixedly installed with needle clamping groups 65. The needle clamping groups 65 consist of multiple obliquely arranged needles arranged side by side in the horizontal direction, and the oblique directions of the needles in the two needle clamping groups 65 are opposite, and they are staggered in the vertical projection plane.

[0034] Guide blocks 8 are fixedly connected to both sides of the movable seat 5. The guide blocks 8 are slidably adapted to the sliding elongated holes 63 on the first needle plate 61 and the second needle plate 62. A fixing rod 7 is fixedly installed inside the lower housing 102. One end of the fixing rod 7 passes through the guide inclined holes 64 on the first needle plate 61 and the second needle plate 62 and is slidably adapted to the guide inclined holes 64.

[0035] The upper housing 101 is provided with a first air inlet and a second air inlet, and a first air pipe connector 9 and a second air pipe connector 10 are fixedly installed on the outer side of the upper housing 101 at the positions corresponding to the first air inlet and the second air inlet.

[0036] Using the above technical solution, the gripper achieves safe gripping of soft materials and thinner items through the action logic of "extending and retracting the gripper needle," and the entire action is precisely controlled by the air circuit: when compressed air is introduced into the upper chamber above the piston ring 2 inside the upper housing 101 through the first air pipe connector 9, the air pressure pushes the piston to move vertically downward along the inner side of the upper housing 101, and the piston drives the movable seat 5 to move downward synchronously through the connecting rod 4; the guide blocks 8 on both sides of the movable seat 5 move downward in the sliding elongated holes 63 of the first needle plate 61 and the second needle plate 62, and with the guiding action of the fixed rod 7 and the guide oblique hole 64 inside the lower housing 102, the first needle plate 61 and the second needle plate 62 move relatively far apart in the horizontal direction. Simultaneously, the entire assembly extends vertically along with the movable seat 5; at this time, the two clamping needle assemblies 65 extend in a staggered manner, reaching deep into the placement area of ​​soft materials and thinner items; when compressed air is switched to the second air pipe connector 10 and introduced into the lower chamber below the piston ring 2 inside the upper housing 101, the air pressure pushes the piston to move vertically upward, and the connecting rod 4 drives the movable seat 5 to move upward synchronously; the guide block 8 moves upward in the sliding elongated hole 63, and while the first needle plate 61 and the second needle plate 62 approach each other in the horizontal direction, the entire assembly retracts vertically along with the movable seat 5; the clamping needle assemblies 65 retract in a staggered manner with a reduced spacing, gently wrapping soft materials and thinner items, avoiding deformation or damage caused by hard clamping, and achieving safe gripping.

[0037] The piston consists of a piston ring 2 and a piston rod 3 integrally formed in the middle of the piston ring 2. The piston ring 2 is slidably connected to the inner side of the upper housing 101. The bottom end of the piston rod 3 is fixedly connected to the connecting rod 4. An annular groove is provided on the outer side wall of the piston ring 2, and a first sealing ring 21 for sealing is installed in the annular groove.

[0038] Using the above technical solution, the first sealing ring 21 in the annular groove on the outer side of the piston ring 2 can effectively seal the gap between the piston ring 2 and the inner wall of the upper housing 101, prevent gas crossflow between the upper and lower chambers, ensure that the gas pressure can stably push the piston down or up, and thus ensure the smoothness of the movement of the connecting rod 4 driving the movable seat 5.

[0039] The first air inlet is connected to the upper chamber above the piston ring 2 inside the upper housing 101, and the second air inlet is connected to the lower chamber below the piston ring 2 inside the upper housing 101. The first air pipe connector 9 and the second air pipe connector 10 are both connected to the external solenoid valve and air source through air pipes.

[0040] By adopting the above technical solution, the air supply status of the two air pipe joints can be switched by a solenoid valve, which can precisely control the piston to move down or up, and achieve seamless switching of gripping action.

[0041] Both ends of the fixing rod 7 are fitted with limiting rings. The two limiting rings are respectively attached to the two needle seats 6 on the opposite side, which is used to limit the horizontal displacement of the two needle seats 6 along the axial direction of the fixing rod 7.

[0042] The bottom of the movable seat 5 is provided with an arc-shaped clearance groove, which is used to avoid the fixed rod 7 and prevent structural interference between the two when the movable seat 5 moves.

[0043] Using the above technical solution, the limiting rings sleeved at both ends of the fixing rod 7 can accurately limit the installation position of the needle seat 6 on both sides of the movable seat 5, effectively preventing the needle seat 6 from shifting or even falling off along the axial direction of the fixing rod 7, and ensuring the relative position stability of the needle seat 6 and the movable seat 5; the arc-shaped clearance groove opened at the bottom of the movable seat 5 can avoid the fixing rod 7 during the up and down movement of the movable seat 5, avoiding collision and interference between the two, ensuring smooth movement of the movable seat 5, while the fixing rod 7 can normally play the guiding role of the needle seat 6.

[0044] The upper housing 101 and the lower housing 102 are detachably connected by screws. The top of the upper housing 101 is fixedly installed with a mounting bracket 11 for overall installation by screws. The bottom opening of the lower housing 102 is detachably installed with a bottom cover 12 by screws. The bottom cover 12 has a guide hole for the clamping pin assembly 65 to pass through and move.

[0045] Using the above technical solution, the upper housing 101 and the lower housing 102 are detachably connected by screws, which facilitates the later maintenance of internal components such as pistons and needle plates. The mounting bracket 11 at the top of the upper housing 101 can fix the gripper to the external device as a whole, adapting to the gripping needs of soft materials and thinner items in different scenarios. The guide hole opened on the bottom cover 12 can accurately guide the extension and retraction movement of the needle clamping assembly 65, ensuring that the needle clamping can smoothly extend out of the housing. At the same time, the bottom cover 12 adopts a detachable design, which can completely expose the inner cavity of the lower housing 102 after disassembly, providing sufficient space for the disassembly and assembly of the screws between the upper housing 101 and the lower housing 102, improving the convenience of component assembly and later maintenance.

[0046] An external threaded ring 13 is fitted on the outer side of the linkage rod 4. An adjusting nut 14 is fitted on the outer side of the external threaded ring 13 through a threaded adapter. Operating cavities 15 are symmetrically opened in the middle of both sides of the housing 1. An movable hole 16 communicating with the inside of the housing 1 is opened on the inner side of the operating cavity 15. The outer part of the adjusting nut 14 passes through the movable hole 16 to the outside of the housing 1.

[0047] Using the above technical solution, the operating recesses 15 on both sides of the housing 1 provide ample space for the rotation of the adjusting nut 14; the inner side of the recesses 15 connects to the movable holes 16 inside the housing 1, which allow the adjusting nut 14 to pass through on both sides, and limit its movement along the linkage rod 4 by limiting the adjusting nut 14 through the hole wall, ensuring that the adjusting nut 14 can only rotate circumferentially to drive the external threaded ring 13 to move; the maximum downward movement of the piston rod 3 is limited by its bottom end abutting against the top surface of the external threaded ring 13; by rotating the adjusting nut 14 that passes through the movable holes 16 on the outside of the housing 1, the external threaded ring 13 can be driven to move up and down along the linkage rod 4, changing the relative distance between the external threaded ring 13 and the bottom end of the piston rod 3; the change in the piston's downward stroke is transmitted to the clamping needle assembly 65 through the linkage rod 4, the movable seat 5, and the needle seat 6, ultimately achieving precise adjustment of the outward extension length of the clamping needle, adapting to the gripping needs of soft materials and thinner items in different depth placement scenarios.

[0048] An anti-rotation groove 17 is provided on the outer side wall of the external threaded ring 13 along the axial direction. A limit post 18 is fixedly installed on the inner side of the housing 1. One end of the limit post 18 is slidably connected in the anti-rotation groove 17 to limit the circumferential rotation of the external threaded ring 13.

[0049] Using the above technical solution, the anti-rotation groove 17 on the outer wall of the external threaded ring 13 slides and adapts to the limiting post 18 on the inner side of the housing 1, which can strictly limit the circumferential rotation of the external threaded ring 13. When the adjusting nut 14 is rotated to adjust the position, the external threaded ring 13 will only move axially along the connecting rod 4 and will not rotate synchronously with the adjusting nut 14, ensuring the accurate adjustment of the position of the external threaded ring 13, thereby ensuring the adjustment accuracy of the piston downward stroke and the extension length of the clamping needle, and avoiding adjustment deviation caused by the rotation of the external threaded ring 13.

[0050] The outer side wall of the adjusting nut 14 is evenly provided with a ring-shaped groove 19. A locking screw 20 is threadedly installed on the housing 1. One end of the locking screw 20 extends to the inner side of the housing 1 and can be inserted into the inner side of the corresponding groove 19 on the same axis.

[0051] Using the above technical solution, the annular groove 19 on the outer wall of the adjusting nut 14 cooperates with the locking screw 20 on the housing 1. After adjusting the position of the external thread ring 13 by adjusting the adjusting nut 14, the locking screw 20 is screwed into the corresponding groove 19 to fix the position of the adjusting nut 14, prevent other factors from causing rotation, ensure that the piston downward stroke and the needle extension length remain stable, and ensure the accuracy of the gripping action.

[0052] An annular groove is provided at both the upper and lower ends of the inner sidewall of the external threaded ring 13, and a second sealing ring 22 is installed thereon. An annular groove is provided at the top of the outer sidewall of the external threaded ring 13, and a third sealing ring 23 is installed thereon.

[0053] Using the above technical solution, the second sealing ring 22 on the inner side wall of the external threaded ring 13 can seal the gap between the external threaded ring 13 and the connecting rod 4; the third sealing ring 23 at the top of its outer side wall can seal the gap between the external threaded ring 13 and the housing 1; thereby preventing compressed air leakage in the upper housing 101; ensuring normal air pressure and maintaining reliable gripping action of the gripper.

[0054] Working principle:

[0055] When compressed air is introduced into the upper chamber above the piston ring 2 inside the upper housing 101 through the first air pipe connector 9, it pushes the piston to move vertically downward. This causes the movable seat 5 to move downward through the connecting rod 4. The guide blocks 8 on both sides of the movable seat 5 slide within the sliding elongated holes 63 of the first needle plate 61 and the second needle plate 62 of the needle seat 6. With the guidance of the fixed rod 7 and the guide inclined hole 64 inside the lower housing 102, the two needle plates are horizontally relatively far apart and extend vertically as a whole. The needle clamping assembly 65 extends outward in a staggered manner to the item placement area. When the compressed air is switched to the second air pipe connector 10 and introduced into the lower chamber below the piston ring 2, it pushes the piston to move upward. The connecting rod 4 causes the movable seat 5 to move upward. The guide block 8 causes the two needle plates to move horizontally relatively close together and retract vertically as a whole. The needle clamping assembly 65 retracts in a staggered manner and gently wraps the item, completing the gripping. At the same time, the position of the external threaded ring 13 can be adjusted by adjusting the nut 14 to change the piston's downward stroke and control the needle clamping extension length to adapt to different scenario requirements.

[0056] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel needle-type gripper, comprising a housing (1), characterized in that, The housing (1) is composed of an upper housing (101) and a lower housing (102). A piston is slidably connected to the inner side of the upper housing (101) in the vertical direction. A connecting rod (4) is fixedly connected to the bottom end of the piston. A movable seat (5) is fixedly connected to the bottom end of the connecting rod (4). A needle seat (6) is provided on both sides of the movable seat (5). The needle holder (6) is composed of two mutually fitted and horizontally offset first needle plates (61) and second needle plates (62). Both the first needle plate (61) and the second needle plate (62) have sliding elongated holes (63) in the horizontal direction, and the horizontal axes of the two sliding elongated holes (63) are offset. Both the first needle plate (61) and the second needle plate (62) also have obliquely opened guide oblique holes (64), and the two guide oblique holes (64) are symmetrically arranged about the vertical plane. The bottom ends of the first needle plate (61) and the second needle plate (62) are fixedly installed with needle clamping groups (65). The needle clamping groups (65) are composed of multiple obliquely arranged needles arranged side by side in the horizontal direction, and the oblique directions of the needles in the two needle clamping groups (65) are opposite, and they are distributed in a cross-offset manner on the vertical projection plane. Guide blocks (8) are fixedly connected to both the left and right sides of the movable seat (5). The guide blocks (8) are slidably adapted to the sliding elongated holes (63) on the first needle plate (61) and the second needle plate (62). A fixing rod (7) is fixedly installed on the inner side of the lower housing (102). One end of the fixing rod (7) passes through the guide oblique holes (64) on the first needle plate (61) and the second needle plate (62) and is slidably adapted to the guide oblique holes (64). The upper housing (101) is provided with a first air inlet and a second air inlet, and a first air pipe connector (9) and a second air pipe connector (10) are fixedly installed on the outer side of the upper housing (101) at the positions corresponding to the first air inlet and the second air inlet.

2. The novel needle gripper according to claim 1, characterized in that, The piston consists of a piston ring (2) and a piston rod (3) integrally formed in the middle of the piston ring (2). The piston ring (2) is slidably connected to the inner side of the upper housing (101). The bottom end of the piston rod (3) is fixedly connected to the connecting rod (4). An annular groove is provided on the outer side wall of the piston ring (2), and a first sealing ring (21) for sealing is installed in the annular groove.

3. A novel needle gripper according to claim 2, characterized in that, The first air inlet is connected to the upper chamber above the piston ring (2) inside the upper housing (101), and the second air inlet is connected to the lower chamber below the piston ring (2) inside the upper housing (101). The first air pipe connector (9) and the second air pipe connector (10) are both connected to the solenoid valve and air source of the outside through air pipes.

4. A novel needle gripper according to claim 1, characterized in that, Both ends of the fixing rod (7) are fitted with limiting rings. The two limiting rings are respectively attached to the two needle seats (6) on the opposite side, which is used to limit the horizontal displacement of the two needle seats (6) along the axial direction of the fixing rod (7). The bottom end of the movable seat (5) is provided with an arc-shaped clearance groove, which is used to avoid the fixed rod (7) and prevent structural interference between the two when the movable seat (5) moves.

5. A novel needle gripper according to claim 1, characterized in that, The upper housing (101) and the lower housing (102) are detachably connected by screws. The top of the upper housing (101) is fixedly installed with a mounting bracket (11) for overall installation by screws. The bottom opening of the lower housing (102) is detachably installed with a bottom cover (12) by screws. The bottom cover (12) has a guide hole for the clamping pin assembly (65) to pass through and move.

6. A novel needle gripper according to claim 1, characterized in that, The outer side of the linkage rod (4) is fitted with an external threaded ring (13), and the outer side of the external threaded ring (13) is fitted with an adjusting nut (14) through a threaded adapter. The two sides of the housing (1) are symmetrically provided with operating cavities (15). The inner side of the operating cavity (15) is provided with a movable hole (16) that communicates with the inside of the housing (1). The outer part of the adjusting nut (14) passes through the movable hole (16) to the outside of the housing (1).

7. A novel needle gripper according to claim 6, characterized in that, The outer side wall of the external threaded ring (13) is provided with an anti-rotation groove (17) along the axial direction. A limit post (18) is fixedly installed on the inner side of the housing (1). One end of the limit post (18) is slidably connected in the anti-rotation groove (17) to limit the circumferential rotation of the external threaded ring (13).

8. A novel needle gripper according to claim 6, characterized in that, The outer side wall of the adjusting nut (14) is evenly provided with a ring-shaped groove (19). A locking screw (20) is threadedly installed on the housing (1). One end of the locking screw (20) extends to the inner side of the housing (1) and can be inserted into the inner side of the corresponding groove (19) on the same axis.

9. A novel needle gripper according to claim 6, characterized in that, The inner sidewall of the external threaded ring (13) has an annular groove at both the upper and lower ends and a second sealing ring (22) is installed thereon. The outer sidewall of the external threaded ring (13) has an annular groove at the top end and a third sealing ring (23) is installed thereon.

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