Human collagen purification device capable of preventing residues from being attached to inner wall

Abstract

The invention belongs to the technical field of purification devices, and discloses a human collagen purification device capable of avoiding residues attached to the inner wall, the human collagen purification device comprises a stirring box, the lower end of the stirring box is provided with a filter box, the left side end of the filter box is provided with a liquid storage box, the right side end of the filter box is connected with a collection box, and the middle part of the stirring box is rotatably connected with a transmission shaft; the outer wall of the upper end of the transmission shaft is connected with a stirring frame, transmission rings penetrate through the upper and lower ends of the transmission shaft, and a stirring plate is connected between the two transmission rings. According to the human-derived collagen purification device capable of preventing the residues from being attached to the inner wall, the multiple sets of arc-shaped stirring plates are arranged and can be matched with the stirring frame in the rotating process, the stirring effect is improved, human-derived collagen in the stirring box can be driven to turn upwards when the stirring plates rotate in the forward direction, and then the stirring uniformity is improved; and meanwhile, residues attached to the inner wall of the stirring box can be hung down during reverse rotating discharging, the discharging thoroughness is improved, and waste is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of purification devices, and in particular to a human collagen purification device that avoids residuals adhering to the inner wall. Background Art

[0002] Human collagen: Human collagen produced by genetic recombination technology replaces natural collagen. Recombinant human collagen is based on the tripeptide repeat sequence characteristics of human type III collagen α1 chain collagen Gly-XY (glycine-XY). A human collagen gene monomer is designed and artificially synthesized. Through a series of in vitro enzyme cleavage and connection, an expression vector containing six tandem human collagen gene monomers in the same direction is constructed, which is transferred into Pichia pastoris and obtained through high-density fermentation, separation and purification. This human collagen has the effect of removing skin wrinkles, including facial wrinkles, wrinkles around the eyes, forehead wrinkles, neck wrinkles, hand wrinkles, and stretch marks. Human collagen needs to be purified using a purification device during the production process.

[0003] However, the existing human collagen purification device for preventing residual adhesion on the inner wall still has certain problems when used:

[0004] There is a collagen ultrafiltration purification device with Chinese patent application number CN202320264574.4, which includes a purification component, which includes a bottom plate, a raw liquid barrel, a filter box, a liquid outlet pipe, a booster pump, a liquid suction pipe, an ultrafiltration barrel, a connecting hose, an annular cover and an ultrafiltration membrane; the bottom of the raw liquid barrel is welded to the left side of the upper surface of the bottom plate, and the lower surface of the filter box is welded to the middle of the upper surface of the bottom plate.

[0005] 1. The existing ultrafiltration purification device cannot control the slow and uniform feeding of raw materials during use, and it is easy to cause accumulation due to excessive feeding speed, which affects the effect of filtration and purification. At the same time, incomplete stirring also affects the purification effect;

[0006] 2. The existing purification device has low filtration efficiency and is easily blocked, which affects the filtration efficiency. At the same time, when the purification material is discharged, the inner wall is easily attached with residues, which is not convenient for processing, and the discharge residues are wasted.

[0007] In view of the above problems, an innovative design was carried out based on the original human collagen purification device to avoid residues adhering to the inner wall. Summary of the invention

[0008] The purpose of the present invention is to provide a human collagen purification device that avoids residues attached to the inner wall, so as to solve the problems mentioned in the above background technology that the existing purification devices have uneven stirring, the feeding speed is not easy to control, which affects the filtering effect and efficiency, and at the same time, residues and adhesion are easy to appear on the inner wall during feeding, and incomplete feeding is easy to cause waste.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a human collagen purification device for preventing residual adherence to the inner wall, comprising a stirring box:

[0010] A filter box is installed at the lower end of the mixing box, and a liquid storage box is installed at the left end of the filter box, and a collection box is conductively connected to the right end of the filter box. A transmission shaft is rotatably connected to the middle of the mixing box, and an outer wall of the upper end of the transmission shaft is connected to a stirring frame. Transmission rings are passed through the upper and lower ends of the transmission shaft, and a stirring plate is connected between the two sets of transmission rings. A power motor is fixed to the upper end of the mixing box, and the lower shaft end of the power motor is fixedly connected to the transmission shaft.

[0011] A filter screen is arranged inside the filter box, and two groups of filter screens are arranged. A sealing tube is fixed on the left end of the mixing box, and a piston is slidably connected inside the sealing tube, and a reciprocating screw rod runs through the middle of the piston;

[0012] A material discharge scraper is fitted on the upper end of the filter screen, and sliding guide rods are penetrated on both sides of the material discharge scraper.

[0013] Preferably, the stirring frames are distributed in an equidistant array, the transmission shaft is fixedly connected to the transmission ring, the stirring plates are distributed in a ring array with the center of the transmission shaft as the axis, and the stirring plates are arc-shaped and fit against the inner wall of the stirring box.

[0014] By adopting the above technical scheme, multiple groups of stirring frames can be driven to rotate synchronously through the transmission shaft, and the stirring frames can be used to stir the human collagen inside the stirring box. At the same time, two groups of transmission rings can drive multiple groups of stirring plates to rotate synchronously when the transmission shaft rotates, thereby stirring the edge of the inner wall of the stirring box. During the rotation, the stirring plates can scrape the inside of the stirring box to avoid adhesion residue.

[0015] Preferably, the lower end of the mixing box is conical in design, and an auger shaft is arranged in the middle of the lower end of the mixing box, a material stripping plate is fixed to the lower end of the transmission ring, and the material stripping plates are distributed in a circular array, and the material stripping plates are in contact with the inner wall of the lower end of the mixing box.

[0016] By adopting the above technical solution, the conical design of the lower end of the mixing box makes it easier for the human collagen inside the mixing box to be discharged more thoroughly. At the same time, when the transmission ring rotates, it can drive the material stripping plate to rotate synchronously, and use the material stripping plate to hang the material on the inner wall of the cone at the lower end of the mixing box, thereby avoiding residue.

[0017] Preferably, the upper end of the filter screen is fitted with the discharge scraper, and the discharge scraper is distributed in an equidistant array, and the discharge scrapers in the arrays on the front and rear sides of the transmission shaft are respectively connected to each other, the two ends of the sliding guide rod are fixedly connected to the inner wall of the filter box, and the sliding guide rod is slidably connected to the discharge scraper, and spring telescopic rods are fixed inside the front and rear sides of the filter box, and the opposite side of the spring telescopic rod is connected to the discharge scraper.

[0018] By adopting the above technical solution, the design of multiple sets of scrapers can accelerate the filtering efficiency of the filter screen during the reciprocating motion, and the sliding guide rod can be used to improve the sliding stability of the scrapers.

[0019] Preferably, the lower end of the transmission shaft extends into the interior of the filter box, and the transmission shaft is rotatably connected to the filter screen, a transmission plate is provided on the upper end of the two groups of filter screens, and the transmission plate is fixedly connected to the transmission shaft, and the transmission plate is designed in an elliptical structure, and the outer wall of the transmission plate is in contact with the unloading scraper, and a through hole is opened at the upper end of the contact position between the filter box and the right side of the filter screen, which is connected to the collection box.

[0020] By adopting the above technical solution, the transmission plate can be driven to rotate synchronously through the transmission shaft, and the transmission plate can drive multiple groups of scrapers to reciprocate back and forth during the rotation process, thereby scraping the human collagen filtered on the filter net, thereby improving the filtration efficiency.

[0021] Preferably, the reciprocating screw is rotatably connected to the inner wall of the sealing tube, and the reciprocating screw is threadedly connected to the piston, the front end of the sealing tube is connected to a liquid outlet one-way valve, and the liquid outlet one-way valve is conductively connected to a first conduit, and the right end of the first conduit extends to the interior of the mixing box, the rear end of the sealing tube is connected to a liquid inlet one-way valve, and the rear end of the liquid inlet one-way valve is connected to a second conduit, and the lower end of the second conduit extends to the interior of the liquid storage tank.

[0022] Preferably, two groups of the liquid outlet one-way valve and the liquid inlet one-way valve are provided, and the liquid outlet one-way valve and the liquid inlet one-way valve are symmetrically distributed at the upper and lower ends of the front and rear sides of the sealing tube.

[0023] By adopting the above technical solution, through the cooperation between the reciprocating screw and the piston, the piston can be driven to reciprocate inside the sealed tube when the reciprocating screw rotates, and the human collagen inside the liquid storage tank can be sucked into the sealed tube by the liquid inlet one-way valve and the second conduit when the piston reciprocates, and the human collagen inside the sealed tube can be transported to the inside of the mixing box in cooperation with the liquid outlet one-way valve and the first conduit.

[0024] Preferably, the upper end of the reciprocating screw is rotatably connected to a first pulley, the upper end of the power motor is connected to a second pulley, and a transmission belt is connected between the first pulley and the second pulley.

[0025] Preferably, an inner ratchet is fixed to the inner wall of the first pulley, a pawl is rotatably connected to the outer wall of the upper end of the reciprocating screw, a return spring is fixed between the end of the pawl and the outer wall of the reciprocating screw, and the pawl is meshingly connected to the inner ratchet.

[0026] By adopting the above technical solution, the second pulley can be driven to rotate by the power motor, and the second pulley can drive the first pulley to rotate by using the transmission belt, and by using the cooperation of the inner ratchet and the pawl, the reciprocating screw can be driven to rotate synchronously when the first pulley rotates forward, and the reciprocating screw will not be driven to rotate when the reciprocating screw rotates reversely.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: the human collagen purification device for avoiding residues attached to the inner wall can cooperate with the stirring frame during the rotation process by providing multiple groups of arc-shaped stirring plates to improve the stirring effect. The stirring plates can drive the human collagen inside the stirring box to flip upward when rotating in the forward direction, thereby improving the stirring uniformity. At the same time, when the material is discharged in the reverse direction, the residues attached to the inner wall of the stirring box can be dropped off, thereby improving the thoroughness of the material discharge and avoiding waste.

[0028] 1. By setting a filtering structure in conjunction with a reciprocating material feeding and shifting plate, the material feeding and shifting plate can be used to shift the human collagen during the filtering and purification process, thereby improving the filtering efficiency and the overall purification efficiency of the human collagen purification device;

[0029] 2. By setting up a piston feeding structure, the reciprocating screw can be used to drive the piston to reciprocate inside the sealed tube, thereby quantitatively delivering human collagen, improving the convenience of operation, and enabling uniform feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a front structural schematic diagram of the present invention;

[0031] Figure 2 It is a side view structural schematic diagram of the present invention;

[0032] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the cross-sectional structure of the mixing box of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the material scraper and the filter screen of the present invention;

[0035] Figure 6 This is a schematic diagram of the sealing tube structure of the present invention;

[0036] Figure 7 This is a schematic diagram of the cross-sectional structure of the sealing tube of the present invention;

[0037] Figure 8 This is a schematic diagram of the transmission shaft and stirring frame structure of the present invention;

[0038] Fig. 9 This is a schematic diagram of the structure of the power motor and the second pulley of the present invention;

[0039] Fig.10 It is a schematic diagram of the ratchet and pawl structure of the present invention.

[0040] In the figure: 1, mixing box; 2, filter box; 3, liquid storage box; 4, collecting box; 5, transmission shaft; 6, stirring frame; 7, transmission ring; 8, stirring plate; 9, auger shaft; 10, material removal plate; 11, filter screen; 12, sealing tube; 13, piston; 14, reciprocating screw; 15, liquid outlet check valve; 16, first conduit; 17, liquid inlet check valve; 18, second conduit; 19, first pulley; 20, inner ratchet; 21, ratchet; 22, reset spring; 23, second pulley; 24, transmission belt; 25, sliding guide rod; 26, unloading scraper; 27, spring telescopic rod; 28, transmission plate; 29, power motor. DETAILED DESCRIPTION

[0041] 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.

[0042] See also Figure 1-10The present invention provides a technical solution: a human collagen purification device to avoid residual adhesion to the inner wall, comprising a stirring box 1, a filter box 2 is installed at the lower end of the stirring box 1, and a liquid storage box 3 is installed at the left end of the filter box 2, and a collection box 4 is conductively connected to the right end of the filter box 2, a transmission shaft 5 is rotatably connected to the middle part of the stirring box 1, and the outer wall of the upper end of the transmission shaft 5 is connected to a stirring frame 6, a transmission ring 7 is passed through the upper and lower ends of the transmission shaft 5, and a stirring plate 8 is connected between the two groups of transmission rings 7, a power motor 29 is fixed to the upper end of the stirring box 1, and the lower shaft end of the power motor 29 is fixedly connected to the transmission shaft 5; the stirring frames 6 are distributed in an equidistant array, the transmission shaft 5 is fixedly connected to the transmission ring 7, the stirring plates 8 are distributed in a ring array with the center of the transmission shaft 5 as the axis, and the stirring plates 8 are designed in an arc shape, and the stirring plates 8 fit the inner wall of the stirring box 1; the lower end of the stirring box 1 is designed in a conical shape, and An auger shaft 9 is arranged in the middle of the lower end of the mixing box 1, and a material stripping plate 10 is fixed at the lower end of the lower transmission ring 7, and the material stripping plate 10 is distributed in a ring array, and the material stripping plate 10 is in contact with the inner wall of the lower end of the mixing box 1; the transmission shaft 5 can be driven to rotate by the power motor 29, and when the transmission shaft 5 rotates, it drives multiple groups of stirring frames 6 and two groups of transmission rings 7 to rotate, and the transmission ring 7 is used to drive the stirring plate 8 to rotate synchronously, so as to stir the human collagen inside the mixing box 1, and when the stirring plate 8 rotates forward, the human collagen inside can be flipped upward, so as to improve the stirring effect and the uniformity of stirring, and when the transmission shaft 5 rotates reversely, the auger shaft 9 and the inner wall of the mixing box 1 can be used for quantitative feeding, and when the stirring plate 8 rotates reversely, the human collagen attached to and remaining on the inner wall of the mixing box 1 can be hung down, so as to avoid the situation that the feeding is not completely discharged and waste is generated.

[0043] A sealing tube 12 is fixed to the left end of the mixing box 1, and a piston 13 is slidably connected inside the sealing tube 12, and a reciprocating screw 14 runs through the middle of the piston 13; the reciprocating screw 14 is rotatably connected to the inner wall of the sealing tube 12, and the reciprocating screw 14 is threadedly connected to the piston 13, a liquid outlet check valve 15 is connected to the front end of the sealing tube 12, and the liquid outlet check valve 15 is conductively connected to a first conduit 16, and the right end of the first conduit 16 extends to the inside of the mixing box 1, a liquid inlet check valve 17 is connected to the rear end of the sealing tube 12, and the rear end of the liquid inlet check valve 17 is connected to the second conduit 1 8, and the lower end of the second conduit 18 extends to the inside of the liquid storage tank 3; two groups of liquid outlet check valves 15 and liquid inlet check valves 17 are provided, and the liquid outlet check valves 15 and the liquid inlet check valves 17 are symmetrically distributed at the upper and lower ends of the front and rear sides of the sealing tube 12; the upper end of the reciprocating screw rod 14 is rotatably connected to the first pulley 19, the upper end of the power motor 29 is connected to the second pulley 23, and a transmission belt 24 is connected between the first pulley 19 and the second pulley 23; an inner ratchet 20 is fixed to the inner wall of the first pulley 19, and a ratchet 2 is rotatably connected to the outer wall of the upper end of the reciprocating screw rod 14 1, a return spring 22 is fixed between the end of the pawl 21 and the outer wall of the reciprocating screw 14, and the pawl 21 is meshed and connected with the inner ratchet 20; when the power motor 29 rotates, it can drive the second pulley 23 at its upper end to rotate synchronously, and the second pulley 23 drives the first pulley 19 to rotate by means of the transmission belt 24, and the inner ratchet 20 inside the first pulley 19 rotates synchronously, and the inner ratchet 20 cooperates with the pawl 21 when rotating forward, driving the reciprocating screw 14 to rotate synchronously, and when the reciprocating screw 14 rotates, it can drive the piston 13 to reciprocate inside the sealing tube 12 The liquid inlet one-way valve 17 and the second conduit 18 are used to suck the collagen in the liquid storage tank 3 into the sealed tube 12, and then the liquid outlet one-way valve 15 and the first conduit 16 are used to transport the collagen in the sealed tube 12 to the mixing box 1, so that the collagen can be discharged quantitatively and uniformly. At the same time, the cooperation of the two groups of liquid inlet one-way valves 17 and the liquid outlet one-way valves 15 can intermittently feed the material during the movement of the piston 13, and the cooperation of the inner ratchet 20 and the pawl 21 can prevent the quantitative feeding structure from being driven when the power motor 29 rotates in the opposite direction.

[0044] A filter screen 11 is provided inside the filter box 2, and two groups of filter screens 11 are provided. A material discharge scraper 26 is fitted on the upper end of the filter screen 11, and sliding guide rods 25 are passed through both sides of the material discharge scraper 26; the upper end of the filter screen 11 is fitted with the material discharge scraper 26, and the material discharge scraper 26 is distributed in an equidistant array, and the material discharge scrapers 26 in the arrays on the front and rear sides of the transmission shaft 5 are respectively connected to each other, and the two ends of the sliding guide rod 25 are fixedly connected to the inner wall of the filter box 2, and the sliding guide rod 25 is slidably connected to the material discharge scraper 26, and a spring telescopic rod 27 is fixed inside the front and rear sides of the filter box 2, and the opposite side of the spring telescopic rod 27 is connected to the material discharge scraper 26; the lower end of the transmission shaft 5 extends into the interior of the filter box 2, and the transmission shaft 5 is rotatably connected to the filter screen 11, and a transmission plate 28 is provided on the upper ends of the two groups of filter screens 11, and the transmission plate 28 is fixedly connected to the transmission shaft 5, and the transmission plate 28 is designed in an elliptical structure, and the outer wall of the transmission plate 28 is in contact with the material discharge scraper 26, A through hole is provided at the upper end of the contact position between the filter box 2 and the right side of the filter screen 11, which is connected to the collection box 4; when in use, when the transmission shaft 5 drives the auger shaft 9 to rotate in the opposite direction to discharge the material, two groups of filter screens 11 are used for multi-stage filtration, and the filtered residue can flow into the collection box 4 through the inclined filter screen 11, and the transmission plate 28 can be driven to rotate synchronously during the rotation of the transmission shaft 5. The elliptical transmission plate 28 can drive the discharge scrapers 26 on both sides to reciprocate back and forth during the rotation, thereby moving the collagen raw material on the upper end of the filter screen 11, thereby improving the filtration efficiency. The discharge scrapers 26 distributed on both sides of the transmission shaft 5 are connected to each other and can move synchronously. In conjunction with the design of the spring telescopic rod 27, after the transmission plate 28 rotates and pushes the activity, the transmission plate 28 can push the discharge scraper 26 to reset when it continues to rotate. At the same time, the design of the sliding guide rod 25 passing through both ends of the discharge scraper 26 can improve the activity stability of the discharge scraper 26.

[0045] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the present invention have been shown and described, it is understood by ordinary technicians in the field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A human collagen purification device for preventing residual adhesion to the inner wall, comprising a stirring box (1), characterized in that: A filter box (2) is installed at the lower end of the mixing box (1), and a liquid storage box (3) is installed at the left end of the filter box (2), and a collection box (4) is conductively connected to the right end of the filter box (2); a transmission shaft (5) is rotatably connected to the middle part of the mixing box (1), and an outer wall of the upper end of the transmission shaft (5) is connected to a stirring frame (6); transmission rings (7) pass through the upper and lower ends of the transmission shaft (5), and a stirring plate (8) is connected between the two sets of transmission rings (7); a power motor (29) is fixed to the upper end of the mixing box (1), and the lower shaft end of the power motor (29) is fixedly connected to the transmission shaft (5); The filter box (2) is provided with a filter screen (11) in two groups, the left end of the mixing box (1) is fixed with a sealing tube (12), the sealing tube (12) is slidably connected with a piston (13), and a reciprocating screw rod (14) penetrates the middle of the piston (13); A material discharge scraper (26) is disposed on the upper end of the filter screen (11), and sliding guide rods (25) penetrate through both sides of the material discharge scraper (26).

2. A human collagen purification device for preventing residue from adhering to the inner wall according to claim 1, characterized in that: The stirring racks (6) are distributed in an equidistant array, the transmission shaft (5) is fixedly connected to the transmission ring (7), the stirring plates (8) are distributed in a ring array with the center of the transmission shaft (5) as the axis, and the stirring plates (8) are designed in an arc shape, and the stirring plates (8) are in contact with the inner wall of the stirring box (1).

3. A human collagen purification device for preventing residue from adhering to the inner wall according to claim 2, characterized in that: The lower end of the mixing box (1) is designed to be conical, and a screw shaft (9) is arranged in the middle of the lower end of the mixing box (1). A material-pickup plate (10) is fixed to the lower end of the transmission ring (7) at the lower end, and the material-pickup plates (10) are distributed in a ring array, and the material-pickup plates (10) are in contact with the inner wall of the lower end of the mixing box (1).

4. The human collagen purification device for preventing residue from adhering to the inner wall according to claim 1, characterized in that: The upper end of the filter screen (11) is fitted with a material discharge scraper (26), and the material discharge scraper (26) is distributed in an equidistant array, and the material discharge scrapers (26) in the arrays on the front and rear sides of the transmission shaft (5) are respectively connected to each other, the two ends of the sliding guide rod (25) are fixedly connected to the inner wall of the filter box (2), and the sliding guide rod (25) is slidably connected to the material discharge scraper (26), and a spring telescopic rod (27) is fixed inside the front and rear sides of the filter box (2), and the opposite side of the spring telescopic rod (27) is connected to the material discharge scraper (26).

5. The human collagen purification device for preventing residual adhesion to the inner wall according to claim 4, characterized in that: The lower end of the transmission shaft (5) extends into the interior of the filter box (2), and the transmission shaft (5) is rotatably connected to the filter screen (11). A transmission plate (28) is provided at the upper end of the two groups of filter screens (11), and the transmission plate (28) is fixedly connected to the transmission shaft (5). The transmission plate (28) is designed in an elliptical structure, and the outer wall of the transmission plate (28) is in contact with the unloading scraper (26). A through hole is provided at the upper end of the right contact position between the filter box (2) and the filter screen (11) to communicate with the collection box (4).

6. The human collagen purification device for preventing residue from adhering to the inner wall according to claim 1, characterized in that: The reciprocating screw rod (14) is rotatably connected to the inner wall of the sealing tube (12), and the reciprocating screw rod (14) is threadedly connected to the piston (13); the front end of the sealing tube (12) is connected to a liquid outlet check valve (15), and the liquid outlet check valve (15) is conductively connected to a first conduit (16), and the right end of the first conduit (16) extends to the inside of the mixing box (1); the rear end of the sealing tube (12) is connected to a liquid inlet check valve (17), and the rear end of the liquid inlet check valve (17) is connected to a second conduit (18), and the lower end of the second conduit (18) extends to the inside of the liquid storage tank (3).

7. The human collagen purification device for preventing residue from adhering to the inner wall according to claim 6, characterized in that: The liquid outlet one-way valve (15) and the liquid inlet one-way valve (17) are each provided with two groups, and the liquid outlet one-way valve (15) and the liquid inlet one-way valve (17) are symmetrically distributed at the upper and lower ends of the front and rear sides of the sealing tube (12).

8. The human collagen purification device for preventing residue from adhering to the inner wall according to claim 1, characterized in that: The upper end of the reciprocating screw rod (14) is rotatably connected to a first belt pulley (19), the upper end of the power motor (29) is connected to a second belt pulley (23), and a transmission belt (24) is connected between the first belt pulley (19) and the second belt pulley (23).

9. The human collagen purification device for preventing residue from adhering to the inner wall according to claim 8, characterized in that: An inner ratchet (20) is fixed on the inner wall of the first pulley (19), a pawl (21) is rotatably connected to the outer wall of the upper end of the reciprocating screw rod (14), a return spring (22) is fixed between the end of the pawl (21) and the outer wall of the reciprocating screw rod (14), and the pawl (21) is meshedly connected to the inner ratchet (20).

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