Brain natriuretic peptide detection test strip cutting device

Abstract

The utility model provides a brain natriuretic peptide detection test strip cutting device, and relates to the technical field of test strip cutting. Two sets of wall plates are fixed to the fixing frame, a rail plate is installed on the fixing frame through bolts, a middle base is installed on the rail plate through bolts, and lead screws are installed between the two sets of wall plates and the middle base through bearings. The tool apron can be easily moved to a required position only by unscrewing the bolt on the tool apron, after the tool apron is adjusted to a proper position, the blade is stably pressed on a test paper board by extending the third hydraulic rod, the hydraulic driving design ensures the stability and uniformity in the cutting process, and the cutting efficiency is improved. The cutting quality fluctuation caused by non-uniform manual pressure is avoided; the pressing roller is installed between the two sets of side plates through the bearing, the pressing roller exerts proper pressure on a test paper board under the tension effect of the tension spring, it is ensured that the paper board is fully leveled before being cut, and therefore cutting errors caused by unevenness of the paper board are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of test strip cutting, in particular to a test strip cutting device for brain natriuretic peptide detection. Background Art

[0002] Brain natriuretic peptide (BNP) and its precursor, N-terminal pro-brain natriuretic peptide (NT-proBNP), are important biomarkers of cardiac function, playing a key role in the diagnosis and prognosis of heart failure. With the development of immunoassay technology, detection methods for BNP and NT-proBNP have been continuously optimized to improve sensitivity, accuracy, and convenience. Currently, immunochromatographic technology has become one of the mainstream methods for clinical detection of BNP / NT-proBNP. This technology is based on the principle of antigen-antibody specific binding and enables rapid detection via test strips. In immunochromatographic technology, brain natriuretic peptide (BNP) test strips are a fast and simple detection tool that allows medical professionals to perform on-site testing in various clinical settings. However, to ensure the quality and consistency of the test strips, the cutting step in the production process is very critical. Therefore, a brain natriuretic peptide test strip cutting device was designed.

[0003] Traditional cutting methods involve manual cutting or the use of simple mechanical devices. These methods are often inefficient and prone to product defects due to human factors, resulting in waste of raw materials and failing to meet the needs of large-scale production. Utility Model Content

[0004] The disclosed embodiments relate to a brain natriuretic peptide test strip cutting device to address the problems of traditional cutting methods, which rely on manual cutting or the use of simple mechanical devices. These methods are often inefficient and prone to product defects due to human factors, resulting in the waste of raw materials and failing to meet the needs of large-scale production.

[0005] In a first aspect of the present disclosure, a device for cutting a brain natriuretic peptide test strip is provided, specifically comprising: a fixing frame;

[0006] The wheelbase is shortened and the chair folded fork is equipped with a hook portion for adjusting the width of the wheel base and a hook portion for adjusting the position of the wheel base. The hook portion is shortened and the chair folded fork is equipped with a hook portion for adjusting the width of the wheel base. The hook portion is shortened and the chair folded fork is equipped with a hook portion for adjusting the width of the wheel base.

[0007] In at least some embodiments,

[0008] The left end of the fixed frame is fixed with two groups of No. 1 slide seats, and bottom rollers are installed between the two groups of No. 1 slide seats through bearings. The front end of the fixed frame is fixed with a welding seat, and a connecting frame is fixed on the welding seat. A No. 1 gearbox is installed on the connecting frame through bolts, and the output shaft of the No. 1 gearbox is connected with the rotating shaft of the bottom roller. A No. 1 motor is installed at the lower end of the No. 1 gearbox through bolts. No. 1 bearing seats are sliding in the slides of the two groups of No. 1 slide seats, and a top roller is installed between the two groups of No. 1 bearing seats. No. 1 top plates are installed on the upper ends of the two groups of No. 1 slide seats through bolts, and No. 1 hydraulic rods are installed on the No. 1 top plate through bolts, and the piston rod of the No. 1 hydraulic rod is fixedly connected to the No. 1 bearing seat.

[0009] In at least some embodiments,

[0010] Two groups of No. 2 slide seats are fixed on the fixed frame, and No. 1 roller is installed between the two groups of No. 2 slide seats through bearings, No. 2 bearing seats are installed in the slides on the two groups of No. 2 slide seats, and No. 2 rollers are installed between the two groups of No. 2 bearing seats. No. 2 top plates are installed on the upper ends of the two groups of No. 2 slide seats through bolts, and No. 2 hydraulic rods are installed on the No. 2 top plates, and the piston rod of the No. 2 hydraulic rod is fixedly connected to the No. 2 bearing seat.

[0011] In at least some embodiments,

[0012] A fixing rod is fixed in front of the two groups of No. 2 slide seats, and four groups of tool holders are locked on the fixing rod by bolts. A rotating arm is rotated on the tool holder, and a No. 3 hydraulic rod is installed between the rotating arm and the tool holder. A clamping block is installed at the lower end of the rotating arm by bolts, and a blade is clamped between the clamping block and the rotating arm.

[0013] In at least some embodiments,

[0014] Two groups of No. 3 slide seats are fixed on the fixed frame, and No. 3 roller is installed between the two groups of No. 3 slide seats through bearings, and a pulley is fixed to the front end of the rotating shaft of No. 3 roller. No. 3 bearing seats are installed in the slides on the two groups of No. 3 slide seats, and No. 4 roller is installed between the two groups of No. 3 bearing seats. No. 3 top plates are installed on the upper ends of the two groups of No. 3 slide seats through bolts, and No. 4 hydraulic rods are installed on the No. 3 top plates through bolts, and the piston rod of the No. 4 hydraulic rod is fixedly connected to the No. 3 bearing seat.

[0015] In at least some embodiments,

[0016] The fixed frame is equipped with a No. 5 roller via a bearing, a pulley is fixed to the front end of the No. 5 roller, the fixed frame is equipped with a No. 2 gearbox via bolts, a pulley is fixed to the output shaft of the No. 2 gearbox, and the No. 2 motor is equipped with a No. 2 gearbox via bolts.

[0017] In at least some embodiments,

[0018] A movable seat is installed on the fixed frame by bolts, and a waist-shaped groove and a threaded hole are provided on the movable seat. A pulley is installed on the movable seat, and a fixed seat is fixed on the fixed frame. An adjusting screw is installed on the fixed seat, and the adjusting screw is threaded into the threaded hole on the movable seat. A belt is connected between the pulley on the output shaft of the No. 2 gearbox and the pulley on the movable seat, the pulley on the No. 5 roller, and the pulley on the No. 3 roller.

[0019] The utility model provides a brain natriuretic peptide test strip cutting device, which has the following beneficial effects:

[0020] The two sets of sliding seats in the utility model are fixed with brackets, the upper ends of the brackets are hinged with hinged arms, two sets of threaded rods are fixed on the brackets, the two sets of threaded rods are threaded with nuts, the nuts are covered with connecting sleeves, the two sets of connecting sleeves and the hinged arms are connected with tension springs, the hinged arms are equipped with connecting blocks by bolts, the lower ends of the connecting blocks are fixed with top seats, the top seats are equipped with two sets of side plates by bolts, and a pressure roller is installed between the two sets of side plates through bearings. Such a structural design allows the pressure roller to apply appropriate pressure to the test paper cardboard under the tension of the tension spring to ensure that the cardboard is cut The paper is fully leveled before cutting, thus avoiding cutting errors caused by uneven cardboard. By turning the handwheel and nut, the operator can easily adjust the position of the pressure roller and the downward pressure of the pressure roller to adapt to test paper boards of different specifications and thicknesses. This adjustment method is simple and intuitive, without the need for complicated operations or additional tools, greatly improving the ease of use and adaptability of the equipment. This device not only improves the quality of product cutting, but also improves production efficiency, reduces operational difficulty, makes the processing of test paper boards smoother, and ensures the consistency and reliability of the final product.

[0021] In addition, the fixed rod in the present invention is fastened with four sets of knife holders by bolts. A rotating arm is rotatable on the knife holder, and a No. 3 hydraulic rod is installed between the rotating arm and the knife holder. A clamping block is bolted to the lower end of the rotating arm, and a blade is clamped between the clamping block and the rotating arm. The operator can easily move the knife holder to the desired position by simply loosening the bolts on the knife holder. This design not only improves the flexibility of the cutting process but also greatly simplifies the complexity of equipment adjustment. When the knife holder is adjusted to the appropriate position, the No. 3 hydraulic rod is extended to allow the blade to be pressed down smoothly on the test paper cardboard. This hydraulic drive design ensures stability and uniformity during the cutting process and avoids fluctuations in cutting quality caused by uneven manual pressure. In addition, the precise control of the hydraulic rod allows the appropriate pressure to be applied to the blade, ensuring a clean cut while preventing any unnecessary damage to the test paper cardboard. This not only improves cutting accuracy and efficiency, but also ensures the quality of the paper strips, meets the requirements of efficient and precise cutting, avoids waste of raw materials, and can meet the needs of large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly introduced below.

[0023] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0024] In the attached figure:

[0025] Figure 1 A schematic diagram showing the overall structure of the present application;

[0026] Figure 2 Shows the application Figure 1 Schematic diagram of the enlarged structure of part A;

[0027] Figure 3 Shows the application Figure 1 Schematic diagram of the enlarged structure of part B;

[0028] Figure 4 shows a schematic structural diagram of the articulated arm of the present application;

[0029] Figure 5 Shows the application Figure 4 Schematic diagram of the enlarged structure of part C;

[0030] Figure 6 Shows the application Figure 1 Schematic diagram of the enlarged structure of part D;

[0031] Figure 7 A schematic structural diagram of a fixing rod of the present application is shown;

[0032] Figure 8 Shows the application Figure 7 Schematic diagram of the enlarged structure of part E;

[0033] Figure 9 Shows the application Figure 1 Schematic diagram of the enlarged structure of part F.

[0034] Reference Signs List

[0035] 1. Fixed frame; 11. Welding seat; 111. Connecting frame; 12. Gearbox No. 1; 121. Motor No. 1; 13. Slide seat No. 1; 131. Bottom roller; 132. Bearing seat No. 1; 1321. Top roller; 133. Top plate No. 1; 134. Hydraulic rod No. 1; 14. Track plate; 141. Wall plate; 142. Intermediate seat; 143. Screw; 1431. Handwheel; 144. Sliding seat; 145. Bracket; 1451. Threaded rod; 1452. Nut; 1453. Connecting sleeve; 1454. Articulated arm; 1455. Tension spring; 1456. Connecting block; 1457. Top seat; 1458. Side plate; 1459. Press roller; 1 5. Slide seat No. 2; 151. Roller No. 1; 152. Bearing seat No. 2; 1521. Roller No. 2; 1522. Top plate No. 2; 1523. Hydraulic rod No. 2; 153. Fixed rod; 1531. Knife holder; 1532. Rotating arm; 1533. Hydraulic rod No. 3; 1534. Clamping block; 1535. Blade; 16. Slide seat No. 3; 161. Roller No. 3; 162. Bearing seat No. 3; 1621. Roller No. 4; 163. Top plate No. 3; 1631. Hydraulic rod No. 4; 17. Roller No. 5; 18. Movable seat; 181. Fixed seat; 1811. Adjusting screw; 19. Gearbox No. 2; 191. Motor No. 2. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described 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.

[0037] Example 1: Please refer to Figures 1 to 9 :

[0038] The utility model provides a brain natriuretic peptide test strip cutting device, comprising: a fixing frame 1;

[0039] Two sets of wall panels 141 are fixed on the fixing frame 1, and a rail plate 14 is installed on the fixing frame 1 by bolts. An intermediate seat 142 is installed on the rail plate 14 by bolts. A screw rod 143 is installed between the two sets of wall panels 141 and the intermediate seat 142 through bearings. A hand wheel 1431 is fixed on the screw rod 143. Two sets of sliding seats 144 slide on the rail plate 14. The two sets of sliding seats 144 are respectively threaded with the two sets of screw rods 143. A bracket 145 is fixed on the two sets of sliding seats 144. The upper end of the bracket 145 is hinged with a hinged arm 1454. Two groups of threaded rods 1451 are fixed on the bracket 145, and the two groups of threaded rods 1451 are threadedly fitted with nuts 1452, and the nuts 1452 are covered with connecting sleeves 1453. Tension springs 1455 are connected between the two groups of connecting sleeves 1453 and the articulated arms 1454. A connecting block 1456 is installed on the articulated arms 1454 by means of bolts, and a top seat 1457 is fixed to the lower end of the connecting block 1456. Two groups of side plates 1458 are installed on the top seat 1457 by means of bolts, and a pressure roller 1459 is installed between the two groups of side plates 1458 by means of bearings.

[0040] In the embodiment of the present disclosure,

[0041] The left end of the fixed frame 1 is fixed with two groups of No. 1 chute seats 13, and a bottom roller 131 is installed between the two groups of No. 1 chute seats 13 through a bearing. The front end of the fixed frame 1 is fixed with a welding seat 11, and a connecting frame 111 is fixed on the welding seat 11. The No. 1 gearbox 12 is installed on the connecting frame 111 through bolts. The output shaft of the No. 1 gearbox 12 is connected to the rotating shaft of the bottom roller 131. The lower end of the No. 1 gearbox 12 is installed with a No. 1 motor 121 through bolts. The chute of the two groups of No. 1 chute seats 13 There is a No. 1 bearing seat 132 sliding inside, and a top roller 1321 is installed between the two groups of No. 1 bearing seats 132. The upper ends of the two groups of No. 1 slide seats 13 are both installed with No. 1 top plates 133 by bolts. A No. 1 hydraulic rod 134 is installed on the No. 1 top plate 133 by bolts. The piston rod of the No. 1 hydraulic rod 134 is fixedly connected to the No. 1 bearing seat 132. Its function is to press the top roller 1321 down on the bottom roller 131 by extending the No. 1 hydraulic rod 134 to achieve the leveling of the test paper board.

[0042] Example 2, based on Example 1,

[0043] Two groups of No. 2 slide seats 15 are fixed on the fixed frame 1, and a No. 1 roller 151 is installed between the two groups of No. 2 slide seats 15 through a bearing. A No. 2 bearing seat 152 is installed in the slide on the two groups of No. 2 slide seats 15, and a No. 2 roller 1521 is installed between the two groups of No. 2 bearing seats 152. The upper ends of the two groups of No. 2 slide seats 15 are both installed with a No. 2 top plate 1522 by bolts, and a No. 2 hydraulic rod 1523 is installed on the No. 2 top plate 1522. The piston rod of the No. 2 hydraulic rod 1523 is fixedly connected to the No. 2 bearing seat 152. A fixing rod 153 is fixed before the two groups of No. 2 slide seats 15, and four groups of knife seats 1531 are locked on the fixing rod 153 by bolts. The knife seat 15 31 is provided with a rotating arm 1532, and a No. 3 hydraulic rod 1533 is installed between the rotating arm 1532 and the knife holder 1531. The lower end of the rotating arm 1532 is provided with a clamping block 1534 by a bolt, and a blade 1535 is clamped between the clamping block 1534 and the rotating arm 1532. Its function is: by loosening the bolts on the knife holder 1531, the knife holder 1531 can be easily moved to the desired position. This design not only improves the flexibility of the cutting process, but also greatly simplifies the complexity of equipment adjustment. When the knife holder 1531 is adjusted to the appropriate position, the blade 1535 can be steadily pressed down on the test paper cardboard by extending the No. 3 hydraulic rod 1533.

[0044] Example 3, based on Example 1 and Example 2,

[0045] Two groups of No. 3 slide seats 16 are fixed on the fixed frame 1, and No. 3 roller 161 is installed between the two groups of No. 3 slide seats 16 through bearings. A pulley is fixed to the front end of the rotating shaft of No. 3 roller 161, and No. 3 bearing seats 162 are installed in the slides on the two groups of No. 3 slide seats 16. A No. 4 roller 1621 is installed between the two groups of No. 3 bearing seats 162. The upper ends of the two groups of No. 3 slide seats 16 are both installed with No. 3 top plates 163 by bolts, and No. 4 hydraulic rods 1631 are installed on the No. 3 top plates 163 by bolts. The piston rod of the No. 4 hydraulic rod 1631 is fixedly connected to the No. 3 bearing seat 162, and the No. 5 roller 17 is installed on the fixed frame 1 through bearings. A pulley is fixed to the front end of the No. 5 roller 17, and the No. 2 gearbox 19 is installed on the fixed frame 1 by bolts. The No. 2 gearbox 19 A pulley is fixed on the output shaft, a No. 2 motor 191 is installed on the No. 2 gearbox 19 by bolts, a movable seat 18 is installed on the fixed frame 1 by bolts, a waist-shaped groove and a threaded hole are provided on the movable seat 18, a pulley is installed on the movable seat 18, a fixed seat 181 is fixed on the fixed frame 1, an adjusting screw 1811 is installed on the fixed seat 181, and the adjusting screw 1811 is threadedly screwed into the threaded hole on the movable seat 18, and a belt is connected between the pulley on the output shaft of the No. 2 gearbox 19 and the pulley on the movable seat 18, the pulley on the No. 5 roller 17 and the pulley on the No. 3 roller 161. Its function is to run the No. 2 motor 191 to make the belt drive the No. 3 roller 161 and the No. 4 roller 1621 to rotate, so as to facilitate the outward conveying of the cut paper strips.

[0046] The working principle of this embodiment is as follows: when in use, the test paper board is transported to the right from between the top roller 1321 and the bottom roller 131 by running the No. 1 motor 121, and the top roller 1321 is pressed down on the bottom roller 131 by extending the No. 1 hydraulic rod 134 to achieve the flattening of the test paper board. The pressure roller 1459 applies appropriate pressure to the test paper board under the tension of the tension spring 1455 to ensure that the board is fully flattened before cutting. By rotating the hand wheel 1431 and the nut 1452, the operator can easily adjust the position of the pressure roller 1459 and the downward pressure of the pressure roller 1459 to suit the needs of the test paper board. According to the test paper cardboard of different specifications and thicknesses, the bolts on the knife holder 1531 can be loosened to easily move the knife holder 1531 to the required position. This design not only improves the flexibility of the cutting process, but also greatly simplifies the complexity of equipment adjustment. When the knife holder 1531 is adjusted to the appropriate position, the blade 1535 can be pressed down steadily on the test paper cardboard by extending the No. 3 hydraulic rod 1533 to complete the cutting of the test paper cardboard. The No. 2 motor 191 is operated to make the belt drive the No. 3 roller 161 and the No. 4 roller 1621 to rotate, so as to facilitate the outward conveying of the cut paper strips.

[0047] In this article, there are several points to note:

[0048] 1. The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0049] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0050] The above are only specific implementation methods of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this disclosure, and they should all be covered by the protection scope of the present disclosure.

Claims

1. A device for cutting test strips for detecting brain natriuretic peptide, comprising: The fixing frame (1) is characterized in that: Two sets of wall panels (141) are fixed on the fixing frame (1), and a rail plate (14) is installed on the fixing frame (1) by bolts, and an intermediate seat (142) is installed on the rail plate (14) by bolts, and screw rods (143) are installed between the two sets of wall panels (141) and the intermediate seat (142) by bearings, and a hand wheel (1431) is fixed on the screw rod (143), and two sets of sliding seats (144) are slidably provided on the rail plate (14), and the two sets of sliding seats (144) are respectively threadedly matched with the two sets of screw rods (143), and a bracket (145) is fixed on the two sets of sliding seats (144), and the upper end of the bracket (145) is hinged with a hinged arm (145). 4), two groups of threaded rods (1451) are fixed on the bracket (145), and nuts (1452) are threadedly matched on the two groups of threaded rods (1451), and a connecting sleeve (1453) is sleeved on the nut (1452), and a tension spring (1455) is connected between the two groups of connecting sleeves (1453) and the hinged arm (1454), and a connecting block (1456) is installed on the hinged arm (1454) by bolts, and a top seat (1457) is fixed at the lower end of the connecting block (1456), and two groups of side plates (1458) are installed on the top seat (1457) by bolts, and a pressure roller (1459) is installed between the two groups of side plates (1458) through a bearing.

2. A brain natriuretic peptide test strip cutting device according to claim 1, characterized in that: Two groups of No. 1 chute seats (13) are fixed at the left end of the fixing frame (1), and a bottom roller (131) is installed between the two groups of No. 1 chute seats (13) through bearings. A welding seat (11) is fixed to the front end of the fixing frame (1), and a connecting frame (111) is fixed on the welding seat (11). A No. 1 gearbox (12) is installed on the connecting frame (111) through bolts. The output shaft of the No. 1 gearbox (12) is connected to the rotating shaft of the bottom roller (131). The lower end of the No. 1 gearbox (12) is connected through A No. 1 motor (121) is installed with bolts, a No. 1 bearing seat (132) is slid in the slide grooves of the two groups of No. 1 slide groove seats (13), a top roller (1321) is installed between the two groups of No. 1 bearing seats (132), and a No. 1 top plate (133) is installed on the upper ends of the two groups of No. 1 slide groove seats (13) through bolts. A No. 1 hydraulic rod (134) is installed on the No. 1 top plate (133) through bolts, and a piston rod of the No. 1 hydraulic rod (134) is fixedly connected to the No. 1 bearing seat (132).

3. A brain natriuretic peptide test strip cutting device according to claim 2, characterized in that: Two groups of No. 2 chute seats (15) are fixed on the fixed frame (1), a No. 1 roller (151) is installed between the two groups of No. 2 chute seats (15) through a bearing, a No. 2 bearing seat (152) is installed in the chute on the two groups of No. 2 chute seats (15), a No. 2 roller (1521) is installed between the two groups of No. 2 bearing seats (152), and a No. 2 top plate (1522) is installed on the upper end of the two groups of No. 2 chute seats (15) through bolts, a No. 2 hydraulic rod (1523) is installed on the No. 2 top plate (1522), and a piston rod of the No. 2 hydraulic rod (1523) is fixedly connected to the No. 2 bearing seat (152).

4. A brain natriuretic peptide test strip cutting device according to claim 3, characterized in that: A fixing rod (153) is fixed before the two groups of No. 2 slide seats (15), and four groups of knife seats (1531) are locked on the fixing rod (153) by bolts. A rotating arm (1532) is rotated on the knife seat (1531), and a No. 3 hydraulic rod (1533) is installed between the rotating arm (1532) and the knife seat (1531). A clamping block (1534) is installed at the lower end of the rotating arm (1532) by bolts, and a blade (1535) is clamped between the clamping block (1534) and the rotating arm (1532).

5. The brain natriuretic peptide test strip cutting device according to claim 3, characterized in that: Two groups of No. 3 chute seats (16) are fixed on the fixed frame (1), a No. 3 roller (161) is installed between the two groups of No. 3 chute seats (16) through a bearing, a pulley is fixed to the front end of the rotating shaft of the No. 3 roller (161), a No. 3 bearing seat (162) is installed in the chute on the two groups of No. 3 chute seats (16), a No. 4 roller (1621) is installed between the two groups of No. 3 bearing seats (162), a No. 3 top plate (163) is installed on the upper end of the two groups of No. 3 chute seats (16) through bolts, a No. 4 hydraulic rod (1631) is installed on the No. 3 top plate (163) through bolts, and a piston rod of the No. 4 hydraulic rod (1631) is fixedly connected to the No. 3 bearing seat (162).

6. The brain natriuretic peptide test strip cutting device according to claim 5, characterized in that: A fifth roller (17) is mounted on the fixed frame (1) via a bearing, a pulley is fixed to the front end of the fifth roller (17), a second gearbox (19) is mounted on the fixed frame (1) via bolts, a pulley is fixed on the output shaft of the second gearbox (19), and a second motor (191) is mounted on the second gearbox (19) via bolts.

7. A brain natriuretic peptide test strip cutting device according to claim 6, characterized in that: A movable seat (18) is mounted on the fixed frame (1) by bolts, the movable seat (18) is provided with a waist groove and a threaded hole, a pulley is mounted on the movable seat (18), a fixed seat (181) is fixed on the fixed frame (1), an adjusting screw (1811) is mounted on the fixed seat (181), the adjusting screw (1811) is threadedly screwed into the threaded hole on the movable seat (18), and a belt is connected between the pulley on the output shaft of the second gearbox (19), the pulley on the movable seat (18), the pulley on the fifth roller (17), and the pulley on the third roller (161).

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