A double needle cylinder hosiery machine lower needle cylinder clearing structure

Abstract

The utility model provides a kind of double needle cylinder hosiery machine lower needle cylinder loop withdrawal structure, belong to textile machinery technical field.It includes lower needle cylinder seat, and it is equipped with the guide diamond that is triangular on the inner wall of lower needle cylinder seat, and loop withdrawal diamond is equipped with in the side of guide diamond, and loop withdrawal diamond has the loop withdrawal bevel that is adapted with the side of guide diamond, and loop withdrawal diamond is equipped with the loop withdrawal cutter assembly that can be when the front end needle stitch of guide needle piece is displaced out the top of guide diamond, and the front end needle stitch is guided to the loop withdrawal bevel, and it is also equipped with guide cutter assembly in the other side of guide diamond.The front end needle stitch of guide needle piece can be along loop withdrawal bevel without deviation slide, to ensure that guide needle piece can be accurately along loop withdrawal bevel slide down, to ensure the loop withdrawal quality and efficiency of knitting needle;Front end needle stitch can be accurately along the guide displacement of guide diamond to the top of guide diamond, can reduce the defect such as needle missing caused by guide needle piece deviation, to ensure the loop quality of knitting needle.

Description

Technical Field

[0001] This utility model belongs to the field of textile machinery technology and relates to a lower needle cylinder unwinding structure for a double needle cylinder sock machine. Background Technology

[0002] In the knitting process of clogs using a double-cylinder sock knitting machine, the loop removal action is a crucial step that determines the structure and quality of the clogs. Existing double-cylinder sock knitting machines suffer from poor loop removal quality, low efficiency, and a high rate of loop detachment failure, leading to fabric defects. In traditional structures, the movement path of the guide needle plate between the guide triangle and the loop removal component lacks precise control, easily resulting in jamming or delayed action. The guide needle plate cannot accurately move along the preset trajectory, leading to insufficient loop removal or failed loop removal, thus affecting the quality of the socks. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned problems by providing a lower needle cylinder unwinding structure for a double-needle sock machine.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A lower needle cylinder unwinding structure for a double-needle-cylinder sock machine includes a lower needle cylinder seat. A triangular guide rhombus is provided on the inner wall of the lower needle cylinder seat. An unwinding rhombus is provided on one side of the guide rhombus. The unwinding rhombus has an unwinding inclined surface adapted to one side of the guide rhombus. An unwinding knife assembly is provided between the unwinding rhombus and the guide rhombus, which guides the front needle of the guide needle piece to the unwinding inclined surface after it moves out of the top of the guide rhombus. A guide knife assembly is also provided on the other side of the guide rhombus.

[0005] The loop-removing knife assembly guides the front needle of the guide plate to the loop-removing slope of the loop-removing slope after the front needle has moved out of the guide rhombus. This ensures that the front needle slides down the loop-removing slope without deviation, guaranteeing that the guide plate can slide down the loop-removing slope accurately. This ensures the quality and efficiency of loop removal and avoids defects caused by unreleased loops. When the guide plate moves upward under the drive of the jacquard needle, the guide knife assembly guides the front needle of the guide plate to the guide rhombus. This ensures that the front needle can move accurately along the guide rhombus to the top of the guide rhombus. This reduces defects such as missed needles caused by guide plate misalignment, thus ensuring the quality and efficiency of loop formation.

[0006] In the above-mentioned double-cylinder sock machine lower cylinder uncoiling structure, the guide rhombus is provided with guide slopes on both sides, and the tops of the two guide slopes are connected by arc-shaped guide surfaces.

[0007] The front pin can be precisely moved along the guide ramp to the top arc-shaped guide surface. The arc-shaped guide surface provides a smooth movement path for the front pin of the guide pin, which can reduce friction and resistance when the guide pin moves, reduce mechanical wear, and extend the service life of the component.

[0008] In the above-mentioned double-cylinder sock machine lower cylinder unwinding structure, the unwinding knife assembly includes an unwinding knife head disposed between an arc-shaped guide surface and an unwinding inclined surface. The unwinding knife head is connected to an unwinding knife driving mechanism that can drive it to move radially along the lower cylinder seat. An unwinding guide inclined surface structure is provided on the unwinding knife head.

[0009] The loop-removing guide slope structure on the loop-removing cutter head can guide the front needle of the guide needle plate to the loop-removing slope of the loop-removing diamond, which can ensure the accurate movement of the guide needle plate, thereby improving the loop-removing accuracy of the knitting needle and reducing loop failure.

[0010] In the above-mentioned double-cylinder sock machine lower cylinder unwinding structure, the unwinding guide slope structure includes a guide slope set on the unwinding cutter head corresponding to the arc-shaped guide surface. When the front needle foot of the guide needle plate moves out of the arc-shaped guide surface, the guide slope can guide the front needle foot to the unwinding slope.

[0011] The guide slope serves to precisely guide the front needle, ensuring that the needle guide slides down accurately along the loop-removal slope, thereby ensuring the quality of the loop removal.

[0012] In the above-mentioned double-cylinder sock machine lower cylinder unwinding structure, the guide slope is located outside the unwinding slope and closer to the guide rhombus, and an arc-shaped guide surface that cooperates with the unwinding slope is provided at the end of the guide slope.

[0013] The curved guide surface allows the front needle of the needle guide plate to smoothly transition to the loop-out slope, reducing impact and vibration and improving the stability of the needle loop-out action.

[0014] In the above-mentioned double-cylinder sock machine lower cylinder uncoiling structure, the guide knife assembly includes a guide knife head, which is connected to a guide knife drive mechanism that can drive it to move radially along the lower cylinder seat. The guide knife head is provided with a knife head guide structure that can guide the front needle of the guide needle plate to the corresponding guide slope when the guide needle plate moves upward.

[0015] The guide head structure on the guide head can guide the front needle of the guide plate to the corresponding guide slope, so as to ensure that the front needle can accurately move along the guide slope to the top of the guide rhombus, thereby ensuring the knitting needle loop quality.

[0016] In the aforementioned double-cylinder sock machine lower cylinder uncoiling structure, the cutter head guiding structure includes a cutter head guiding slope disposed on the guide cutter head and cooperating with a corresponding guiding slope, and a guide track cooperating with the front needle foot is formed between the cutter head guiding slope and the corresponding guiding slope.

[0017] When the guide needle plate moves upward, it can move along the preset path of the guide rail. The front needle of the guide needle plate will not deviate within the guide rail and can move precisely along the guide slope, thereby ensuring the knitting needle loop quality.

[0018] In the aforementioned double-cylinder sock machine lower cylinder uncoiling structure, the guide cutter head is provided with an arc-shaped relief groove at the beginning of the cutter head guiding slope.

[0019] The arc-shaped relief groove can prevent the front pin of the guide pin from interfering with the guide head when the guide pin moves upward, and can guide the front pin into the guide rail.

[0020] In the aforementioned double-cylinder sock machine's lower cylinder unwinding structure, the bottom of the unwinding rhombus is provided with an unwinding arc surface that communicates with the unwinding inclined surface.

[0021] The uncoiling arc surface is located at the end of the uncoiling slope, allowing the front pin to smoothly enter the uncoiling arc surface. The uncoiling arc surface can reduce the impact and wear on the front pin of the guide pin during the uncoiling process, thus improving the service life of the component.

[0022] In the above-mentioned double-cylinder sock machine lower cylinder unwinding structure, the inner wall of the lower cylinder seat is provided with positioning grooves distributed circumferentially along the inner wall, and the rear ends of the guide rhombus and the unwinding rhombus are respectively provided with arc-shaped positioning blocks adapted to the positioning grooves. The guide rhombus and the unwinding rhombus are connected to the inner wall of the lower cylinder seat by bolts.

[0023] The arc-shaped positioning blocks at the rear ends of the guide rhombus and the retraction rhombus can be inserted into the positioning groove to achieve quick positioning, which can effectively improve the disassembly and assembly efficiency and reduce maintenance and calibration time. The radial installation position of the guide rhombus and the retraction rhombus can be controlled by the cooperation of the arc-shaped positioning block and the positioning groove. The guide rhombus and the retraction rhombus are detachably connected to the lower syringe seat by bolts, which is convenient for disassembly and assembly and easy for maintenance.

[0024] Compared with existing technologies, the advantages of this invention are as follows: 1. By connecting the guide rhombus and the loop-removal rhombus, the guide needle plate displacement path is decomposed into two stages: "loop formation - loop removal," avoiding action delay caused by overload of a single component. 2. The front needle of the guide needle plate can slide down the loop-removal slope without deviation, ensuring that the guide needle plate can accurately slide down the loop-removal slope, thereby ensuring the loop removal quality and efficiency of the knitting needle. 3. The front needle can accurately move along the guide rhombus to the top of the guide rhombus, reducing defects such as missed needles caused by guide needle plate offset, thus ensuring the loop formation quality of the knitting needle. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure provided by this utility model; Figure 2 This is a schematic diagram of the installation of the guide rhombus and the uncoiling rhombus; Figure 3 This is a structural schematic diagram of the decoupling cutter assembly; Figure 4 This is a schematic diagram of the guide knife assembly; Figure 5 This is a schematic diagram of the positioning groove; Figure 6 This is a schematic diagram of the arc-shaped positioning block; Figure 7 This is a schematic diagram of the guide pin structure.

[0026] In the figure, the components are: 1. Lower syringe base; 2. Inner wall; 3. Guide rhombus; 4. Removal rhombus; 5. Removal bevel; 6. Needle guide plate; 7. Front needle foot; 8. Removal knife assembly; 9. Guide bevel; 10. Arc-shaped guide surface; 11. Removal knife head; 12. Removal knife drive mechanism; 13. Removal guide bevel structure; 14. Guide bevel; 15. Arc-shaped guide surface; 16. Guide knife head; 17. Guide knife drive mechanism; 18. Knife head guide structure; 19. Knife head guide bevel; 20. Guide rail; 21. Arc-shaped clearance groove; 22. Removal arc surface; 23. Positioning groove; 24. Arc-shaped positioning block; 25. Detailed Implementation

[0027] like Figures 1-7 As shown, a lower needle cylinder unwinding structure for a double-needle-cylinder sock machine includes a lower needle cylinder seat 1. A triangular guide rhombus 3 is provided on the inner wall 2 of the lower needle cylinder seat 1. An unwinding rhombus 4 is provided on one side of the guide rhombus 3. The unwinding rhombus 4 has an unwinding inclined surface 5 that is adapted to one side of the guide rhombus 3. An unwinding knife assembly 8 is provided between the unwinding rhombus 4 and the guide rhombus 3, which can guide the front needle 7 of the guide needle piece 6 to the unwinding inclined surface 5 after the front needle 7 moves out of the top of the guide rhombus 3. A guide knife assembly 9 is also provided on the other side of the guide rhombus 3.

[0028] In this invention, when the double-cylinder sock machine is running, the lower cylinder seat 1 rotates around the rotating shaft. The guide needle plate 6 rises and moves under the drive of the jacquard needle. As the lower cylinder seat 1 rotates, the front needle foot 7 of the guide needle plate 6 can move along the guide rhombus 3 to the top of the guide rhombus 3. During this process, the guide needle plate 6 drives the knitting needle to rise and complete the loop forming action. When the front needle foot 7 of the guide needle plate 6 moves out to the top of the guide rhombus 3, the loop removal knife assembly 8 intervenes and forcibly guides the front needle foot 7 from the top of the guide rhombus 3 to the loop removal slope 5 of the loop removal rhombus 4. The guide needle plate 6 slides down along the loop removal slope 5 through the front needle foot 7, thereby driving the knitting needle to complete the loop removal action.

[0029] By connecting the guide rhombus 3 and the loop-removal rhombus 4, the shifting path of the guide needle plate 6 is decomposed into two stages: "loop formation - loop removal". This avoids action delay caused by overload of a single component. The loop removal knife assembly 8 can guide the front needle 7 of the guide needle plate 6 to the loop removal slope 5 of the loop removal rhombus 4 after the front needle 7 moves out of the guide rhombus 3. This ensures that the front needle 7 slides down the loop removal slope 5 without deviation, so that the guide needle plate 6 can slide down the loop removal slope 5 accurately. This ensures the quality and efficiency of the loop removal of the knitting needle and avoids defects caused by the loop not falling off. When the guide needle plate 6 moves upward under the drive of the jacquard needle, the guide knife assembly 9 can guide the front needle 7 of the guide needle plate 6 to the guide rhombus 3 to ensure that the front needle 7 can accurately move along the guide rhombus 3 to the top of the guide rhombus 3. This can reduce defects such as missed needles caused by the offset of the guide needle plate 6, so as to ensure the knitting quality and efficiency of the knitting needle.

[0030] Specifically, combining Figures 1-6 As shown, guide slopes 10 are provided on both sides of the guide rhombus 3, and the tops of the guide slopes 10 on both sides are connected by arc-shaped guide surfaces 11.

[0031] When the guide pin 6 rises and shifts, the guide knife assembly 9 can guide the front pin 7 of the guide pin 6 to the guide slope 10 corresponding to the guide rhombus 3. The front pin 7 can accurately move along the guide slope 10 to the top arc-shaped guide surface 11. The arc-shaped guide surface 11 provides a smooth shifting path for the front pin 7 of the guide pin 6, which can reduce friction and resistance when the guide pin 6 moves, reduce mechanical wear, and extend the service life of the component.

[0032] Specifically, combining Figures 1-4 As shown, the uncoiling knife assembly 8 includes an uncoiling knife head 12 disposed between the arc-shaped guide surface 11 and the uncoiling inclined surface 5. The uncoiling knife head 12 is connected to an uncoiling knife drive mechanism 13 that can drive it to move radially along the lower syringe seat 1. An uncoiling guide inclined surface structure 14 is provided on the uncoiling knife head 12.

[0033] The loop-removing cutter head 12 is radially moved along the lower needle cylinder seat 1 by the loop-removing cutter drive mechanism 13. When the knitting needle needs to perform a loop-removing action, the loop-removing cutter drive mechanism 13 drives the loop-removing cutter head 12 to move radially inward along the lower needle cylinder seat 1. The loop-removing guide slope structure 14 on the loop-removing cutter head 12 can guide the front needle foot 7 of the guide needle piece 6 to the loop-removing slope 5 of the loop-removing rhombus 4, which can ensure the accurate movement of the guide needle piece 6, thereby improving the loop-removing accuracy of the knitting needle and reducing loop failure.

[0034] Specifically, combining Figure 3 and Figure 4 As shown, the uncoiling guide slope structure 14 includes a guide slope 15 disposed on the uncoiling cutter head 12 corresponding to the arc-shaped guide surface 11. When the front needle 7 of the guide needle piece 6 moves out of the arc-shaped guide surface 11, the guide slope 15 can guide the front needle 7 to the uncoiling slope 5.

[0035] After the front needle 7 of the guide needle plate 6 moves out of the arc-shaped guide surface 11, it can move along the guide slope 15 to the loop removal slope 5. The guide slope 15 plays the role of accurately guiding the front needle 7 to ensure that the guide needle plate 6 can slide down accurately along the loop removal slope 5, thereby ensuring the loop removal quality of the knitting needle.

[0036] Specifically, combining Figure 3 and Figure 4 As shown, the guide slope 15 is located outside the retraction slope 5 and closer to the guide rhombus 3. At the end of the guide slope 15, there is an arc-shaped guide surface 16 that cooperates with the retraction slope 5.

[0037] The arc-shaped guide surface 16 allows the front needle foot 7 of the guide needle plate 6 to smoothly transition onto the loop-out slope 5, reducing impact and vibration and improving the stability of the loop-out action of the knitting needle.

[0038] Specifically, combining Figures 2-4 As shown, the guide knife assembly 9 includes a guide knife head 17, which is connected to a guide knife drive mechanism 18 that can drive it to move radially along the lower syringe barrel seat 1. The guide knife head 17 is provided with a knife head guide structure 19 that can guide the front end needle 7 of the guide needle plate 6 to the corresponding guide slope 10 when the guide needle plate 6 moves upward.

[0039] The guide cutter head 17 is radially moved along the lower needle cylinder seat 1 by the guide cutter drive mechanism 18. When the guide needle plate 6 is moved upward under the drive of the jacquard needle, the guide cutter drive mechanism 18 drives the guide cutter head 17 to move radially inward along the lower needle cylinder seat 1. The cutter head guide structure 19 on the guide cutter head 17 can guide the front needle foot 7 of the guide needle plate 6 to the corresponding guide slope 10, so as to ensure that the front needle foot 7 can accurately move along the guide slope 10 to the top of the guide rhombus 3, so as to ensure the knitting needle loop quality.

[0040] Specifically, combining Figure 3 and Figure 4 As shown, the cutter head guide structure 19 includes a cutter head guide slope 20 disposed on the guide cutter head 17 and cooperating with the corresponding guide slope 10, and a guide rail 21 cooperating with the front end pin 7 is formed between the cutter head guide slope 20 and the corresponding guide slope 10.

[0041] When the guide needle plate 6 rises and moves, it can move along the preset path of the guide rail 21. The front needle 7 of the guide needle plate 6 will not deviate within the guide rail 21 and can move precisely along the guide slope 10, thereby ensuring the knitting needle loop quality.

[0042] Preferably, combined with Figure 3 and Figure 4 As shown, the guide head 17 has an arc-shaped relief groove 22 at the beginning of the guide slope 20.

[0043] The arc-shaped relief groove 22 can prevent the front needle 7 of the guide needle plate 6 from interfering with the guide cutter head 17 when the guide needle plate 6 rises and shifts, and can guide the front needle 7 into the guide rail 21.

[0044] Specifically, combining Figure 3 and Figure 4 As shown, the bottom of the rhombus 4 has a circular arc surface 23 that is connected to the inclined surface 5.

[0045] The uncoiling arc surface 23 is located at the end of the uncoiling inclined surface 5. The front pin 7 can smoothly enter the uncoiling arc surface 23. The uncoiling arc surface 23 can reduce the impact and wear of the front pin 7 of the guide pin 6 during the uncoiling process and improve the service life of the component.

[0046] Specifically, combining Figures 3-6 As shown, the inner wall 2 of the lower syringe holder 1 is provided with positioning grooves 24 distributed circumferentially along the inner wall 2. The rear ends of the guide rhombus 3 and the retraction rhombus 4 are respectively provided with arc-shaped positioning blocks 25 that are adapted to the positioning grooves 24. The guide rhombus 3 and the retraction rhombus 4 are connected to the inner wall 2 of the lower syringe holder 1 by bolts.

[0047] The arc-shaped positioning block 25 at the rear end of the guide rhombus 3 and the retraction rhombus 4 can be inserted into the positioning groove 24 to achieve quick positioning, which can effectively improve the disassembly and assembly efficiency and reduce maintenance and calibration time. The radial installation position of the guide rhombus 3 and the retraction rhombus 4 can be controlled by the cooperation of the arc-shaped positioning block 25 and the positioning groove 24. The guide rhombus 3 and the retraction rhombus 4 are detachably connected to the lower syringe seat 1 by bolts, which is convenient for disassembly and assembly and easy for maintenance.

[0048] The working principle of this utility model is as follows: When the double needle cylinder sock machine is running, the lower needle cylinder seat 1 rotates around the rotating shaft. When the guide needle plate 6 moves upward under the drive of the jacquard needle, the guide cutter head 17 moves radially inward along the lower needle cylinder seat 1. The front needle foot 7 of the guide needle plate 6 can move along the preset path of the guide rail 21 to the top of the guide rhombus 3. During this process, the guide needle plate 6 drives the knitting needle to rise and complete the looping action. When the knitting needle needs to perform the looping action, the looping cutter head 12 moves radially inward along the lower needle cylinder seat 1. When the front needle foot 7 of the guide needle plate 6 moves out to the top of the guide rhombus 3, it can move along the guide slope 15 and the arc-shaped guide surface 16 of the looping cutter head 12 to the looping slope 5. The guide needle plate 6 slides down along the looping slope 5 through the front needle foot 7, thereby driving the knitting needle to complete the looping action.

[0049] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0050] Although this article frequently uses terms such as lower syringe base 1, inner wall 2, guide rhombus 3, uncoiling rhombus 4, uncoiling bevel 5, guide needle plate 6, front needle foot 7, uncoiling knife assembly 8, guide knife assembly 9, guide bevel 10, arc-shaped guide surface 11, uncoiling knife head 12, uncoiling knife drive mechanism 13, uncoiling guide bevel structure 14, guide bevel 15, arc-shaped guide surface 16, guide knife head 17, guide knife drive mechanism 18, knife head guide structure 19, knife head guide bevel 20, guide rail 21, arc-shaped clearance groove 22, uncoiling arc surface 23, positioning groove 24, arc-shaped positioning block 25, etc., these terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A lower needle cylinder uncoiling structure for a double-needle-cylinder sock knitting machine, comprising a lower needle cylinder seat (1), characterized in that, A triangular guide rhombus (3) is provided on the inner wall (2) of the lower syringe holder (1). A retraction rhombus (4) is provided on one side of the guide rhombus (3). The retraction rhombus (4) has a retraction slope (5) that is adapted to one side of the guide rhombus (3). A retraction knife assembly (8) is provided between the retraction rhombus (4) and the guide rhombus (3) to guide the front needle (7) of the guide needle piece (6) to the retraction slope (5) after the front needle (7) moves out of the top of the guide rhombus (3). A guide knife assembly (9) is also provided on the other side of the guide rhombus (3).

2. The lower cylinder unwinding structure of a double-cylinder sock knitting machine according to claim 1, characterized in that, The guide rhombus (3) is provided with guide slopes (10) on both sides, and the tops of the guide slopes (10) on both sides are connected by arc-shaped guide surfaces (11).

3. The lower cylinder unwinding structure of a double-cylinder sock knitting machine according to claim 2, characterized in that, The uncoiling knife assembly (8) includes an uncoiling knife head (12) disposed between the arc-shaped guide surface (11) and the uncoiling inclined surface (5). The uncoiling knife head (12) is connected to an uncoiling knife drive mechanism (13) that can drive it to move radially along the lower syringe seat (1). An uncoiling guide inclined surface structure (14) is provided on the uncoiling knife head (12).

4. The lower cylinder unwinding structure of a double-cylinder sock knitting machine according to claim 3, characterized in that, The aforementioned uncoiling guide slope structure (14) includes a guide slope (15) on the uncoiling cutter head (12) corresponding to the arc-shaped guide surface (11). When the front needle (7) of the guide needle piece (6) moves out of the arc-shaped guide surface (11), the guide slope (15) can guide the front needle (7) to the uncoiling slope (5).

5. The lower cylinder unwinding structure of a double-cylinder sock knitting machine according to claim 4, characterized in that, The guide slope (15) is located outside the retraction slope (5) and closer to the guide rhombus (3). At the end of the guide slope (15), there is an arc-shaped guide surface (16) that matches the retraction slope (5).

6. The lower cylinder unwinding structure of a double-cylinder sock knitting machine according to claim 2, characterized in that, The guide knife assembly (9) includes a guide knife head (17), which is connected to a guide knife drive mechanism (18) that can drive it to move radially along the lower syringe seat (1). The guide knife head (17) is provided with a knife head guide structure (19) that can guide the front needle foot (7) of the guide needle plate (6) to the corresponding guide slope (10) when the guide needle plate (6) moves upward.

7. The lower cylinder unwinding structure of a double-cylinder sock knitting machine according to claim 6, characterized in that, The cutter head guide structure (19) includes a cutter head guide slope (20) disposed on the guide cutter head (17) and cooperating with the corresponding guide slope (10), and a guide rail (21) cooperating with the front end pin (7) is formed between the cutter head guide slope (20) and the corresponding guide slope (10).

8. The lower cylinder unwinding structure of a double-cylinder sock knitting machine according to claim 7, characterized in that, The guide cutter head (17) is provided with an arc-shaped relief groove (22) at the beginning of the cutter head guide slope (20).

9. A lower needle cylinder unwinding structure for a double-needle-cylinder sock knitting machine according to any one of claims 1-8, characterized in that, The bottom of the aforementioned rhombus (4) is provided with a retraction arc surface (23) that is connected to the retraction inclined surface (5).

10. A lower needle cylinder unwinding structure for a double-needle-cylinder sock knitting machine according to any one of claims 1-8, characterized in that, The lower syringe holder (1) has a positioning groove (24) distributed circumferentially along the inner wall (2) on its inner wall (2). The guide rhombus (3) and the retraction rhombus (4) are respectively provided with arc-shaped positioning blocks (25) that are adapted to the positioning groove (24). The guide rhombus (3) and the retraction rhombus (4) are connected to the inner wall (2) of the lower syringe holder (1) by bolts.

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