Laboratory liquid sampling and mixing device

Abstract

The utility model discloses a laboratory liquid sampling and mixing device and relates to the technical field of mixing devices. The liquid mixing device comprises a machine frame, a liquid mixing tank is detachably installed on the upper surface of the machine frame, a stirring mechanism is arranged on one side of the machine frame, and a fixing mechanism used for fixing the liquid mixing tank is arranged on the surface of the machine frame. The stirring mechanism comprises a hollow rod, an L-shaped fixing frame is fixedly mounted on one side of the rack, the hollow rod penetrates through the L-shaped fixing frame and is rotationally connected with the L-shaped fixing frame, a movable rod is arranged on the inner wall of the hollow rod, and two first sliding grooves are formed in the outer wall of the hollow rod; the movable rod is driven to rotate and vertically ascend and descend in a reciprocating mode, the movable rod enables the stirring shaft and the stirring blades to rotate, meanwhile, the movable rod enables the stirring shaft and the stirring blades to synchronously and vertically ascend and descend in a reciprocating mode, the stirring blades ascend and descend in a reciprocating mode, and a solution in the liquid mixing tank is stirred, so that stirring of the solution is conveniently achieved; furthermore, the stirring effect of the solution is effectively improved, and meanwhile, the operation time of sample mixing and stirring is effectively shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of mixing devices, in particular to a laboratory liquid sampling and mixing device. Background Technique

[0002] The process of preparing a solution with chemicals and solvents into a solution with the required concentration for experiments is called preparing a solution. The preparation of a liquid solution includes basic operations such as calculation of solute, pipetting, and volume fixation, as well as the order of addition of some mixed solutions before and after and the use of the chemical properties of some reagents themselves. However, the existing technologies have the following problems when mixing the samples taken in the laboratory:

[0003] Currently, when the existing technologies mix the samples taken in the laboratory, due to the relatively simple stirring method of their mixing equipment, a large amount of time is required to complete the mixing and stirring of the samples during mixing and stirring, resulting in a longer mixing and stirring time of the samples. At the same time, due to the relatively single stirring method, the mixing and stirring effect of the samples is poor. In view of the above problems, the inventor proposes a laboratory liquid sampling and mixing device to solve the above problems. Content of the Utility Model

[0004] In order to solve the problems of longer mixing and stirring time of the samples and poor mixing and stirring effect of the samples; the purpose of the utility model is to provide a laboratory liquid sampling and mixing device.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a laboratory liquid sampling and mixing device, including a frame, a mixing tank is detachably installed on the upper surface of the frame, a stirring mechanism is arranged on one side of the frame, and a fixing mechanism for fixing the mixing tank is arranged on the surface of the frame;

[0006] The stirring mechanism includes a hollow rod. One side of the frame is fixedly installed with an L-shaped fixing frame. The hollow rod passes through the L-shaped fixing frame and is rotatably connected to the L-shaped fixing frame. An active rod is arranged on the inner wall of the hollow rod. Two first sliding grooves are formed on the outer wall of the hollow rod. The inner walls of the two first sliding grooves are both slidably connected with first sliders. The opposite sides of the two first sliders are fixedly connected to one end of the active rod. The end of the active rod away from the first slider is fixedly installed with a stirring shaft. The end of the stirring shaft away from the active rod is fixedly installed with stirring blades. A moving seat is arranged on one side of the frame. Two guiding grooves are formed on one side of the frame. The inner walls of the two guiding grooves are both slidably connected with guiding blocks. One side of the two guiding blocks is fixedly connected to one side of the moving seat. One side of the moving seat is fixedly installed with a connecting rod. The end of the connecting rod away from the moving seat is fixedly installed with a sleeve. The hollow rod passes through the sleeve. A circular slide rail is fixedly installed on the inner wall of the sleeve. The surface of the circular slide rail is slidably connected with two arc-shaped blocks. One side of the arc-shaped block is fixedly connected to the other side of the first slider. A strip-shaped groove is formed in the inner wall of the moving seat. Two first rotating rods are rotatably installed on one side of the frame. One end of each of the two first rotating rods is fixedly installed with a transmission wheel. A transmission belt is connected between the two transmission wheels. A connecting block is fixedly installed on the outer wall of the transmission belt. One side of the connecting block is fixedly installed with a driving rod. The end of the driving rod away from the connecting block is in movable contact with the inner wall of the strip-shaped groove. A servo motor is fixedly arranged on the upper surface of the L-shaped fixing frame. The driving output end of the servo motor is fixedly installed with a connecting shaft. The end of the connecting shaft away from the servo motor is fixedly connected to one end of the hollow rod. A second rotating rod is arranged on the other side of the frame. Synchronous wheels are fixedly installed at one ends of the connecting shaft and the second rotating rod respectively. A synchronous belt is connected between the two synchronous wheels. Bevel gears are fixedly installed at the other ends of the second rotating rod and one of the first rotating rods respectively. The two bevel gears mesh with each other.

[0007] Preferably, evenly distributed stabilizing seats are fixedly installed on the lower surface of the frame.

[0008] Preferably, a proportioning tank is fixedly installed on the side of the frame close to the liquid mixing tank. A connecting pipe is fixedly installed on the outer wall of the proportioning tank. The end of the connecting pipe away from the proportioning tank is movably inserted into the liquid mixing tank.

[0009] Preferably, a fixing block is fixedly installed on the outer wall of the servo motor. The lower surface of the fixing block is fixedly connected to the upper surface of the L-shaped fixing frame. A support plate is fixedly installed on the other side of the frame. The second rotating rod passes through the support plate and is rotatably connected to the support plate.

[0010] Preferably, the fixing mechanism includes two arc-shaped fixing plates. Anti-slip pads are fixedly installed on the inner walls of the two arc-shaped fixing plates. The inner walls of the two anti-slip pads are in movable contact with the outer wall of the liquid mixing tank. A second sliding groove is formed on the upper surface of the frame. Two second sliders are slidably connected to the inner wall of the second sliding groove. The upper surface of the second slider is fixedly connected to the lower surface of the arc-shaped fixing plate. A double-headed screw rod is rotatably installed on one side of the frame. The double-headed screw rod penetrates through the second sliding groove and is in threaded rotational connection with the two second sliders. A handle is fixedly installed at one end of the double-headed screw rod.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. By placing the liquid mixing tank between the two arc-shaped fixing plates and driving the two arc-shaped fixing plates to move towards each other, the inner walls of the two anti-slip pads are in close contact with the outer wall of the liquid mixing tank. The two arc-shaped fixing plates fix the liquid mixing tank through the two anti-slip pads, thus conveniently realizing the fixation of the liquid mixing tank, and further avoiding the situation that the liquid mixing tank topples during the mixing and stirring operation. At the same time, the stability of the liquid mixing tank during the subsequent mixing and stirring operation is effectively improved;

[0013] 2. By driving the movable rod to rotate and reciprocate vertically, the movable rod makes the stirring shaft and the stirring blades rotate. At the same time, the movable rod makes the stirring shaft and the stirring blades synchronously reciprocate vertically. The stirring blades reciprocate vertically and stir the solution in the liquid mixing tank, thus conveniently realizing the stirring of the solution, and further effectively improving the stirring effect of the solution. At the same time, the operation time of sample mixing and stirring is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0016] Figure 2 For the present utility model Figure 1 An enlarged schematic view of part A in.

[0017] Figure 3 It is a connection schematic diagram of the stirring mechanism of the present utility model.

[0018] Figure 4 For the present utility model Figure 3 An enlarged schematic view of part B in.

[0019] Figure 5 This is a schematic cross-sectional view of the hollow rod and sleeve of the present utility model.

[0020] Figure 6 For the present utility model Figure 5 An enlarged schematic view of part C.

[0021] Figure 7 This is a connection schematic diagram of the fixing mechanism of the present utility model.

[0022] In the figure: 1, frame; 11, stable seat; 2, liquid mixing tank; 3, proportioning tank; 31, connecting pipe; 4, stirring mechanism; 41, hollow rod; 411, L-shaped fixing frame; 42, movable rod; 43, first chute; 44, first slider; 45, stirring shaft; 46, stirring blades; 47, moving seat; 48, guiding groove; 49, guiding block; 5, connecting rod; 51, sleeve; 52, circular slide rail; 53, arc-shaped block; 54, strip-shaped groove; 55, first rotating rod; 56, transmission wheel; 57, transmission belt; 58, connecting block; 59, driving rod; 6, servo motor; 61, fixing block; 62, coupling shaft; 63, second rotating rod; 631, support plate; 64, synchronous wheel; 65, synchronous belt; 66, bevel gear; 7, fixing mechanism; 71, arc-shaped fixing plate; 72, anti-slip pad; 73, second chute; 74, second slider; 75, double-headed screw; 76, handle. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Embodiment: As Figure 1-7 shown, the present utility model provides a laboratory liquid sampling and mixing device, including a frame 1, a liquid mixing tank 2 is detachably installed on the upper surface of the frame 1, a stirring mechanism 4 is provided on one side of the frame 1, and a fixing mechanism 7 for fixing the liquid mixing tank 2 is provided on the surface of the frame 1;

[0025] The stirring mechanism 4 includes a hollow rod 41. An active rod 42 is provided on the inner wall of the hollow rod 41. Two first sliding grooves 43 are formed on the outer wall of the hollow rod 41. First sliders 44 are slidably connected to the inner walls of the two first sliding grooves 43. The opposite sides of the two first sliders 44 are fixedly connected to one end of the active rod 42. A stirring shaft 45 is fixedly installed at the end of the active rod 42 away from the first slider 44. A stirring blade 46 is fixedly installed at the end of the stirring shaft 45 away from the active rod 42. A moving seat 47 is provided on one side of the frame 1. A connecting rod 5 is fixedly installed on one side of the moving seat 47. A sleeve 51 is fixedly installed at the end of the connecting rod 5 away from the moving seat 47. The hollow rod 41 passes through the sleeve 51. A circular sliding rail 52 is fixedly installed on the inner wall of the sleeve 51. Two arc-shaped blocks 53 are slidably connected to the surface of the circular sliding rail 52. One side of the arc-shaped block 53 is fixedly connected to the other side of the first slider 44.

[0026] By adopting the above technical solutions, by arranging the stirring mechanism 4, the stirring mechanism 4 reciprocates up and down to stir the solvent in the mixing tank 2, thereby improving the stirring effect of the solvent. By arranging the fixing mechanism 7, the fixing mechanism 7 facilitates the fixing of the mixing tank 2, thereby improving the stability of the mixing tank 2.

[0027] The lower surface of the frame 1 is fixedly installed with uniformly distributed stable seats 11.

[0028] By adopting the above technical solutions, by arranging the stable seats 11, the stable seats 11 improve the stability of the frame 1.

[0029] A proportioning tank 3 is fixedly installed on one side of the frame 1 close to the mixing tank 2. A connecting pipe 31 is fixedly installed on the outer wall of the proportioning tank 3. One end of the connecting pipe 31 away from the proportioning tank 3 is movably inserted into the mixing tank 2.

[0030] By adopting the above technical solutions, by storing the mixing and stirring water in the proportioning tank 3, it is convenient to add water into the mixing tank 2.

[0031] An L-shaped fixing frame 411 is fixedly installed on one side of the frame 1. The hollow rod 41 passes through the L-shaped fixing frame 411 and is rotatably connected to the L-shaped fixing frame 411.

[0032] By adopting the above technical solutions, by arranging the L-shaped fixing frame 411, the L-shaped fixing frame 411 supports the hollow rod 41.

[0033] Two guiding grooves 48 are formed on one side of the frame 1. Guiding blocks 49 are slidably connected to the inner walls of the two guiding grooves 48. One side of the two guiding blocks 49 is fixedly connected to one side of the moving seat 47.

[0034] By adopting the above technical solution, by providing the guiding groove 48 and the guiding block 49, the guiding block 49 guides the moving seat 47 in the vertical direction, enabling the moving seat 47 to move up and down in the vertical direction.

[0035] A strip-shaped groove 54 is formed in the inner wall of the moving seat 47. Two first rotating rods 55 are rotatably installed on one side of the frame 1. One end of each of the two first rotating rods 55 is fixedly installed with a transmission wheel 56. A transmission belt 57 is connected between the two transmission wheels 56. A connecting block 58 is fixedly installed on the outer wall of the transmission belt 57. One side of the connecting block 58 is fixedly installed with a driving rod 59. The end of the driving rod 59 away from the connecting block 58 is in movable contact with the inner wall of the strip-shaped groove 54.

[0036] By adopting the above technical solution, by driving one of the first rotating rods 55 to rotate, the two first rotating rods 55 cause the transmission belt 57 to transmit through the transmission wheels 56. The transmission belt 57 causes the driving rod 59 to move up and down in the vertical direction along the outer wall of the transmission belt 57 through the connecting block 58. The driving rod 59 causes the moving seat 47 to reciprocate up and down in the vertical direction through the strip-shaped groove 54.

[0037] A servo motor 6 is fixedly provided on the upper surface of the L-shaped fixing frame 411. A coupling 62 is fixedly installed at the driving output end of the servo motor 6. One end of the coupling 62 away from the servo motor 6 is fixedly connected to one end of the hollow rod 41. A second rotating rod 63 is provided on the other side of the frame 1. One end of the coupling 62 and one end of the second rotating rod 63 are both fixedly installed with a synchronous wheel 64. A synchronous belt 65 is connected between the two synchronous wheels 64. The other end of the second rotating rod 63 and the other end of one of the first rotating rods 55 are both fixedly installed with bevel gears 66. The two bevel gears 66 mesh with each other.

[0038] By adopting the above technical solution, by turning on the servo motor 6, the driving shaft of the servo motor 6 causes the coupling 62 to rotate. The coupling 62 causes the stirring shaft 45 and the stirring blades 46 to rotate through the hollow rod 41 and the movable rod 42. The coupling 62 causes the second rotating rod 63 to rotate through the two synchronous wheels 64 and the synchronous belt 65. The second rotating rod 63 causes one of the first rotating rods 55 to rotate through the two meshing bevel gears 66.

[0039] A fixing block 61 is fixedly installed on the outer wall of the servo motor 6. The lower surface of the fixing block 61 is fixedly connected to the upper surface of the L-shaped fixing frame 411. A support plate 631 is fixedly installed on the other side of the frame 1. The second rotating rod 63 passes through the support plate 631 and is rotatably connected to the support plate 631.

[0040] By adopting the above technical solution, by providing the fixing block 61, the fixing block 61 improves the stability of the servo motor 6. By providing the support plate 631, the support plate 631 supports the second rotating rod 63.

[0041] The fixing mechanism 7 includes two arc-shaped fixing plates 71. Anti-slip pads 72 are fixedly installed on the inner walls of the two arc-shaped fixing plates 71. The inner walls of the two anti-slip pads 72 are in movable contact with the outer wall of the liquid mixing tank 2. A second sliding groove 73 is formed on the upper surface of the frame 1. Two second sliding blocks 74 are slidably connected to the inner wall of the second sliding groove 73. The upper surfaces of the second sliding blocks 74 are fixedly connected to the lower surfaces of the arc-shaped fixing plates 71. One side of the frame 1 is rotatably installed with a double-headed screw rod 75. The double-headed screw rod 75 penetrates through the second sliding groove 73 and is in threaded rotational connection with the two second sliding blocks 74. One end of the double-headed screw rod 75 is fixedly installed with a handle 76.

[0042] By adopting the above technical solution, by turning the handle 76, the handle 76 makes the double-headed screw rod 75 rotate. While the double-headed screw rod 75 rotates, it drives the two second sliding blocks 74 to slide towards each other along the inner wall of the second sliding groove 73. The two second sliding blocks 74 make the two arc-shaped fixing plates 71 move towards each other or away from each other. When the two arc-shaped fixing plates 71 move towards each other, the two arc-shaped fixing plates 71 fix the liquid mixing tank 2 through the two anti-slip pads 72.

[0043] Working principle: When it is necessary to mix and stir the sample solution sampled in the laboratory, the experimenter first places the liquid mixing tank 2 between the two arc-shaped fixing plates 71, and horizontally inserts the end of the connecting pipe 31 into the liquid mixing tank 2 (this is the prior art and will not be elaborated here). The proportioning water in the proportioning tank 3 enters the inside of the liquid mixing tank 2 through the connecting pipe 31, and the sampled sample solution is added to the inside of the liquid mixing tank 2;

[0044] Subsequently, the experimenter turns the handle 76. The handle 76 makes the double-headed screw rod 75 rotate. While the double-headed screw rod 75 rotates, it drives the two second sliding blocks 74 to slide towards each other along the inner wall of the second sliding groove 73. The two second sliding blocks 74 make the two arc-shaped fixing plates 71 and the two anti-slip pads 72 move towards each other until the inner walls of the two anti-slip pads 72 are in close contact with the outer wall of the liquid mixing tank 2, and then stop turning the handle 76. The two arc-shaped fixing plates 71 fix the liquid mixing tank 2 through the two anti-slip pads 72, thus conveniently realizing the fixation of the liquid mixing tank 2, and further avoiding the situation that the liquid mixing tank 2 topples during the mixing and stirring operation. At the same time, the stability of the liquid mixing tank 2 during the subsequent mixing and stirring operation is effectively improved;

[0045] Subsequently, the experimenter turns on the servo motor 6. The drive shaft of the servo motor 6 makes the coupling 62 rotate. The coupling 62 makes the stirring shaft 45 and the stirring blades 46 rotate through the hollow rod 41 and the movable rod 42;

[0046] Meanwhile, the coupling shaft 62 drives the second rotating rod 63 to rotate through two synchronous pulleys 64 and a synchronous belt 65. The second rotating rod 63 drives a corresponding first rotating rod 55 to rotate through two meshing bevel gears 66. The two first rotating rods 55 drive the transmission belt 57 to transmit through transmission wheels 56. The transmission belt 57 drives the driving rod 59 to vertically lift along the outer wall of the transmission belt 57. The driving rod 59 drives the moving seat 47 to reciprocate vertically through a strip-shaped groove 54. The moving seat 47 drives the movable rod 42 to reciprocate vertically through a connecting rod 5, a sleeve 51, two arc-shaped blocks 53 and two first sliders 44. Meanwhile, the two first sliders 44 rotate around the axis of the circular slide rail 52 through the two arc-shaped blocks 53, and the two first sliders 44 reciprocate vertically along the inner wall of the first chute 43. The movable rod 42 drives the stirring shaft 45 and the stirring blades 46 to synchronously reciprocate vertically. At this time, the stirring blades 46 reciprocate up and down to stir the solution in the mixing tank 2, thus conveniently realizing the stirring of the solution, effectively improving the stirring effect of the solution, and at the same time, effectively reducing the operation time of sample mixing and stirring.

[0047] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A laboratory liquid sampling and mixing device, comprising a frame (1), characterized in that: The upper surface of the frame (1) is detachably installed with a liquid mixing tank (2). One side of the frame (1) is provided with a stirring mechanism (4), and the surface of the frame (1) is provided with a fixing mechanism (7) for fixing the liquid mixing tank (2). The stirring mechanism (4) includes a hollow rod (41). The inner wall of the hollow rod (41) is provided with a movable rod (42). Two first sliding grooves (43) are opened on the outer wall of the hollow rod (41). The inner walls of the two first sliding grooves (43) are both slidably connected with first sliders (44). The opposite sides of the two first sliders (44) are fixedly connected to one end of the movable rod (42). One end of the movable rod (42) away from the first slider (44) is fixedly installed with a stirring shaft (45). One end of the stirring shaft (45) away from the movable rod (42) is fixedly installed with stirring blades (46). One side of the frame (1) is provided with a moving seat (47). One side of the moving seat (47) is fixedly installed with a connecting rod (5). One end of the connecting rod (5) away from the moving seat (47) is fixedly installed with a sleeve (51). The hollow rod (41) passes through the sleeve (51). The inner wall of the sleeve (51) is fixedly installed with a circular slide rail (52). The surface of the circular slide rail (52) is slidably connected with two arc-shaped blocks (53). One side of the arc-shaped block (53) is fixedly connected to the other side of the first slider (44).

2. The laboratory liquid sampling and mixing device according to claim 1, characterized in that The lower surface of the frame (1) is fixedly installed with evenly distributed stable seats (11).

3. The laboratory liquid sampling and mixing device according to claim 1, characterized in that, One side of the frame (1) close to the liquid mixing tank (2) is fixedly installed with a proportioning tank (3). The outer wall of the proportioning tank (3) is fixedly installed with a connecting pipe (31). One end of the connecting pipe (31) away from the proportioning tank (3) is movably inserted into the liquid mixing tank (2).

4. The laboratory liquid sampling and mixing device according to claim 1, characterized in that, One side of the frame (1) is fixedly installed with an L-shaped fixing frame (411). The hollow rod (41) passes through the L-shaped fixing frame (411) and is rotatably connected to the L-shaped fixing frame (411).

5. The laboratory liquid sampling and mixing device according to claim 1, characterized in that, Two guiding grooves (48) are opened on one side of the frame (1). The inner walls of the two guiding grooves (48) are both slidably connected with guiding blocks (49). One side of the two guiding blocks (49) is fixedly connected to one side of the moving seat (47).

6. The laboratory liquid sampling and mixing device according to claim 1, wherein, A strip-shaped groove (54) is opened in the inner wall of the moving seat (47). Two first rotating rods (55) are rotatably installed on one side of the frame (1). One end of each of the two first rotating rods (55) is fixedly installed with a transmission wheel (56). A transmission belt (57) is connected between the two transmission wheels (56). A connecting block (58) is fixedly installed on the outer wall of the transmission belt (57). One side of the connecting block (58) is fixedly installed with a driving rod (59). One end of the driving rod (59) away from the connecting block (58) is in movable contact with the inner wall of the strip-shaped groove (54).

7. A laboratory liquid sampling and mixing device according to claim 4, characterized in that, A servo motor (6) is fixedly arranged on the upper surface of the L-shaped fixing frame (411). A coupling shaft (62) is fixedly installed at the driving output end of the servo motor (6). One end of the coupling shaft (62) far away from the servo motor (6) is fixedly connected to one end of a hollow rod (41). A second rotating rod (63) is arranged on the other side of the frame (1). Synchronous wheels (64) are fixedly installed at one end of the coupling shaft (62) and one end of the second rotating rod (63). A synchronous belt (65) is drivingly connected between the two synchronous wheels (64). Bevel gears (66) are fixedly installed at the other end of the second rotating rod (63) and the other end of a first rotating rod (55). The two bevel gears (66) are meshed with each other.

8. The laboratory liquid sampling and mixing device according to claim 7, wherein, A fixing block (61) is fixedly installed on the outer wall of the servo motor (6). The lower surface of the fixing block (61) is fixedly connected to the upper surface of the L-shaped fixing frame (411). A support plate (631) is fixedly installed on the other side of the frame (1). The second rotating rod (63) penetrates through the support plate (631) and is rotatably connected to the support plate (631).

9. The laboratory liquid sampling and mixing device according to claim 1, wherein The fixing mechanism (7) includes two arc-shaped fixing plates (71). Anti-slip pads (72) are fixedly installed on the inner walls of the two arc-shaped fixing plates (71). The inner walls of the two anti-slip pads (72) are in movable contact with the outer wall of the liquid mixing tank (2). A second chute (73) is formed on the upper surface of the frame (1). Two second sliders (74) are slidably connected to the inner wall of the second chute (73). The upper surface of the second slider (74) is fixedly connected to the lower surface of the arc-shaped fixing plate (71). A double-headed screw rod (75) is rotatably installed on one side of the frame (1). The double-headed screw rod (75) penetrates through the second chute (73) and is in threaded rotation connection with the two second sliders (74). A handle (76) is fixedly installed at one end of the double-headed screw rod (75).

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