Homogenizer sample container retention bracket

Abstract

The utility model discloses a fixing bracket for a sample container of a homogenizer, which relates to the technical field of quality inspection and comprises a supporting disc, a plurality of pipe holes are formed in the upper edge of the supporting disc, and a plurality of brackets positioned below the pipe holes are arranged on the bottom wall of the supporting disc; a cleaning cylinder located below the cleaning hole is fixed to the bottom wall of the supporting disc, the waste discharge port is connected with a liquid guide pipe, a plugging piece is arranged in the liquid guide pipe, the bottom end of the liquid guide pipe is connected with a waste liquid box, and the height of the supporting disc and the height of the waste liquid box are adjustable. The plugging piece comprises a sliding rod capable of being adjusted in the axial direction of the liquid guide pipe, the upper end of the sliding rod is connected with a rubber plug capable of plugging the waste discharge port, and a pressing disc is rotationally arranged on the upper end face of the rubber plug. According to the device, samples to be homogenized and detected in the centrifugal tubes are supported in batches to be in contact with the tool bit of the homogenizer for homogenizing operation, a detector does not need to hold the centrifugal tubes by hands for homogenizing operation, the tool bit is washed once before each centrifugal tube is changed for homogenizing operation, cross contamination is avoided, the tool bit does not need to be detached when being cleaned, and the device is simple and practical.

Description

Technical Field

[0001] The utility model relates to the technical field of quality inspection, and specifically relates to a fixing bracket for a homogenizer sample container. Background Art

[0002] The IKA homogenizer is a homogenization instrument commonly used in laboratories. The IKA homogenizer crushes samples through a high-speed rotating blade to achieve the purpose of homogenization. This homogenization process is crucial for many laboratory studies, ensuring the uniformity of samples and thus improving the accuracy and reliability of experimental results.

[0003] In use, since only one dispersion cutter head can be installed at a time, only one sample can be processed at a time. Before the homogenization operation, the dispersion cutter head needs to be installed, the fixing knob tightened, and then the sample is homogenized. Before homogenizing the next sample, time is required to disassemble the dispersion cutter head, take a container containing water, a cleaning agent containing a surfactant, or acetonitrile, methanol, etc., and perform a preliminary cleaning of the residue of the previous sample according to the sample homogenization process; during the process of inserting the above dispersion cutter head into different test tubes of samples to be homogenized, time is required to reinstall and fix the cleaned and dried dispersion cutter head and adjust the height, which takes a long time and has low efficiency. Therefore, a fixing bracket for a homogenizer sample container is designed and produced here to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a fixing bracket for a homogenizer sample container to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the utility model provides the following technical solution: A fixing bracket for a homogenizer sample container, comprising:

[0006] A support plate, wherein a plurality of tube holes are provided at the upper edge position of the support plate, the tube holes are used for inserting sample centrifuge tubes, and a plurality of brackets are provided on the bottom wall of the support plate below each tube hole, and the brackets are used for supporting the bottom ends of the sample centrifuge tubes;

[0007] A cleaning hole is further provided at the upper edge position of the support plate, a cleaning cylinder is fixed to the bottom wall of the support plate below the cleaning hole, a waste discharge port is provided at the bottom wall of the cleaning cylinder, and a liquid guide pipe is connected to the waste discharge port. A plugging member is provided in the liquid guide pipe, the bottom end of the liquid guide pipe is connected to a waste liquid box, and the height of the support plate and the waste liquid box can be adjusted;

[0008] The plugging member includes a sliding rod that can be adjusted along the axial direction of the liquid guide pipe. The upper end of the sliding rod is connected to a rubber plug that can block the waste discharge port. A pressing plate is rotatably provided on the upper end surface of the rubber plug. Under normal conditions, the rubber plug is separated from the waste discharge port and is completely located inside the cleaning cylinder, and the waste discharge port is used for the flow of cleaning waste liquid.

[0009] In a further embodiment, a guiding bracket is fixed to the inner radial side wall of the liquid guide tube. The sliding rod has an inverted T-shaped structure. A plug hole for the sliding rod to slide and insert is provided at the center of the guiding bracket. A spring is sleeved on the outer wall of the sliding rod and is located between the guiding frame and the rubber plug. Under normal conditions, the elasticity of the spring bounces the rubber plug off the waste discharge port, and the cleaning cylinder, the liquid guide tube and the waste liquid box are interconnected.

[0010] In a further embodiment, a waste discharge pipe is connected to the radial side wall of the waste discharge box. The inner bottom wall of the waste discharge pipe is flush with the inner bottom wall of the waste liquid box, and a sealing plug is connected to the pipe orifice of the waste discharge pipe.

[0011] In a further embodiment, a frustum-shaped blocking cover is provided on the inner top radial side wall of the cleaning cylinder. The center of the frustum-shaped blocking cover bends downward and extends, and the bottom opening of the frustum-shaped blocking cover is smaller than the top opening of the cleaning cylinder.

[0012] In a further embodiment, the bracket has an inverted U-shaped structure. The two ends of the inverted U-shaped structure are fixedly connected to the bottom wall of the support chassis. Openings coaxial and equally distributed with the tube holes are provided at the bottom end of the inverted U-shaped structure. A rubber sleeve located at the bottom opening of the opening is fixed to the bottom wall of the inverted U-shaped structure. The rubber sleeve has a frustum-shaped hollow structure. The bottom opening of the frustum-shaped hollow structure is smaller than the upper end face opening, and the bottom opening of the rubber sleeve is smaller than the outer diameter of the centrifuge tube. The bottom end of the sample centrifuge tube passes through the opening and is sleeved on the inner side wall of the rubber sleeve.

[0013] In a further embodiment, an adjusting support column is rotatably provided at the bottom end of the waste liquid box. A support sleeve is adjustably provided on the bottom wall of the adjusting support column, and a bottom support is fixed to the bottom end of the support sleeve.

[0014] In a further embodiment, a limiting hole is provided on the radial side wall of the support sleeve. A U-shaped guiding frame is provided on the outer wall of the support sleeve at the opening position of the limiting hole. A pulling rod is slidably inserted into the U-shaped guiding frame. An elliptical elastic ring is fixedly sleeved on the outer wall of one end of the pulling rod located in the inner space of the U-shaped guiding frame. A tooth block is fixed to one end of the pulling rod located in the inner space of the U-shaped guiding frame. A tooth groove with an annular structure is provided on the radial side wall of the adjusting support. The pulling rod slides horizontally on the U-shaped guiding frame, and the tooth block slides synchronously with the pulling rod and is engaged with the tooth groove after passing through the limiting hole.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] The utility model relates to a fixing bracket for a homogenizer sample container, which batch supports the samples to be homogenized in a centrifuge tube to contact with the homogenizer cutter head for homogenization operation. It does not require the tester to hold the centrifuge tube of the sample for homogenization operation, avoiding inaccurate control of the height of the cutter head and the sample liquid level, excessive human factor interference in the homogenization degree of the sample, and easy occurrence of errors in the later data. Before each homogenization operation with a new centrifuge tube, the homogenizer cutter head is washed once in the cleaning cylinder to avoid cross-contamination and deviation in the accuracy of the later experimental data. When cleaning the homogenizer cutter head, it is not necessary to disassemble the cutter head, improving the homogenization efficiency. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the utility model;

[0018] Figure 2 It is a partial cross-sectional view of the support plate and the waste liquid box of an embodiment of the utility model;

[0019] Figure 3 It is an effect diagram of the use of the bracket in an embodiment of the utility model;

[0020] Figure 4 It is a schematic structural diagram of the pull rod in an embodiment of the utility model;

[0021] Figure 5 It is a semi-cross-sectional view of the structure of the cleaning cylinder in an embodiment of the utility model.

[0022] In the figure: 1. Support sleeve; 11. Bottom support; 12. Gate-shaped guide frame; 13. Pull rod; 14. Oval elastic ring; 15. Tooth block; 2. Adjusting support; 3. Waste liquid box; 31. Waste discharge pipe; 32. Liquid guide pipe; 33. Cleaning cylinder; 34. Frustum-shaped blocking cover; 35. Rubber plug; 36. Pressure plate; 37. Slide rod; 38. Guide support; 4. Support plate; 41. Tube hole; 42. Cleaning hole; 43. Bracket; 44. Rubber sleeve. Detailed Embodiment

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the 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 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 work shall fall within the protection scope of the present utility model.

[0024] Embodiment. This embodiment provides a fixing bracket for a homogenizer sample container, including: as Figure 1 , Figure 2 and Figure 3As shown, a support plate 4 is provided with a plurality of tube holes 41 at the upper edge position of the support plate 4, the tube holes 41 are used to insert the sample centrifuge tubes, and a plurality of brackets 43 are provided on the bottom wall of the support plate 4, which are located below each tube hole 41, and the brackets 43 are used to support the bottom end of the sample centrifuge tubes; and the brackets 43 are inverted door-type structures, and the two ends of the inverted door-type structures are fixedly connected to the bottom wall of the support chassis, and the bottom end of the inverted door-type structure is provided with openings that are coaxial with the tube holes 41 and are distributed with equal diameters, and the bottom wall of the inverted door-type structure is fixed with a rubber sleeve 44 located at the bottom end of the opening, and the rubber sleeve 44 is a truncated cone-shaped hollow structure, and the bottom end of the sample centrifuge tube will be wrapped on the inner wall of the rubber sleeve 44 after passing through the opening, and the centrifuge tube is stably set on the support plate 4.

[0025] Normally, the mouth of the centrifuge tube should be positioned 1-2 cm beyond the upper opening of the tube hole 41 to prevent the mouth of the centrifuge tube from falling out of the lower opening of the tube hole 41 .

[0026] And, if Figure 3 As shown, the bottom opening of the truncated cone hollow structure is smaller than the upper end opening, and the bottom opening of the rubber sleeve 44 is smaller than the outer diameter of the centrifuge tube. The advantage of this is that the outer wall of the bottom of the sample centrifuge tube is inserted into the inner side of the rubber sleeve 44 to expand the inner wall of the rubber sleeve 44. The rubber sleeve 44 itself has elastic properties. After the rubber sleeve 44 is inserted into the outer wall of the bottom end of the centrifuge tube, although it is expanded and deformed, the rubber sleeve 44 can be tightly wrapped on the outer wall of the bottom end of the centrifuge tube to prevent the bottom end of the centrifuge tube from sliding out and falling along the bottom opening of the rubber sleeve 44. Even if the centrifuge tube is filled with the sample to be homogenized, the weight of the sample is not enough to press the centrifuge tube down and slip out of the bottom opening of the rubber sleeve 44.

[0027] The bracket 43 of the inverted door structure has a special design, which is convenient for exposing the centrifuge tube portion passing through the tube hole 41 (the centrifuge tube portion located at the bottom end of the support plate 4 and the inner space of the bracket 43) to the operator's field of vision. During homogenization, it is convenient for the operator to clearly see the height of the homogenizer inserted into the centrifuge tube from the bottom of the tube. Generally speaking, the distance from the blade of the homogenizer to the bottom wall of the centrifuge tube cannot be less than 10mm. Of course, in order to prevent the homogenized sample from splashing out of the centrifuge tube mouth, before turning on the homogenizer, it is necessary to ensure that the blade is immersed in the medium to be treated to a depth of 45mm.

[0028] A cleaning hole 42 is also provided at the upper edge of the support plate 4, and a cleaning cylinder 33 located below the cleaning hole 42 is fixed on the bottom wall of the support plate 4. A waste discharge port is provided on the bottom wall of the cleaning cylinder 33, and the waste discharge port is connected to a liquid guide tube 32, and the bottom end of the liquid guide tube 32 is connected to a waste liquid box 3. The cleaning cylinder 33 is used as a place for cleaning the cutter head after homogenization, and the cleaned waste liquid flows into the waste liquid box 3 through the liquid guide tube 32 for collection, and no cleaning liquid after cleaning remains in the cleaning cylinder 33. The cleaning liquid can be selected from water, a mixture containing a surfactant, or a mixture of acetonitrile and methanol. In addition, a waste discharge pipe 31 is connected to the radial side wall of the waste discharge box, and the inner bottom wall of the waste discharge pipe 31 is flush with the inner bottom wall of the waste liquid box 3. A sealing plug is connected to the pipe mouth of the waste discharge pipe 31. When the sealing plug is pulled out, the cleaning waste liquid in the waste liquid box 3 can be discharged through the waste discharge pipe 31. After the sealing plug is plugged, the waste liquid box 3 is used to collect the cleaning waste liquid again.

[0029] The height of the support plate 4 and the waste liquid box 3 can be adjusted; specifically, Figure 1 and Figure 4 As shown, an adjustment pillar 2 is rotatably provided at the bottom end of the waste liquid box 3, and a support sleeve 1 is adjustably provided on the bottom wall of the adjustment pillar 2, and a bottom bracket 11 is fixed at the bottom end of the support sleeve 1. A limit hole is provided on the radial side wall of the support sleeve 1, and a gate-shaped guide frame 12 is provided on the outer wall of the support sleeve 1 at the opening position of the limit hole. A pull rod 13 is slidably inserted into the gate-shaped guide frame 12, and an elliptical elastic ring 14 is fixedly sleeved on the outer wall of one end of the pull rod 13 located in the inner space of the gate-shaped guide frame 12, and a tooth block 15 is fixed on the end of the pull rod 13 located in the inner space of the gate-shaped guide frame 12, and a tooth groove of an annular structure is provided on the radial side wall of the adjustment support, and a pull ring is provided on the end of the pull rod 13 away from the support sleeve 1, and the pull ring is pulled horizontally by hand to move the pull rod 13 along the gate-shaped guide frame 12. For lateral sliding adjustment, the elliptical elastic ring 14 is compressed to generate rebound potential energy. The elliptical elastic ring 14 can be made of a stainless steel elastic ring to drive the tooth block 15 to be pulled out of the limiting hole and disengaged from the tooth groove of the adjusting pillar 2. Then, the adjusting pillar 2 can be slid up and down along the supporting sleeve 1 to adjust the supporting height of the waste liquid box 3 and the supporting plate 4. After the adjustment is completed, the laterally pulled pulling rod 13 is released. Under the elasticity of the elliptical elastic ring 14, the pulling rod 13 drives the tooth block 15 to pass through the limiting hole and get stuck on the tooth groove of the adjusting pillar 2, thereby limiting the support plate 4 and the waste liquid box 3 with adjusted height.

[0030] Before homogenization, first place the bottom tray 11 on the support platform of the homogenizer. Using the support member composed of the adjustment strut 2 and the support sleeve 1, lift the support disk 4 and the waste liquid box 3 off the ground. After the centrifugal tube for the homogenization sample passes through the corresponding tube hole 41, it is placed on the bracket 43. The center of the support disk 4 is offset from the cutter head of the homogenizer. Attention should be paid to the position of the tube hole 41, that is, when the support disk 4 rotates around the center of the disk, each tube hole 41 can rotate in turn under the cutter head of the homogenizer, so as to ensure that the cutter head can extend into the centrifugal tube for homogenization operation later. During homogenization, lift the support disk 4 upward. Without changing the height of the cutter head of the homogenizer, raise the position of the sample centrifugal tube relative to the cutter head of the homogenizer. When the inner bottom wall of the sample centrifugal tube is at the position where the vertical height of the cutter head is 10 mm, stop raising the support disk 4 and start the homogenizer. The homogenizer can drive the cutter head to rotate and homogenize inside the sample centrifugal tube.

[0031] As Figure 5 shown, a plugging member is provided in the liquid guide tube 32. The plugging member includes a slide rod 37 that can be adjusted along the axial direction of the liquid guide tube 32. The upper end of the slide rod 37 is connected with a rubber plug 35 that can plug the waste discharge port. A pressure plate 36 is rotatably provided on the upper end surface of the rubber plug 35. A guide bracket 38 is fixed on the radial side wall inside the liquid guide tube 32. The slide rod 37 has an inverted T-shaped structure. A plugging hole for the slide rod 37 to slide and insert is opened at the center of the guide bracket 38. A spring is sleeved on the outer wall of the slide rod 37 between the guide bracket and the rubber plug 35. Under normal conditions, the elasticity of the spring pops up the rubber plug 35 to separate from the waste discharge port. The cleaning cylinder 33, the liquid guide tube 32 and the waste liquid box 3 are interconnected. As long as the rubber plug 35 separates from the waste discharge port and is completely inside the cleaning cylinder 33, the waste liquid after cleaning in the cleaning cylinder 33 flows through the waste discharge port, through the liquid guide tube 32 and is collected in the waste liquid box 3.

[0032] After homogenization is completed, lower the support disk 4. The cutter head of the homogenizer disengages from the sample centrifugal tube. Rotate the support disk 4 to turn the cleaning cylinder 33 under the cutter head of the homogenizer. Raise the support disk 4 again. When the cleaning cylinder 33 rises relative to the cutter head of the homogenizer and the pressure plate 36 contacts the cutter head of the homogenizer, continue to raise the support disk 4. Since the height of the cutter head of the homogenizer remains unchanged, use the cutter head of the homogenizer to press down the pressure plate 36, and then press the rubber plug 35 below the pressure plate 36 into the waste discharge port to plug the waste discharge port.

[0033] Subsequently, clean cleaning liquid is injected into the cleaning cylinder 33 through the cleaning hole 42. The homogenizer is started, and the cutter head drives the pressure plate 36 to rotate synchronously in the cleaning cylinder 33. During the process of stirring the cleaning liquid, the cleaning liquid rotates in the cleaning cylinder 33 to form a rotating eddy current. The rotational scouring kinetic energy generated by the rotation of the cleaning liquid can effectively wash away the effective components of the sample to be detected adhered to the cutter head during homogenization. After the cutter head is washed, the support plate 4 is lowered, and the cutter head is disengaged from the pressure plate 36. After the cutter head completely disengages from the cleaning port, the cutter head can be dried with a hair dryer or wiped with absorbent paper to prevent the cleaning liquid from adhering to the cutter head, which may cause the sample to be detected to be diluted during the next homogenization operation and affect the detection accuracy. A frustum-shaped blocking cover 34 is provided on the radial side wall at the top inside the cleaning cylinder 33. The center of the frustum-shaped blocking cover 34 bends downward and extends, and the bottom opening of the frustum-shaped blocking cover 34 is smaller than the top opening of the cleaning cylinder 33. The advantage of this design is that during the high-speed rotation of the cutter head, the cleaning liquid will be driven to rotate in the cleaning cylinder 33 to generate an eddy current, and the liquid level at the edge position inside the cleaning cylinder 33 will rise. By setting the frustum-shaped blocking cover 34, a cover is formed inside the upper opening of the cleaning cylinder 33, but it does not affect the insertion of the cutter head into the cleaning cylinder 33, preventing the edge cleaning liquid from overflowing the cleaning cylinder 33 due to too fast rotation speed.

[0034] After the cutter head disengages from the pressure plate 36, under the elastic force of the spring, the rubber plug 35 will be pushed up to disengage from the waste discharge port, and the washing waste liquid in the cleaning cylinder 33 will be discharged into the waste liquid box 3 through the liquid guide pipe 32. When it is full, it can be disposed of by pouring.

[0035] In summary, by batch-supporting the samples to be homogenized and detected in the centrifuge tubes to contact the cutter head of the homogenizer for homogenization operation, there is no need for the tester to hold the sample centrifuge tube for homogenization operation, avoiding the inaccurate control of the height of the cutter head and the sample liquid level, and the excessive human factor interference in the homogenization degree of the sample, which is likely to cause errors in the later data. Moreover, before each change of the centrifuge tube for homogenization operation, the cutter head of the homogenizer is washed once in the cleaning cylinder 33 to avoid cross-contamination and deviation in the accuracy of the later experimental data. When cleaning the cutter head of the homogenizer, there is no need to disassemble the cutter head, improving the homogenization efficiency.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood 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 appended claims and their equivalents.

Claims

1. A homogenizer sample container retaining bracket, characterized in that: include: A support plate (4), wherein a plurality of tube holes (41) are provided at the upper edge of the support plate (4), the tube holes (41) are used to insert sample centrifuge tubes, and a plurality of brackets (43) are provided on the bottom wall of the support plate (4) and are located below each tube hole (41), and the brackets (43) are used to support the bottom end of the sample centrifuge tube; A cleaning hole (42) is also provided at the upper edge of the support plate (4); a cleaning cylinder (33) located below the cleaning hole (42) is fixed to the bottom wall of the support plate (4); a waste discharge port is provided on the bottom wall of the cleaning cylinder (33); the waste discharge port is connected to a liquid guide tube (32); a blocking member is provided in the liquid guide tube (32); a waste liquid box (3) is connected to the bottom end of the liquid guide tube (32); and the heights of the support plate (4) and the waste liquid box (3) are adjustable; The blocking member comprises a slide bar (37) which can be adjusted along the axial direction of the liquid guiding tube (32); the upper end of the slide bar (37) is connected to a rubber plug (35) which can block the waste outlet; a pressure plate (36) is rotatably provided on the upper end surface of the rubber plug (35); under normal conditions, the rubber plug (35) is separated from the waste outlet and completely located inside the cleaning cylinder (33); the waste outlet is used for circulating the cleaning waste liquid.

2. The homogenizer sample container retaining bracket according to claim 1, characterized in that: A guide bracket (38) is fixed to the inner radial side wall of the liquid guiding tube (32); the slide bar (37) is an inverted T-shaped structure; a plug hole for slidingly plugging the slide bar (37) is provided at the center of the guide bracket (38); a spring located between the guide bracket and the rubber plug (35) is sleeved on the outer wall of the slide bar (37); under normal conditions, the elasticity of the spring bounces the rubber plug (35) away from the waste outlet, and the cleaning cylinder (33), the liquid guiding tube (32) and the waste liquid box (3) are connected to each other.

3. The homogenizer sample container retaining bracket according to claim 1, characterized in that: The radial side wall of the waste liquid box (3) is connected to a waste discharge pipe (31), the inner bottom wall of the waste discharge pipe (31) is arranged flush with the inner bottom wall of the waste liquid box (3), and the pipe mouth of the waste discharge pipe (31) is connected to a sealing plug.

4. The homogenizer sample container retaining bracket according to claim 1, characterized in that: A truncated cone-shaped blocking cover (34) is provided on the radial side wall at the top of the cleaning cylinder (33). The center of the truncated cone-shaped blocking cover (34) bends and extends downward, and the bottom opening of the truncated cone-shaped blocking cover (34) is smaller than the top opening of the cleaning cylinder (33).

5. The homogenizer sample container retaining bracket according to claim 1, characterized in that: The bracket (43) is an inverted door-type structure, the two ends of the inverted door-type structure are fixedly connected to the bottom wall of the supporting chassis, the bottom end of the inverted door-type structure is provided with openings coaxial with the tube hole (41) and distributed with equal diameters, the bottom wall of the inverted door-type structure is fixed with a rubber sleeve (44) located at the bottom opening of the opening, the rubber sleeve (44) is a truncated cone-shaped hollow structure, the bottom opening of the truncated cone-shaped hollow structure is smaller than the upper end opening, the bottom opening of the rubber sleeve (44) is smaller than the outer diameter of the centrifuge tube, and the bottom end of the sample centrifuge tube passes through the opening and is wrapped on the inner wall of the rubber sleeve (44).

6. The homogenizer sample container retaining bracket according to any one of claims 1 to 5, characterized in that: The bottom end of the waste liquid box (3) is rotatably provided with an adjustment pillar (2), the bottom wall of the adjustment pillar (2) is adjustably provided with a support sleeve (1), and the bottom end of the support sleeve (1) is fixed with a base (11).

7. The homogenizer sample container retaining bracket according to claim 6, characterized in that: The support sleeve (1) is provided with a limit hole on its radial side wall, and the support sleeve (1) is provided with a door-shaped guide frame (12) on its outer wall, which is located at the opening position of the limit hole. A pulling rod (13) is slidably inserted into the door-shaped guide frame (12). An elliptical elastic ring (14) is fixedly sleeved on the outer wall of one end of the pulling rod (13) located in the inner space of the door-shaped guide frame (12). A tooth block (15) is fixedly installed on one end of the pulling rod (13) located in the inner space of the door-shaped guide frame (12). The adjustment pillar (2) is provided with a tooth groove of an annular structure on its radial side wall. The pulling rod (13) slides laterally along the door-shaped guide frame (12) for adjustment, and the tooth block (15) follows the pulling rod (13) to synchronously slide through the limit hole and then engages in the tooth groove.

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