Finished product detection device for antistatic protective clothing processing

Abstract

The invention relates to the related technical field of antistatic protective clothing production and detection, in particular to a finished product detection device for antistatic protective clothing processing, which comprises a detection robot trunk, detection robot lower limbs, detection robot upper limbs and a detection robot head, the detection robot lower limbs, the detection robot upper limbs and the detection robot head are all connected with the detection robot trunk; a plurality of electrode plates are arranged on the outer side of an air bag layer on a detection robot trunk, a detection robot lower limb, a detection robot upper limb and a detection robot head, so that a to-be-detected antistatic protective garment is put on the detection robot, and the air bag layer is inflated; therefore, each electrode plate can be in stable contact with the to-be-detected antistatic protective clothing, then the electrode plates are controlled to form a plurality of electrode groups, each electrode group is tested independently, so that the convenience of the testing process is improved, and after the antistatic protective clothing is positioned at a time, multiple groups of data can be tested.

Description

Technical Field

[0001] The invention relates to the technical field related to production and detection of antistatic protective clothing, and in particular to a finished product detection device for processing antistatic protective clothing. Background Art

[0002] Antistatic protective clothing is a work clothing made of antistatic fabrics and sewn in accordance with the specified style and structure to prevent static electricity accumulation on clothing. It is widely used in electronics, optical instruments, pharmaceuticals, microbial engineering, precision instruments, oil fields, petrochemicals, electricity, coal and other industries;

[0003] The existing Chinese patent document with the announcement number CN217906459U discloses a finished product detection device for antistatic protective clothing processing, which includes a columnar upright pole, a base plate is fixed to the bottom end of the columnar upright pole, and the base plate is disc-shaped as a whole. A sliding sleeve is slidably connected to the side of the columnar upright pole, and a connecting rod a with a circular cross-section is fixed to the outer wall of the sliding sleeve. The end of the connecting rod a away from the sliding sleeve is connected to a display hanger, and an adjustment mechanism for limiting the sliding sleeve is provided on the side of the sliding sleeve;

[0004] However, the detection device in the above technical solution is only to simply hang the protective clothing, and subsequently the staff are required to hold the detection equipment to perform anti-static testing. For the sake of detection efficiency, the staff usually simply select a few points for detection, and the detection accuracy is low. Therefore, the present invention proposes a finished product detection device for anti-static protective clothing processing to solve the above problem. Summary of the invention

[0005] The purpose of the present invention is to provide a finished product detection device for antistatic protective clothing processing to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a finished product inspection device for antistatic protective clothing processing, comprising a detection robot trunk, a detection robot lower limb, a detection robot upper limb and a detection robot head, wherein the detection robot lower limb, the detection robot upper limb and the detection robot head are all connected to the detection robot trunk, and the movable angle of the connection structure between the detection robot lower limb, the detection robot upper limb, the detection robot head and the detection robot trunk is the same as the movable angle of the human body joint, and a detection system is arranged inside the detection robot trunk;

[0007] The lower limb of the detection robot is composed of a limb body, an airbag layer and an electrode sheet. The limb body is provided with a mounting groove, and the bottom of the mounting groove is provided with an air hole. The inner port of the air hole and the air inlet of the airbag layer are connected to the micro air pump inside the limb body through an air pipe, and the air pipe is connected to an electronic pressure relief valve. A conductive ring is integrally formed on the side wall of the air hole. The airbag layer is covered and arranged on the outside of the limb body, and the electrode sheet is arranged on the outer layer of the airbag layer, and an installation channel is reserved on the airbag layer, and the installation channel is arranged corresponding to the installation groove.

[0008] Preferably, the structural composition of the detection robot torso, detection robot upper limbs, and detection robot head are similar to the structural composition of the detection robot lower limbs, and there are multiple electrode sheets evenly spaced on the detection robot torso, detection robot lower limbs, detection robot upper limbs, and detection robot head, the electrode sheets are electrically connected to the conductive rings through the wiring structure, the conductive rings are connected to the electrical signals of the detection system inside the detection robot torso through the connecting circuit, and the connecting circuit is controlled to be disconnected and connected through the control system inside the detection robot torso.

[0009] Preferably, a threaded groove is provided at the outer port of the conductive ring, and the wiring structure includes a mounting seat, a piston, a return spring, a pull rod, a force ring, an electrode sheet limit plate and a positioning screw. The mounting seat is composed of a mounting rod, a threaded seat and a positioning head. The mounting rod, the threaded seat and the positioning head are integrally formed. The mounting rod is inserted into the mounting groove, and the threaded seat is screwed into the threaded groove.

[0010] Preferably, a piston groove is formed through the mounting rod, the threaded seat and the positioning head, the piston is movably arranged in the piston groove, the pull rod is fixedly connected to the piston, the force ring is fixedly connected to the end of the pull rod through a connecting rod, the return spring is sleeved on the pull rod, and the two ends of the return spring are respectively fixedly glued to the piston and the force ring.

[0011] Preferably, a screw hole is provided at the outer end of the piston, a docking groove is provided at the port position of the screw hole, a mounting column is integrally formed at the inner end of the electrode sheet limiting plate, a docking seat is integrally formed at the end of the mounting column, a mounting hole is penetrated through the electrode sheet limiting plate, the mounting column and the docking seat, a countersunk hole is provided at the outer end of the mounting hole, and an Allen wrench slot is provided at the outer port of the countersunk hole.

[0012] Preferably, the screw rod of the positioning screw passes through the countersunk hole and the mounting hole and is screwed into the screw hole. The docking groove is a slot structure with a regular hexagonal cross-section. The size of the docking seat matches the size of the docking groove. When the electrode sheet is actually installed, the electrode sheet is sleeved on the mounting column, and the electrode sheet is positioned on the outer wall of the airbag layer by the electrode sheet limiting plate.

[0013] Preferably, when the mounting groove is inflated, the outward expansion distance of the airbag layer matches the outward push distance of the piston, and after the pressure in the mounting groove is released, the piston is completely retracted into the piston groove, and a sealing gasket is provided between the inner side surface of the threaded seat and the bottom of the threaded groove.

[0014] Preferably, a conductive part mounting groove is provided on the outer side wall of the mounting rod, the conductive part mounting groove is aligned with the conductive ring, and a conductive part is soldered in the conductive part mounting groove, the conductive part is in a hexagonal frame structure, and an elastic support part is integrally formed in the inner frame of the conductive part, the conductive ring, the electrode sheet limiting plate, and the mounting column are all cast from copper, and when the mounting column is actually installed, the mounting column is placed in contact with the side wall of the piston groove, and the limb body is cast from insulating material.

[0015] Preferably, the elastic support member is composed of a support tube and a cross support member, the cross support member is integrally formed in the tube cavity of the support tube, and the support tube and the cross support member are both cast from spring steel, and when the elastic support member is in a reset state, the conductive member is stably contacted with the conductive ring.

[0016] Preferably, a positioning ring is integrally formed on the inner side wall of the installation channel, and the positioning ring is a flexible rubber ring. When the threaded seat is actually tightened, the positioning head presses the positioning ring onto the outer side wall of the limb body, and a stabilizing protrusion is integrally formed on the inner side surface of the positioning head.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. A finished product inspection device for antistatic protective clothing processing is provided, which is composed of a detection robot torso, a detection robot lower limb, a detection robot upper limb and a detection robot head, and a plurality of electrode sheets are provided on the outer side of the airbag layer on the detection robot torso, the detection robot lower limb, the detection robot upper limb and the detection robot head, so that the antistatic protective clothing to be inspected is worn on the detection robot, and the airbag layer is inflated so that each electrode sheet can stably contact the antistatic protective clothing to be inspected, and then the electrode sheets are controlled to form a plurality of electrode groups, and each electrode group is tested independently to improve the convenience of the test process, and after the antistatic protective clothing is positioned once, multiple groups of data can be tested, thereby effectively improving the detection accuracy of the antistatic protective clothing;

[0019] 2. By setting a wiring structure composed of a mounting seat, a piston, a return spring, a pull rod, a force ring, an electrode sheet limit plate and a positioning screw, and ensuring that when the mounting groove is inflated, the outward expansion distance of the airbag layer coincides with the outward push distance of the piston, thereby ensuring that the electrode sheet can always be in contact with the outer wall of the airbag layer, thereby effectively preventing the electrode sheet from being damaged and deformed when the antistatic protective clothing is put on and taken off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 A half-section view of the lower limbs of the detection robot of the present invention;

[0022] Figure 3 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0023] Figure 4 for Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0024] Figure 5 This is a schematic diagram of the internal structure of the installation slot of the present invention;

[0025] Figure 6 for Figure 5 A magnified schematic diagram of the structure at C in the middle;

[0026] Figure 7 This is a schematic diagram of the structure of the mounting rod, threaded seat and positioning head of the present invention;

[0027] Figure 8 for Figure 7 A magnified schematic diagram of the structure at D in the middle;

[0028] Fig. 9 A half-section view of the mounting seat of the present invention;

[0029] Fig.10 for Fig. 9 The enlarged schematic diagram of the structure at E in the middle;

[0030] Fig.11 for Fig. 9 A magnified schematic diagram of the structure at F in the middle;

[0031] Fig.12 It is a schematic diagram of the inner structure of the electrode sheet limiting plate;

[0032] Fig.13 It is a schematic diagram of the outer structure of the electrode sheet limiting plate;

[0033] Fig.14 It is a schematic diagram of the conductive member structure of the present invention.

[0034] In the figure: detection robot torso 1, detection robot lower limbs 2, detection robot upper limbs 3, detection robot head 4, limb body 5, airbag layer 6, electrode sheet 7, mounting groove 8, air hole 9, conductive ring 10, threaded groove 11, mounting channel 12, mounting seat 13, piston 14, reset spring 16, pull rod 17, force ring 18, electrode sheet limit plate 19, positioning screw 20, mounting rod 21, threaded seat 22, positioning head 23, piston groove 24, connecting rod 25, screw hole 26, docking groove 27, mounting column 28, docking seat 29, mounting hole 30, countersunk hole 31, hexagonal wrench groove 32, positioning ring 33, conductive part mounting groove 34, conductive part 35, elastic support part 36, support tube 37, cross support part 38, sealing gasket 39, stabilizing protrusion 40. DETAILED DESCRIPTION

[0035] 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.

[0036] See also Figure 1-14 The present invention provides the following three preferred embodiments:

[0037] Embodiment 1: A finished product inspection device for processing antistatic protective clothing, comprising an inspection robot trunk 1, an inspection robot lower limb 2, an inspection robot upper limb 3 and an inspection robot head 4, wherein the inspection robot lower limb 2, the inspection robot upper limb 3 and the inspection robot head 4 are all connected to the inspection robot trunk 1, and the connection structure activity angle of the inspection robot lower limb 2, the inspection robot upper limb 3, the inspection robot head 4 and the inspection robot trunk 1 is the same as the human body joint activity angle, and the inspection robot trunk 1 is provided with a detection system, and the inspection robot lower limb 2 It is composed of a limb body 5, an airbag layer 6 and an electrode sheet 7. A mounting groove 8 is provided on the limb body 5. An air hole 9 is provided at the bottom of the mounting groove 8. The inner port of the air hole 9 and the air inlet of the airbag layer 6 are connected to the micro air pump inside the limb body 5 through an air tube, and an electronic pressure relief valve is connected to the air tube. A conductive ring 10 is integrally formed on the side wall of the air hole 9. The airbag layer 6 is covered and arranged on the outside of the limb body 5. The electrode sheet 7 is arranged on the outer layer of the airbag layer 6, and an installation channel 12 is reserved on the airbag layer 6. The installation channel 12 is arranged corresponding to the mounting groove 8.

[0038] The structural compositions of the detection robot trunk 1, the detection robot upper limbs 3, and the detection robot head 4 are similar to the structural compositions of the detection robot lower limbs 2, and a plurality of electrode sheets 7 are evenly spaced on the detection robot trunk 1, the detection robot lower limbs 2, the detection robot upper limbs 3, and the detection robot head 4, and the electrode sheets 7 are electrically connected to the conductive ring 10 through a wiring structure, and the conductive ring 10 is connected to the detection system electrical signal inside the detection robot trunk 1 through a connecting circuit, and the connecting circuit is controlled to be disconnected and connected through the control system inside the detection robot trunk 1, and a detection robot trunk 1 is provided by setting a detection robot trunk 1, a detection robot lower limb 2, a detection robot upper limb 3, and a detection robot head 4. A finished product inspection device for antistatic protective clothing processing is provided, and a plurality of electrode sheets 7 are arranged on the outer side of the airbag layer 6 on the torso 1, the lower limbs 2, the upper limbs 3 and the head 4 of the inspection robot, so that the antistatic protective clothing to be inspected can be worn on the inspection robot, and the airbag layer 6 is inflated so that each electrode sheet 7 can stably contact the antistatic protective clothing to be inspected, and then the electrode sheets 7 are controlled to form a plurality of electrode groups, and then each electrode group is tested independently to improve the convenience of the test process, and after the antistatic protective clothing is positioned once, multiple groups of data can be tested, thereby effectively improving the detection accuracy of the antistatic protective clothing.

[0039] Embodiment 2: On the basis of embodiment 1, a threaded groove 11 is provided at the outer port of the conductive ring 10, and the wiring structure includes a mounting seat 13, a piston 14, a reset spring 16, a pull rod 17, a force ring 18, an electrode sheet limit plate 19 and a positioning screw 20. The mounting seat 13 is composed of a mounting rod 21, a threaded seat 22 and a positioning head 23. The mounting rod 21, the threaded seat 22 and the positioning head 23 are integrally formed. The mounting rod 21 is inserted into the mounting groove 8, and the threaded seat 22 is screwed into the threaded groove 11. A piston groove 24 is provided through the mounting rod 21, the threaded seat 22 and the positioning head 23. The piston 14 is movably arranged in the piston groove 24. The pull rod 17 is fixedly connected to the piston 14, and the force ring 18 is fixedly connected to the end of the pull rod 17 through the connecting rod 25. The reset spring 16 is sleeved on the pull rod 17, and the two ends of the reset spring 16 are fixedly glued to the piston 14 and the force ring 18 respectively.

[0040] The outer end of the piston 14 is provided with a screw hole 26, and a docking groove 27 is provided at the end position of the screw hole 26. The inner end of the electrode sheet limiting plate 19 is integrally formed with a mounting column 28, and the end of the mounting column 28 is integrally formed with a docking seat 29. The electrode sheet limiting plate 19, the mounting column 28, and the docking seat 29 are penetrated by a mounting hole 30, and the outer end of the mounting hole 30 is provided with a countersunk hole 31, and the outer end of the countersunk hole 31 is provided with an inner hexagonal wrench slot 32, and the screw rod of the positioning screw 20 passes through The countersunk hole 31 and the mounting hole 30 are screwed into the screw hole 26. The docking groove 27 is a notch structure with a regular hexagonal cross-section. The size of the docking seat 29 matches the size of the docking groove 27. The arrangement of the docking seat 29 and the docking groove 27 prevents the threaded seat 22 from being loosened due to direct force on the position of the positioning screw 20 when being screwed. When the electrode sheet 7 is actually installed, the electrode sheet 7 is sleeved on the mounting column 28, and the electrode sheet 7 is positioned on the outer wall of the airbag layer 6 through the electrode sheet limiting plate 19.

[0041] When the mounting groove 8 is inflated, the outward expansion distance of the airbag layer 6 is consistent with the outward push distance of the piston 14, and after the pressure in the mounting groove 8 is released, the piston 14 is completely retracted into the piston groove 24, and a sealing gasket 39 is provided between the inner side surface of the threaded seat 22 and the bottom of the threaded groove 11. By setting a wiring structure composed of a mounting seat 13, a piston 14, a reset spring 16, a pull rod 17, a force ring 18, an electrode plate limit plate 19 and a positioning screw 20, it is ensured that when the mounting groove 8 is inflated, the outward expansion distance of the airbag layer 6 is consistent with the outward push distance of the piston 14, thereby ensuring that the electrode plate 7 can always be in contact with the outer wall of the airbag layer 6, thereby effectively preventing the electrode plate 7 from being damaged and deformed when the anti-static protective clothing is put on and taken off.

[0042] Embodiment 3: On the basis of embodiment 2, a conductive member installation groove 34 is provided on the outer wall of the installation rod 21, and the conductive member installation groove 34 is aligned with the conductive ring 10, and a conductive member 35 is soldered in the conductive member installation groove 34, and the conductive member 35 has a hexagonal frame structure, and an elastic support member 36 is integrally formed in the inner frame of the conductive member 35, and the conductive ring 10, the electrode sheet limiting plate 19, and the installation column 28 are all made of copper casting. When the installation column 28 is actually installed, the installation column 28 and the piston groove 24 are aligned. The side walls are arranged close to each other, the limb body 5 is cast from insulating material, the elastic support member 36 is composed of a support tube 37 and a cross support member 38, the cross support member 38 is integrally formed in the tube cavity of the support tube 37, and the support tube 37 and the cross support member 38 are both cast from spring steel. When the elastic support member 36 is in a reset state, the conductive member 35 is arranged in stable contact with the conductive ring 10, and the elastic support member 36 forms a resisting effect on the conductive member 35 to ensure that the conductive member 35 is in stable contact with the conductive ring 10.

[0043] The inner wall of the installation channel 12 is integrally formed with a positioning ring 33, and the positioning ring 33 is a flexible rubber ring. When the threaded seat 22 is actually tightened, the positioning head 23 presses the positioning ring 33 to position it on the outer wall of the limb body 5. The inner side of the positioning head 23 is integrally formed with a stabilizing protrusion 40. By screwing the threaded seat 22 to position it, the positioning ring 33 can be simultaneously pressed by the positioning head 23 to position the airbag layer 6. The setting of the stabilizing protrusion 40 can be embedded in the positioning ring 33 through the stabilizing protrusion 40, thereby improving the positioning stability of the positioning ring 33.

[0044] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. A finished product detection device for antistatic protective clothing processing, characterized in that: The invention comprises a detection robot trunk (1), a detection robot lower limb (2), a detection robot upper limb (3) and a detection robot head (4); the detection robot lower limb (2), the detection robot upper limb (3) and the detection robot head (4) are all connected to the detection robot trunk (1); and the movable angle of the connection structure between the detection robot lower limb (2), the detection robot upper limb (3), the detection robot head (4) and the detection robot trunk (1) is the same as the movable angle of the human body joints; and a detection system is arranged inside the detection robot trunk (1); The detection robot lower limb (2) is composed of a limb body (5), an airbag layer (6) and an electrode sheet (7). The limb body (5) is provided with a mounting groove (8), and the bottom of the mounting groove (8) is provided with an air hole (9). The inner port of the air hole (9) and the air inlet of the airbag layer (6) are connected to a micro air pump inside the limb body (5) through an air pipe, and the air pipe is connected to an electronic pressure relief valve. A conductive ring (10) is integrally formed on the side wall of the air hole (9). The airbag layer (6) is covered and arranged on the outer side of the limb body (5), and the electrode sheet (7) is arranged on the outer layer of the airbag layer (6). A mounting channel (12) is reserved on the airbag layer (6), and the mounting channel (12) is arranged corresponding to the mounting groove (8).

2. The finished product detection device for antistatic protective clothing processing according to claim 1 is characterized in that: The structural composition of the detection robot trunk (1), the detection robot upper limbs (3), and the detection robot head (4) are similar to the structural composition of the detection robot lower limbs (2), and a plurality of electrode sheets (7) are evenly spaced on the detection robot trunk (1), the detection robot lower limbs (2), the detection robot upper limbs (3), and the detection robot head (4). The electrode sheets (7) are electrically connected to the conductive ring (10) via a wiring structure, and the conductive ring (10) is electrically connected to the detection system inside the detection robot trunk (1) via a connecting circuit, and the connecting circuit is controlled to be disconnected and connected via a control system inside the detection robot trunk (1).

3. The finished product detection device for antistatic protective clothing processing according to claim 2 is characterized in that: A thread groove (11) is provided at the outer end of the conductive ring (10); the wiring structure comprises a mounting seat (13), a piston (14), a return spring (16), a pull rod (17), a force ring (18), an electrode plate limit plate (19) and a positioning screw (20); the mounting seat (13) is composed of a mounting rod (21), a threaded seat (22) and a positioning head (23); the mounting rod (21), the threaded seat (22) and the positioning head (23) are integrally formed; the mounting rod (21) is inserted into the mounting groove (8), and the threaded seat (22) is screwed into the thread groove (11).

4. The finished product detection device for antistatic protective clothing processing according to claim 3 is characterized in that: The mounting rod (21), the threaded seat (22) and the positioning head (23) are provided with a piston groove (24), the piston (14) is movably arranged in the piston groove (24), the pull rod (17) is fixedly connected to the piston (14), the force ring (18) is fixedly connected to the end of the pull rod (17) through a connecting rod (25), the return spring (16) is sleeved on the pull rod (17), and the two ends of the return spring (16) are fixedly glued to the piston (14) and the force ring (18) respectively.

5. The finished product detection device for antistatic protective clothing processing according to claim 4 is characterized in that: The outer end of the piston (14) is provided with a screw hole (26), and a docking groove (27) is provided at the end position of the screw hole (26). The inner end of the electrode plate limiting plate (19) is integrally formed with a mounting column (28), and the end of the mounting column (28) is integrally formed with a docking seat (29). The electrode plate limiting plate (19), the mounting column (28), and the docking seat (29) are penetrated by a mounting hole (30), and a countersunk hole (31) is provided at the outer end of the mounting hole (30), and a hexagonal wrench slot (32) is provided at the outer end of the countersunk hole (31).

6. The finished product detection device for antistatic protective clothing processing according to claim 5 is characterized in that: The screw rod of the positioning screw (20) passes through the countersunk hole (31) and the mounting hole (30) and is screwed into the screw hole (26); the docking groove (27) is a notch structure with a regular hexagonal cross-section; the size of the docking seat (29) matches the size of the docking groove (27); when the electrode sheet (7) is actually installed, the electrode sheet (7) is sleeved on the mounting column (28), and the electrode sheet (7) is positioned on the outer wall of the airbag layer (6) through the electrode sheet limiting plate (19).

7. The finished product detection device for antistatic protective clothing processing according to claim 6 is characterized in that: When the mounting groove (8) is inflated, the outward expansion distance of the airbag layer (6) matches the outward push distance of the piston (14), and after the pressure in the mounting groove (8) is released, the piston (14) is completely retracted into the piston groove (24), and a sealing gasket (39) is provided between the inner side surface of the threaded seat (22) and the bottom of the threaded groove (11).

8. The finished product detection device for antistatic protective clothing processing according to claim 7 is characterized in that: A conductive member installation groove (34) is provided on the outer wall of the installation rod (21), the conductive member installation groove (34) is aligned with the conductive ring (10), and a conductive member (35) is soldered in the conductive member installation groove (34), the conductive member (35) is in a hexagonal frame structure, and an elastic support member (36) is integrally formed in the inner frame of the conductive member (35), the conductive ring (10), the electrode sheet limiting plate (19), and the installation column (28) are all cast from copper, and when the installation column (28) is actually installed, the installation column (28) is arranged to be close to the side wall of the piston groove (24), and the limb body (5) is cast from insulating material.

9. The finished product detection device for antistatic protective clothing processing according to claim 8 is characterized in that: The elastic support member (36) is composed of a support tube (37) and a cross support member (38), the cross support member (38) is integrally formed in the tube cavity of the support tube (37), and the support tube (37) and the cross support member (38) are both cast from spring steel. When the elastic support member (36) is in a reset state, the conductive member (35) is stably contacted with the conductive ring (10).

10. The finished product detection device for antistatic protective clothing processing according to claim 8, characterized in that: The inner wall of the installation channel (12) is integrally formed with a positioning ring (33), and the positioning ring (33) is a flexible rubber ring. When the threaded seat (22) is actually tightened, the positioning head (23) presses the positioning ring (33) onto the outer wall of the limb body (5), and the inner side surface of the positioning head (23) is integrally formed with a stabilizing protrusion (40).

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