Vibration screening machine for cat litter preparation

Abstract

The invention discloses a vibration screening machine for cat litter preparation, and belongs to the technical field of cat litter preparation. The vibration screening machine comprises a screening box, supporting legs are arranged at the corners of the lower end of the screening box, a fine screening plate is arranged at the lower end of the interior of the screening box, a coarse screening plate is arranged at the upper end of the interior of the screening box, and a first discharging opening is formed in the lower end of one side of the screening box; according to the vibrating screening machine for preparing the cat litter, the screening plate vibrating mechanism is arranged, so that the problem that vibration of screening plates in a traditional vibrating screening machine for preparing the cat litter is not synchronous is effectively solved, the vibrating assembly drives a first cam and a second cam through a first motor, and therefore the vibrating screening machine for preparing the cat litter is convenient to operate. Through transmission of the synchronous belt and the synchronous wheel, it is ensured that the fine sieve plate and the coarse sieve plate can vibrate synchronously, cat litter is evenly distributed on the sieve plates, the screening efficiency and quality are improved, the cat litter production efficiency and product quality are remarkably improved, and the requirement of the market for high-quality cat litter is met.

Description

Technical Field

[0001] The invention belongs to the technical field of cat litter preparation, and particularly relates to a vibrating screening machine for preparing cat litter. Background Art

[0002] A vibrating screening machine for cat litter production is a device used to screen cat litter particles during the production process. It vibrates the litter across the screen plate, separating particles of varying sizes to meet market quality requirements. This equipment is widely used in the pet product manufacturing industry and plays a significant role in improving cat litter production efficiency and product quality. A typical vibrating screening machine for cat litter production consists of a screen box, screen plate, vibrating motor, and support device. The vibrating motor drives the screen plate within the screen box to vibrate, thereby screening the litter.

[0003] However, the existing vibrating screening machine for preparing cat litter has some shortcomings in actual use. First, the vibration mechanism design of the traditional vibrating screening machine is not reasonable enough, which makes it impossible for the two sets of screen plates to achieve synchronous vibration. This makes it easy for the cat litter to be unevenly screened and inefficient during the screening process, affecting the production quality and production efficiency of the cat litter; secondly, the existing screening machine lacks an effective discharging mechanism, and the cat litter remaining on the screen plate is difficult to clean, requiring frequent manual intervention, which not only increases labor intensity, but may also lead to inaccurate cat litter classification, further affecting the quality and market competitiveness of the product. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a vibrating screening machine for preparing cat litter, which has the characteristics of conveniently vibrating the screen plate and conveniently cleaning the cat litter remaining on the screen plate.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a vibrating screening machine for preparing cat litter, comprising a screening box, a supporting foot being provided at the lower corner of the screening box, a fine screen plate being provided at the lower end of the interior of the screening box, a coarse screen plate being provided at the upper end of the interior of the screening box, a discharge port 1 being provided at the lower end of one side of the screening box, a discharge port 2 being provided at the center position of one side of the screening box, a discharge port 3 being provided at the upper end of the side of the screening box, a screen plate cleaning mechanism being provided at the edge of the other side of the screening box, and a screen plate vibration mechanism being provided at the center position of the other side of the screening box.

[0006] Preferably, the screen plate vibration mechanism includes a reset assembly and a vibration assembly, the vibration assembly is provided at the center position of the other side of the screening box, and the sides of the fine screen plate and the coarse screen plate are both provided with reset assemblies.

[0007] Preferably, the vibration component includes cam 2, rotating shaft 2, synchronous wheel 2, synchronous belt, motor 1, synchronous wheel 1, installation box 1, rotating shaft 1 and cam 1. Installation box 1 is provided at the center position of the other side of the screening box, motor 1 is provided on the side of installation box 1, rotating shaft 1 is provided at the output end of motor 1, the other end of rotating shaft 1 is located below the coarse screen plate and is provided with cam 1, the surface of rotating shaft 1 is located inside the installation box 1 and is provided with synchronous wheel 1, the outer surface of synchronous wheel 1 is meshed with synchronous belt, the inner surface of the other end of synchronous belt is meshed with synchronous wheel 2, rotating shaft 2 is provided on the side of synchronous wheel 2, and the other end of rotating shaft 2 is located below the fine screen plate and is provided with cam 2.

[0008] Preferably, the first rotating shaft and the second rotating shaft are both rotatably connected to the screening box via bearings.

[0009] Preferably, the reset assembly includes a center rod, a spring, a slide groove and a slider. Sliders are provided on the sides of the fine screen plate and the coarse screen plate. The inner wall of the screening box is provided with a slide groove corresponding to the slider. A center rod is provided inside the slider, and a spring is provided on the surface of the center rod at the upper end of the slider.

[0010] Preferably, the screen plate cleaning mechanism includes an oblique protective plate, screw rod 1, screw rod 2, screw rod 3, bristles, a cleaning plate and a transmission assembly. A transmission assembly is provided at the other side edge of the sub-screening box, the upper end of the side of the transmission assembly is located inside the sub-screening box and is provided with screw rod 1, the side center of the transmission assembly is located inside the sub-screening box and is provided with screw rod 2, the lower end of the side of the transmission assembly is located inside the sub-screening box and is provided with screw rod 3, the surfaces of screw rod 1, screw rod 2 and screw rod 3 are all threadedly connected to the cleaning plate, and the lower end of the cleaning plate is provided with bristles.

[0011] Preferably, the screen plate cleaning mechanism further includes an oblique protective plate and a slide rod, a slide rod is provided through the other side of the cleaning plate, and an oblique protective plate is provided obliquely above the cleaning plate and fixed on the inner wall of the screening box.

[0012] Preferably, the transmission assembly includes a rotating rod, bevel gear three, bevel gear one, mounting box two, motor two, bevel gear two, bevel gear four, bevel gear six and bevel gear five. A mounting box two is provided at the other side edge of the screening box, a motor two is provided at the upper end of the mounting box two, a rotating rod is provided at the output end of the motor two, one end of the screw rod one is located inside the mounting box two and is provided with bevel gear two, a bevel gear one meshing with bevel gear two is provided on the surface of the rotating rod, one end of the screw rod two is located inside the mounting box two and is provided with bevel gear four, a bevel gear three meshing with bevel gear four is provided on the surface of the rotating rod, one end of the screw rod three is located inside the mounting box two and is provided with bevel gear six, and a bevel gear five meshing with bevel gear six is provided on the surface of the rotating rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention effectively solves the problem of asynchronous vibration of the sieve plates in the traditional cat litter preparation vibration screening machine by setting a sieve plate vibration mechanism. The vibration assembly uses motor 1 to drive cam 1 and cam 2, and through the transmission of the synchronous belt and the synchronous wheel, ensures that the fine sieve plate and the coarse sieve plate can vibrate synchronously, so that the cat litter is evenly distributed on the sieve plate, improving the screening efficiency and quality, significantly improving the cat litter production efficiency and product quality, and meeting the market demand for high-quality cat litter.

[0015] 2. This invention features a sieve plate cleaning mechanism that automatically removes residual cat litter from the sieve plate. Driven by a screw, the cleaning plate moves along the sieve plate surface, where the bristles sweep away the remaining cat litter and discharge it through the discharge port. An inclined protective plate prevents litter splashing, and a slide bar provides stable guidance for the cleaning plate, reducing manual intervention and labor intensity, improving cleaning efficiency and classification accuracy, and ensuring the purity and quality of the cat litter.

[0016] 3. The present invention is provided with a discharging mechanism to facilitate the cat litter remaining on the screen plate to be pushed out from the discharging port, thereby realizing the classification of cat litter. Discharging port 1, discharging port 2 and discharging port 3 correspond to cat litters of different particle sizes, respectively, ensuring accurate classification of cat litter. The design of the discharging mechanism enables the cat litter after screening to be discharged smoothly, avoiding the residual cat litter affecting the subsequent screening effect, and further improving the production quality and market competitiveness of cat litter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A perspective view of the present invention;

[0018] Figure 2 A three-dimensional diagram from another perspective of the present invention;

[0019] Figure 3 A three-dimensional diagram of the screen plate vibration mechanism of the present invention;

[0020] Figure 4 is a perspective view of the vibration assembly of the present invention;

[0021] Figure 5 is a perspective view of the reset assembly of the present invention;

[0022] Figure 6 A three-dimensional diagram of the screen plate cleaning mechanism of the present invention;

[0023] Figure 7 is a perspective view of the transmission assembly of the present invention;

[0024] Figure: 1, screening box; 2, support leg; 3, discharge port 1; 4, fine screen plate; 5, discharge port 2; 6, discharge port 3; 7, coarse screen plate; 8, screen plate cleaning mechanism; 81, oblique protection plate; 82, screw rod 1; 83, screw rod 2; 84, screw rod 3; 85, brush; 86, cleaning plate; 87, transmission assembly; 871, rotating rod; 872, bevel gear 3; 873, bevel gear 1; 874, mounting box 2; 875, motor 2; 876, bevel gear 2; 87 7. Bevel gear four; 878. Bevel gear six; 879. Bevel gear five; 88. Slide rod; 9. Screen plate vibration mechanism; 91. Reset assembly; 911. Center rod; 912. Spring; 913. Slide groove; 914. Slider; 92. Vibration assembly; 921. Cam two; 922. Rotating shaft two; 923. Synchronous wheel two; 924. Synchronous belt; 925. Motor one; 926. Synchronous wheel one; 927. Mounting box one; 928. Rotating shaft one; 929. Cam one. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0026] Example 1

[0027] See also Figure 1-7 The present invention provides the following technical solutions: a vibrating screening machine for preparing cat litter, comprising a screening box 1, a supporting foot 2 being provided at the lower corner of the screening box 1, a fine screen plate 4 being provided at the lower end of the interior of the screening box 1, a coarse screen plate 7 being provided at the upper end of the interior of the screening box 1, a discharge port 1 3 being provided at the lower end of one side of the screening box 1, a discharge port 2 5 being provided at the center position of one side of the screening box 1, a discharge port 3 being provided at the upper end of the side of the screening box 1, a screen plate cleaning mechanism 8 being provided at the edge of the other side of the screening box 1, and a screen plate vibration mechanism 9 being provided at the center position of the other side of the screening box 1.

[0028] Specifically, the screen plate vibration mechanism 9 includes a reset component 91 and a vibration component 92. The vibration component 92 is provided at the center of the other side of the screening box 1, and the sides of the fine screen plate 4 and the coarse screen plate 7 are both provided with reset components 91.

[0029] By adopting the above technical solution, the screen plate vibration mechanism 9 can make the fine screen plate 4 and the coarse screen plate 7 vibrate synchronously, ensuring that the cat litter is evenly distributed during the screening process, improving the screening efficiency and quality, and effectively solving the problems of uneven screening and low efficiency of traditional screening machines.

[0030] Specifically, the vibration assembly 92 includes a cam 2 921, a rotating shaft 2 922, a synchronous wheel 2 923, a synchronous belt 924, a motor 1 925, a synchronous wheel 1 926, a mounting box 1 927, a rotating shaft 1 928 and a cam 1 929. A mounting box 1 927 is provided at the center position of the other side of the screening box 1. A motor 1 925 is provided on the side of the mounting box 1 927. A rotating shaft 1 928 is provided at the output end of the motor 1 925. The other end of the rotating shaft 1 928 is located below the coarse screen plate 7 and is provided with a cam 1 929. The surface of the rotating shaft 1 928 is located inside the mounting box 1 927 and is provided with a synchronous wheel 1 926. The outer surface of the synchronous wheel 1 926 is meshed with the synchronous belt 924. The inner surface of the other end of the synchronous belt 924 is meshed with the synchronous wheel 2 923. A rotating shaft 2 922 is provided on the side of the synchronous wheel 2 923. The other end of the rotating shaft 2 922 is located below the fine screen plate 4 and is provided with a cam 2 921.

[0031] By adopting the above technical solution, motor 1 925 drives rotating shaft 1 928 and cam 1 929 to rotate, and through the transmission of synchronous belt 924 and synchronous wheel 2 923, rotating shaft 2 922 and cam 2 921 rotate synchronously, thereby realizing synchronous vibration of fine screen plate 4 and coarse screen plate 7, ensuring uniformity and efficiency of cat litter screening.

[0032] Specifically, the first rotating shaft 928 and the second rotating shaft 922 are both rotatably connected to the screening box 1 through bearings.

[0033] By adopting the above technical solution, the stable rotation of the rotating shaft 1 928 and the rotating shaft 2 922 is ensured, friction and wear are reduced, and the service life and operational reliability of the equipment are improved.

[0034] Specifically, the reset assembly 91 includes a center rod 911, a spring 912, a chute 913 and a slider 914. The sliders 914 are provided on the sides of the fine screen plate 4 and the coarse screen plate 7. The inner wall of the sub-screen box 1 is provided with a chute 913 corresponding to the slider 914. The center rod 911 is provided inside the slider 914. The surface of the center rod 911 is located at the upper end of the slider 914 and is sleeved with a spring 912.

[0035] By adopting the above technical solution, the reset component 91 can provide a stable reset force for the screen plate during the vibration process, ensuring that the screen plate can quickly return to its initial position after vibration, further improving the stability of the screening effect.

[0036] When using this embodiment, cat litter is first poured into the screening box 1, and the motor 1 925 is started. The motor 1 925 drives the rotating shaft 1 928 and the cam 1 929 to rotate. Through the transmission of the synchronous belt 924 and the synchronous wheel 2 923, the rotating shaft 2 922 and the cam 2 921 rotate synchronously, thereby driving the fine screen plate 4 and the coarse screen plate 7 to vibrate synchronously. During the vibration process, the cat litter is screened by the fine screen plate 4 and the coarse screen plate 7 and discharged from the discharge port 1 3, the discharge port 2 5 and the discharge port 3 6 respectively, thereby realizing the classification of the cat litter. The spring 912 in the reset component 91 provides a reset force for the screen plate during the vibration process, thereby ensuring the stability and uniformity of the screen plate vibration and improving the screening efficiency and quality.

[0037] Example 2

[0038] The difference between this embodiment and embodiment 1 is that: the screen plate cleaning mechanism 8 includes an oblique protection plate 81, a screw rod 1 82, a screw rod 2 83, a screw rod 3 84, bristles 85, a cleaning plate 86 and a transmission assembly 87. A transmission assembly 87 is provided at the other side edge of the sub-screening box 1. The upper end of the side of the transmission assembly 87 is located inside the sub-screening box 1 and is provided with a screw rod 1 82. The side center of the transmission assembly 87 is located inside the sub-screening box 1 and is provided with a screw rod 2 83. The lower end of the side of the transmission assembly 87 is located inside the sub-screening box 1 and is provided with a screw rod 3 84. The surfaces of the screw rods 1 82, 2 83 and 3 84 are all threadedly connected with a cleaning plate 86. The lower end of the cleaning plate 86 is provided with a brush 85.

[0039] By adopting the above technical solution, the sieve plate cleaning mechanism 8 can automatically clean the residual cat litter on the sieve plate, reduce manual intervention, improve cleaning efficiency and classification accuracy, and ensure the purity and quality of cat litter classification.

[0040] Specifically, the screen plate cleaning mechanism 8 also includes an oblique protection plate 81 and a slide bar 88. The slide bar 88 is provided inside the other side of the cleaning plate 86. An oblique protection plate 81 is provided obliquely above the cleaning plate 86 and fixed on the inner wall of the sub-screen box 1.

[0041] By adopting the above technical solution, the inclined protective plate 81 can prevent cat litter from splashing during the cleaning process, and the slide rod 88 provides a stable sliding guide for the cleaning plate 86, ensuring the smoothness and effectiveness of the cleaning process.

[0042] Specifically, the transmission assembly 87 includes a rotating rod 871, a bevel gear three 872, a bevel gear one 873, a mounting box two 874, a motor two 875, a bevel gear two 876, a bevel gear four 877, a bevel gear six 878 and a bevel gear five 879. The mounting box two 874 is provided at the edge of the other side of the sub-screen box 1. The upper end of the mounting box two 874 is provided with a motor two 875. The output end of the motor two 875 is provided with a rotating rod 871. One end of the screw rod one 82 is located inside the mounting box two 874. There is a bevel gear 876, and the surface of the rotating rod 871 is provided with a bevel gear 873 meshing with the bevel gear 876. One end of the screw rod 83 is located inside the installation box 874 and is provided with a bevel gear 877. The surface of the rotating rod 871 is provided with a bevel gear 872 meshing with the bevel gear 877. One end of the screw rod 84 is located inside the installation box 874 and is provided with a bevel gear 878. The surface of the rotating rod 871 is provided with a bevel gear 879 meshing with the bevel gear 878.

[0043] By adopting the above technical solution, motor 2 875 drives the rotating rod 871 to rotate, and through the meshing transmission of the bevel gears, screw rod 1 82, screw rod 2 83 and screw rod 3 84 rotate synchronously, thereby driving the cleaning plate 86 to move along the surface of the screen plate, realizing automatic cleaning of the screen plate.

[0044] When this embodiment is in use, motor 2 875 is started, and motor 2 875 drives the rotating rod 871 to rotate. Through the meshing transmission of the bevel gears, screw rod 1 82, screw rod 2 83 and screw rod 3 84 rotate synchronously. The cleaning plate 86 moves along the surface of the screen plate driven by the screw rod, and the bristles 85 brush away the residual cat litter on the screen plate. The cleaned cat litter is discharged through the discharge port. The inclined protective plate 81 prevents the cat litter from splashing. The slide rod 88 provides a stable sliding guide for the cleaning plate 86 to ensure the stability and effectiveness of the cleaning process. Through the automatic cleaning function, manual intervention is reduced, the cleaning efficiency and classification accuracy are improved, and the purity and quality of the cat litter classification are ensured.

[0045] The working principle and use process of the present invention: When the present invention is used, cat litter is first poured into the screening box 1, and the motor 1 925 is started. The motor 1 925 drives the rotating shaft 1 928 and the cam 1 929 to rotate. Through the transmission of the synchronous belt 924 and the synchronous wheel 2 923, the rotating shaft 2 922 and the cam 2 921 rotate synchronously, thereby driving the fine screen plate 4 and the coarse screen plate 7 to vibrate synchronously. During the vibration process, the cat litter is screened by the fine screen plate 4 and the coarse screen plate 7 and discharged from the discharge port 1 3, the discharge port 2 5 and the discharge port 3 6 respectively, thereby realizing the classification of the cat litter. The spring 912 in the reset component 91 provides a reset force for the screen plate during the vibration process to ensure the stability of the screen plate vibration. The cleaning plate 86 is driven by the screw rod 82, the brush 85 and the cat litter 86 are moved along the surface of the screen plate, and the brush 85 removes the residual cat litter on the screen plate. The cleaned cat litter is discharged through the discharge port. The inclined protective plate 81 prevents the cat litter from splashing. The slide bar 88 provides a stable sliding guide for the cleaning plate 86 to ensure the stability and effectiveness of the cleaning process. The automatic cleaning function reduces manual intervention, improves cleaning efficiency and classification accuracy, and ensures the purity and quality of cat litter classification.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A vibrating screening machine for preparing cat litter, comprising a screening box (1), wherein a support leg (2) is provided at a corner of the lower end of the screening box (1), a fine screen plate (4) is provided at the lower end of the interior of the screening box (1), a coarse screen plate (7) is provided at the upper end of the interior of the screening box (1), a first discharge port (3) is provided at the lower end of one side of the screening box (1), a second discharge port (5) is provided at the center position of one side of the screening box (1), and a third discharge port (6) is provided at the upper end of the side of the screening box (1), characterized in that: A sieve plate cleaning mechanism (8) is provided at the edge of the other side of the sieve box (1), and a sieve plate vibrating mechanism (9) is provided at the center position of the other side of the sieve box (1).

2. The vibrating screening machine for preparing cat litter according to claim 1, wherein: The screen plate vibration mechanism (9) comprises a reset assembly (91) and a vibration assembly (92). The vibration assembly (92) is provided at the center of the other side of the screening box (1), and the sides of the fine screen plate (4) and the coarse screen plate (7) are both provided with reset assemblies (91).

3. The vibrating screening machine for preparing cat litter according to claim 2, wherein: The vibration assembly (92) includes a cam 2 (921), a rotating shaft 2 (922), a synchronous wheel 2 (923), a synchronous belt (924), a motor 1 (925), a synchronous wheel 1 (926), a mounting box 1 (927), a rotating shaft 1 (928) and a cam 1 (929). A mounting box 1 (927) is provided at the center of the other side of the screening box (1). A motor 1 (925) is provided on the side of the mounting box 1 (927). A rotating shaft 1 (928) is provided at the output end of the motor 1 (925). The rotating shaft 1 (928) The other end of the rotating shaft (928) is located below the coarse screen plate (7) and is provided with a cam (929). The surface of the rotating shaft (928) is located inside the mounting box (927) and is provided with a synchronous wheel (926). The outer surface of the synchronous wheel (926) is meshedly connected with a synchronous belt (924). The inner surface of the other end of the synchronous belt (924) is meshedly connected with a synchronous wheel (923). The side of the synchronous wheel (923) is provided with a rotating shaft (922). The other end of the rotating shaft (922) is located below the fine screen plate (4) and is provided with a cam (921).

4. The vibrating screening machine for preparing cat litter according to claim 3, wherein: The rotating shaft 1 (928) and the rotating shaft 2 (922) are both rotatably connected to the screening box (1) via bearings.

5. The vibrating screening machine for preparing cat litter according to claim 2, wherein: The reset assembly (91) includes a center rod (911), a spring (912), a chute (913) and a slider (914). The sliders (914) are provided on the sides of the fine screen plate (4) and the coarse screen plate (7). The inner wall of the screening box (1) is provided with a chute (913) corresponding to the slider (914). The center rod (911) is provided inside the slider (914). The surface of the center rod (911) is located at the upper end of the slider (914) and is sleeved with a spring (912).

6. The vibrating screening machine for preparing cat litter according to claim 1, characterized in that: The screen plate cleaning mechanism (8) includes an inclined protection plate (81), a screw rod 1 (82), a screw rod 2 (83), a screw rod 3 (84), bristles (85), a cleaning plate (86) and a transmission assembly (87). The transmission assembly (87) is provided at the edge of the other side of the sub-screening box (1). The upper end of the side of the transmission assembly (87) is located inside the sub-screening box (1) and is provided with a screw rod 1 (82). The center of the side of the transmission assembly (87) is located inside the sub-screening box (1) and is provided with a screw rod 2 (83). The lower end of the side of the transmission assembly (87) is located inside the sub-screening box (1) and is provided with a screw rod 3 (84). The surfaces of the screw rod 1 (82), the screw rod 2 (83) and the screw rod 3 (84) are all threadedly connected to the cleaning plate (86). The lower end of the cleaning plate (86) is provided with a brush (85).

7. The vibrating screening machine for preparing cat litter according to claim 6, characterized in that: The screen plate cleaning mechanism (8) further comprises an oblique protective plate (81) and a slide bar (88). The slide bar (88) is provided through the interior of the other side of the cleaning plate (86). An oblique protective plate (81) is provided obliquely above the cleaning plate (86) and is fixed to the inner wall of the screening box (1).

8. The vibrating screening machine for preparing cat litter according to claim 6, characterized in that: The transmission assembly (87) includes a rotating rod (871), a bevel gear three (872), a bevel gear one (873), a mounting box two (874), a motor two (875), a bevel gear two (876), a bevel gear four (877), a bevel gear six (878) and a bevel gear five (879). The mounting box two (874) is provided at the edge of the other side of the screening box (1). The upper end of the mounting box two (874) is provided with a motor two (875). The output end of the motor two (875) is provided with a rotating rod (871). One end of the screw rod one (82) is located inside the mounting box two (874). A bevel gear 2 (876) is provided, a bevel gear 1 (873) meshing with the bevel gear 2 (876) is provided on the surface of the rotating rod (871), one end of the screw rod 2 (83) is located inside the mounting box 2 (874) and is provided with a bevel gear 4 (877), a bevel gear 3 (872) meshing with the bevel gear 4 (877) is provided on the surface of the rotating rod (871), one end of the screw rod 3 (84) is located inside the mounting box 2 (874) and is provided with a bevel gear 6 (878), and a bevel gear 5 (879) meshing with the bevel gear 6 (878) is provided on the surface of the rotating rod (871).

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