A radiation source protection device for the radiology department
The shielding plate and extension plate are adjusted by the motor-driven screw and belt transmission, and the existing devices are solved, and the rapid and effective occlusion of the radiation source protection device is achieved, and the convenience of use and protection effect is improved.
Patent Information
- Application Number
- CN202210843481.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-07-18
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2042-07-18
AI Technical Summary
The existing radiation source protection device needs to be adjusted separately when blocking different trunk parts, which is inconvenient to operate, and the size of the hood plate is fixed, which cannot adapt to the length of the trunk of different patients, resulting in excessive or incomplete partial obstruction, affecting the inspection effect and protective effect.
The adjustment mechanism and extension components are adopted to drive the screw and belt through the motor to realize automatic adjustment of the shield plate and movement of the extension plate, and combine it to adapt to the shading of different trunk parts, improving convenience and protective effect.
The rapid and convenient adjustment of the shielding plate is achieved, the occlusion effect of the patient does not need to be examined, and the practicality and protective effect of the protective device are enhanced.
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Figure CN115898224B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of medical devices, and in particular to a radiation source protection device for a radiology department. Background Art
[0002] X-ray examination is a common medical diagnostic method and is widely used clinically both at home and abroad. When X-rays are irradiated to the human body, cells can be inhibited, damaged, or even necrotic, causing physiological, pathological, and biochemical changes to varying degrees. Therefore, patients and medical staff need to take necessary protective measures during X-ray examinations or radiation-assisted surgeries to avoid excessive X-ray exposure that may affect physiological functions.
[0003] Although currently, protective measures such as wearing lead protective clothing, neck scarves, or fixed protective curtains are commonly used in medical procedures, wearable protective measures are cumbersome and easy to slip off, affecting the inspection of staff and reducing work efficiency. In addition, multiple people wearing the same protective gear can easily cause cross-infection. Moreover, during some X-ray examinations in hospitals, usually only certain parts of the body need to be examined, but when the patient stands in front of the X-ray machine, other parts that do not need to be examined and treated are usually exposed to radiation during the entire examination process. Sometimes the parts are large or small, so it will cause unnecessary damage to the human body, which is not practical. According to a radiation source protection device for radiology departments disclosed in Chinese patent CN202020933684.1, the patent is equipped with a radiation shielding device. When a certain part needs to be inspected, it is only necessary to open the shielding plate at the corresponding position and close the shielding plates at other parts to shield the parts that do not need to be irradiated, thereby avoiding damage to the human body and improving the practicality of the radiation source protection device; by providing a lifting component, when a person stands on it, the height of the lifting plate is adjusted according to the height, so that the human body just adapts to the position of the shielding plate, so that the radiation source protection device has the characteristics of adapting to people of different heights.
[0004] However, the shielding plate of this patent needs to be individually controlled and adjusted for each part when shielding different parts of the torso, which is inconvenient to operate, and the size of the shielding plate is relatively fixed. Since the lengths of the torsos of different patients may be different, some parts that need to be inspected may be blocked too much, affecting the inspection effect, while some parts that do not need to be inspected are not completely blocked, which will still cause harm to the human body, greatly reducing the protective effect and use effect of the protective device. Therefore, a radiation source protection device for the radiology department is proposed. Summary of the Invention
[0005] In view of the deficiencies in the prior art, the present invention provides a radiation source protection device for the radiology department, which has the advantages of being easy to adjust the protection device, thereby effectively improving the protection effect on the human body, etc., and solves the problem that the shielding plates of the existing radiation source protection devices for the radiology department need to be individually controlled and adjusted for each part when shielding different torso parts, which is inconvenient to operate, and the size of the shielding plates is relatively fixed. Since the lengths of the torsos of different patients may be different, some parts that need to be inspected may be blocked too much, affecting the inspection effect, while some parts that do not need to be inspected may not be completely blocked, which may still cause damage to the human body, greatly reducing the protection effect and use effect of the protection device.
[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a radiation source protection device for a radiology department, comprising a fixed plate, a main body fixedly mounted on the top of the fixed plate, a sandwich layer formed inside the main body, a fixed frame fixedly mounted on the top of the main body, two shielding plates movably mounted inside the sandwich layer, an adjustment mechanism provided on both the fixed plate and the fixed frame, an extension assembly provided inside the shielding plate, and a driving member provided on the adjustment mechanism;
[0007] The adjusting mechanism includes a first motor fixedly mounted on the bottom of the fixing frame, a first screw is rotatably connected to the top of the fixing plate and the left and right sides of the main body, the top of the first screw on the left is fixedly connected to the output end of the first motor, and the top of the first screw on the right is rotatably connected to the bottom of the fixing frame, the outer portions of the two first screws are simultaneously threadedly sleeved with a sleeve plate, the outer portions of the two shielding plates are simultaneously slidably connected to the inner wall of the sleeve plate, the outer portions of the two first screws are fixedly mounted with a belt pulley, and the outer portions of the two belt pulleys are simultaneously transmission-connected with a belt;
[0008] The tops of the two shielding plates are each provided with an end that passes through and extends to a cavity below the shielding plates, and a storage groove is provided on the side of the inner wall of the cavity away from each other. The extension component includes a second motor, and the second motor is fixedly mounted on the inner top wall of the left storage groove. A second screw is fixedly mounted on the output end of the second motor, and a limiting rod is fixedly mounted on the inner top wall and the inner bottom wall of the storage groove on the right side at the same time. The outside of the second screw and the limiting rod is provided with a connecting block with one end extending to the inside of the cavity, and an extension plate is fixedly mounted on the relatively close side of the two connecting blocks, a docking groove is provided on the left side of the extension plate on the right side, and a docking plate with one end extending to the inside of the docking groove is fixedly mounted on the right side of the extension plate on the left side.
[0009] Furthermore, the driving component includes two dual-axis motors, and the two dual-axis motors are respectively fixedly installed on the opposite sides of the two sleeve plates. The output ends of the dual-axis motors are fixedly installed with rotating rods, and the outside of the rotating rods is fixedly installed with gears. The outsides of the two shielding plates are each provided with two racks, and the adjacent gears and racks on the left and right are meshed.
[0010] Furthermore, movable holes communicating with the interlayer are provided on both the left and right sides of the main body, and the movable holes are adapted to the sleeve plate and the rack.
[0011] Furthermore, a first threaded through hole adapted to the first screw rod is provided inside the sleeve plate, and the sleeve plate is sleeved on the outside of the main body in an arc shape.
[0012] Furthermore, a slide groove is provided on the inner side of the sleeve plate, and two T-shaped sliders are slidably connected inside the slide groove, and the opposite sides of the two T-shaped sliders are fixedly connected to the left and right sides of the inner wall of the sleeve plate, and the slide groove and the T-shaped sliders are adapted to each other.
[0013] Furthermore, the connecting block on the left is threadedly sleeved with the external thread of the second screw rod, a second threaded through hole adapted to the second screw rod is provided inside the connecting block on the left, and the connecting block on the right is slidably sleeved with the external portion of the limiting rod.
[0014] Furthermore, a docking hole adapted to the extension plate is provided on one side opposite to the two shielding plates, and the cavity is adapted to the extension plate.
[0015] Furthermore, an entrance is provided on the front of the main body, and movable holes adapted to the shielding plate are provided on two opposite side surfaces on the left and right of the entrance, and the movable holes are communicated with the interlayer.
[0016] Furthermore, the gear is located on the front side of the first screw, and the outer wall of the shielding plate is in contact with the inner wall of the interlayer.
[0017] Furthermore, the two first screws pass through the bearing and the top of the fixing plate and the bottom of the fixing frame respectively, and the belt is sleeved on the outside of the fixing frame.
[0018] Compared with the existing technology, the technical solution of this application has the following beneficial effects:
[0019] When the radiation source protection device for the radiology department is used, the patient enters the main body from the entrance, and then the position of the shielding plate is adjusted according to the patient's torso part that does not need to be examined. By starting the first motor, the first screw on the left side rotates forward or reversely to drive the left belt pulley to rotate, and the belt rotation drives the right belt pulley to rotate, so that the first screw on the right side rotates, so that the cover plate drives the two shielding plates to move up and down to a certain height. The cover plate movement drives the two dual-axis motors to move to a certain height. At the same time, the two dual-axis motors are started to rotate the rotating rod and the gear, thereby driving the rack to move and drive the two shielding plates to move relatively close to each other. , insert the docking plate into the docking groove, and then start the second motor to rotate the second screw forward or reverse, so that the left connecting block moves up or down a certain distance to drive the left extension plate to move. Since the two extension plates are limited by the docking plate and the docking groove, the movement of the left extension plate can drive the right extension plate to move together. At this time, the area formed by the combination of the two extension plates and the two shielding plates can just complete the shielding of the patient's torso parts that do not need to be examined. In this way, the device can be quickly adjusted in a targeted manner, thereby improving the convenience of using the device and effectively improving the use effect and protection effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the structure of the present invention;
[0021] Figure 2 This is a partial top cross-sectional view of a radiation source protection device for use in a radiology department according to the present invention;
[0022] Figure 3 The present invention is a radiation source protection device for radiology department Figure 1 Enlarged view of point A in the middle;
[0023] Figure 4 The present invention is a radiation source protection device for radiology department Figure 1 Enlarged view of point B in the middle;
[0024] Figure 5 The present invention is a radiation source protection device for radiology department Figure 2 Enlarged view of point C in the middle;
[0025] Figure 6 The present invention is a radiation source protection device for radiology department Figure 2 Enlarged view of point D in the middle;
[0026] Figure 7 The present invention is a radiation source protection device for radiology department Figure 2 Enlarged view of point E in the middle;.
[0027] In the figure: 1 fixed plate, 2 main body, 21 entrance, 3 interlayer, 4 fixed frame, 5 shielding plate, 6 adjustment mechanism, 61 first motor, 62 first screw, 63 sleeve, 631 slide, 632 T-type slider, 64 belt pulley, 65 belt, 7 extension component, 71 cavity, 72 storage slot, 73 second motor, 74 second screw, 75 limit rod, 76 connecting block, 77 extension plate, 78 docking groove, 79 docking plate, 8 driving member, 81 dual-axis motor, 82 rotating rod, 83 gear, 84 rack. DETAILED DESCRIPTION
[0028] 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.
[0029] See also Figure 1-7 In this embodiment, a radiation source protection device for a radiology department includes a fixed plate 1, a main body 2 is fixedly installed on the top of the fixed plate 1, a mezzanine 3 is opened inside the main body 2, a fixed frame 4 is fixedly installed on the top of the main body 2, two shielding plates 5 are movably installed inside the mezzanine 3, the outer wall of the shielding plate 5 is in contact with the inner wall of the mezzanine 3, and an adjustment mechanism 6 is provided on the fixed plate 1 and the fixed frame 4. The adjustment mechanism 6 includes a first motor 61 fixedly installed on the bottom of the fixed frame 4, and the top of the fixed plate 1 and the left and right sides of the main body 2 are rotatably connected to the first screw 62. The top of the left first screw 62 is fixedly connected to the output end of the first motor 61, and the top of the right first screw 62 is rotatably connected to the bottom of the fixed frame 4. The outer parts of the two first screws 62 are simultaneously threadedly sleeved with a sleeve plate 63, and the outer parts of the two shielding plates 5 are simultaneously slidably connected to the inner wall of the sleeve plate 63. The outer parts of the two first screws 62 are fixedly installed with a belt pulley 64, and the outer parts of the two belt pulleys 64 are simultaneously connected with a belt 65 for transmission.
[0030] An entrance 21 is provided on the front of the main body 2 , and movable holes adapted to the shielding plate 5 are provided on the left and right opposite side surfaces of the entrance 21 , and the movable holes are communicated with the interlayer 3 , so as to facilitate the movement of the shielding plate 5 .
[0031] Among them, a first threaded through hole adapted to the first screw 62 is opened inside the sleeve 63, so that the first screw 62 can rotate to drive the sleeve 63 to adjust and move. The sleeve 63 is arranged in an arc shape on the outside of the main body 2, so that the sleeve 63 can be moved and adjusted outside the main body 2.
[0032] Specifically, when in use, the patient enters the main body 2 from the entrance 21, and then adjusts the position of the shielding plate 5 according to the patient's torso part that does not need to be examined. By starting the first motor 61, the left first screw 62 rotates forward or reverse to drive the left belt pulley 64 to rotate, and the belt 65 rotates to drive the right belt pulley 64 to rotate and the right first screw 62 to rotate, so that the sleeve 63 drives the two shielding plates 5 to move up and down to a certain height, so that the shielding plates 5 can be targeted to block the parts of the patient that do not need to be examined.
[0033] In addition, the two first screw rods 62 pass through the bearings and the top of the fixing plate 1 and the bottom of the fixing frame 4 respectively, and the belt 65 is sleeved on the outside of the fixing frame 4.
[0034] In this embodiment, an extension component 7 is provided inside the shielding plate 5. The tops of the two shielding plates 5 are each provided with a cavity 71 with one end passing through and extending to the bottom of the shielding plate 5. A storage groove 72 is provided on the side of the inner wall of the cavity 71 away from each other. The extension component 7 includes a second motor 73. The second motor 73 is fixedly mounted on the inner top wall of the left storage groove 72. A second screw 74 is fixedly mounted on the output end of the second motor 73. A limiting rod 75 is fixedly mounted on the inner top wall and the inner bottom wall of the right storage groove 72 at the same time. The outside of the second screw 74 and the limiting rod 75 are both provided with a connecting block 76 with one end extending to the inside of the cavity 71. An extension plate 77 is fixedly mounted on the relatively close side of the two connecting blocks 76. A docking groove 78 is provided on the left side of the right extension plate 77. A docking plate 79 with one end extending to the inside of the docking groove 78 is fixedly mounted on the right side of the left extension plate 77. A driving member 8 is provided on the adjustment mechanism 6.
[0035] Among them, the left connecting block 76 is threadedly sleeved with the external thread of the second screw 74, and a second threaded through hole adapted to the second screw 74 is opened inside the left connecting block 76, so that the second screw 74 can rotate to drive the connecting block 76 to adjust and move on the left side. The right connecting block 76 is slidably sleeved with the outside of the limit rod 75, and when the right extension plate 77 moves, it drives the right connecting block 76 to slide on the outside of the limit rod 75, thereby improving the stability of the movement of the right extension plate 77.
[0036] Specifically, by starting the driving member 8, the two shielding plates 5 are driven to move relatively close to each other, so that the docking plate 79 is inserted into the docking groove 78, and then the second motor 73 is started to rotate the second screw 74 forward or reverse, so that the left connecting block 76 moves up or down a certain distance to drive the left extension plate 77 to move. Since the two extension plates 77 are connected and limited by the docking plate 79 and the docking groove 78, the movement of the left extension plate 77 can drive the right extension plate 77 to move together. At this time, the area formed by the combination of the two extension plates 77 and the two shielding plates 5 can just complete the shielding of the patient's torso parts that do not need to be examined, effectively improving the protection effect of the device.
[0037] In this embodiment, the driving member 8 includes two dual-axis motors 81, and the two dual-axis motors 81 are respectively fixedly installed on the opposite sides of the two sleeve plates 63. The output ends of the dual-axis motors 81 are fixedly installed with rotating rods 82, and the outside of the rotating rod 82 is fixedly installed with gears 83. The gear 83 is located on the front side of the first screw 62. The outer sides of the two baffles 5 are provided with two racks 84, and the adjacent gears 83 and racks 84 on the left and right are meshed.
[0038] Specifically, by simultaneously starting the two dual-axis motors 81 to rotate the rotating rod 82 and drive the gear 83 to rotate, thereby driving the rack 84 to move and drive the two shielding plates 5 to be relatively close to each other, thereby achieving the purpose of shielding and protection.
[0039] In this embodiment, movable holes connected to the interlayer 3 are provided on both the left and right sides of the main body 2, and the movable holes are adapted to the sleeve plate 63 and the rack 84. By providing the movable holes, the sleeve plate 63 and the rack 84 can be easily moved and adjusted.
[0040] In this embodiment, a sliding groove 631 is opened on the inner side of the sleeve plate 63, and two T-shaped sliders 632 are slidably connected inside the sliding groove 631, and the opposite sides of the two T-shaped sliders 632 are fixedly connected to the left and right sides of the inner wall of the sleeve plate 63, and the sliding groove 631 and the T-shaped sliders 632 are adapted to each other.
[0041] Specifically, when the gear 83 drives the rack 84 to move, the shielding plate 5 moves and adjusts, and the T-shaped slider 632 slides inside the slide groove 631, thereby limiting the movement range of the shielding plate 5 and improving the stability of the movement of the shielding plate 5.
[0042] In this embodiment, docking holes adapted to the extension plate 77 are provided on opposite sides of the two shielding plates 5 , and the cavity 71 is adapted to the extension plate 77 , so that the two extension plates 77 can fit together.
[0043] It should be noted that the electrical components appearing in this article are all electrically connected to the controller and the power supply. The control method of the present invention is controlled by the controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.
[0044] The working principle of the above embodiment is:
[0045] When the radiation source protection device for radiology department of the present invention is used, the patient enters the main body 2 from the entrance 21, and then the position of the shielding plate 5 is adjusted according to the patient's torso part that does not need to be examined. By starting the first motor 61, the left first screw 62 rotates forward or reverse to drive the left belt pulley 64 to rotate, and the belt 65 rotates to drive the right belt pulley 64 to rotate to rotate the right first screw 62, so that the cover plate 63 drives the two shielding plates 5 to move up and down to a certain height, and the cover plate 63 moves to drive the two dual-axis motors 81 to move to a certain height, and at the same time, the two dual-axis motors 81 are started to rotate the rotating rod 82 to drive the gear 83 to rotate, so that The driving rack 84 moves and drives the two shielding plates 5 to be relatively close and fit together, so that the docking plate 79 is inserted into the docking groove 78, and then the second motor 73 is started to rotate the second screw 74 forward or reverse, so that the left connecting block 76 moves up or down a certain distance to drive the left extension plate 77 to move. Since the two extension plates 77 are connected and limited by the docking plate 79 and the docking groove 78, the movement of the left extension plate 77 can drive the right extension plate 77 to move together. At this time, the area formed by the two extension plates 77 and the two shielding plates 5 can just complete the shielding of the patient's torso parts that do not need to be examined, so that radiological examination can be performed on the parts that need to be examined.
[0046] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.
[0047] 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 radiation source protection device for a radiology department, comprising a fixing plate (1), characterized in that: A main body (2) is fixedly mounted on the top of the fixed plate (1), an interlayer (3) is provided inside the main body (2), a fixing frame (4) is fixedly mounted on the top of the main body (2), two shielding plates (5) are movably mounted inside the interlayer (3), an adjustment mechanism (6) is provided on both the fixed plate (1) and the fixing frame (4), an extension assembly (7) is provided inside the shielding plate (5), and a driving member (8) is provided on the adjustment mechanism (6); The adjusting mechanism (6) comprises a first motor (61) fixedly mounted on the bottom of the fixing frame (4); the top of the fixing plate (1) and the left and right sides of the main body (2) are both rotatably connected with first screw rods (62); the top of the first screw rod (62) on the left side is fixedly connected to the output end of the first motor (61); the top of the first screw rod (62) on the right side is rotatably connected to the bottom of the fixing frame (4); the outer portions of the two first screw rods (62) are simultaneously threadedly sleeved with a sleeve plate (63); the outer portions of the two shielding plates (5) are simultaneously slidably connected to the inner wall of the sleeve plate (63); the outer portions of the two first screw rods (62) are both fixedly mounted with a belt pulley (64); and the outer portions of the two belt pulleys (64) are simultaneously transmission-connected with a belt (65); The tops of the two shielding plates (5) are each provided with a cavity (71) with one end penetrating and extending to the bottom of the shielding plates (5), and a storage groove (72) is provided on the inner wall of the cavity (71) away from each other. The extension component (7) includes a second motor (73), and the second motor (73) is fixedly mounted on the inner top wall of the left storage groove (72). The output end of the second motor (73) is fixedly mounted with a second screw (74). The inner top wall and inner top wall of the right storage groove (72) are fixedly mounted. The bottom wall is also fixedly mounted with a limiting rod (75), and the outside of the second screw rod (74) and the limiting rod (75) are both provided with a connecting block (76) with one end extending into the interior of the cavity (71), and an extension plate (77) is fixedly mounted on the relatively close side of the two connecting blocks (76), a docking groove (78) is provided on the left side of the right extension plate (77), and a docking plate (79) with one end extending into the interior of the docking groove (78) is fixedly mounted on the right side of the left extension plate (77).
2. A radiation source protection device for radiology department according to claim 1, characterized in that: The driving member (8) comprises two dual-axis motors (81), the two dual-axis motors (81) being fixedly mounted on opposite sides of the two sleeve plates (63), the output ends of the dual-axis motors (81) being fixedly mounted with rotating rods (82), the exterior of the rotating rods (82) being fixedly mounted with gears (83), the exteriors of the two shielding plates (5) being provided with two racks (84), the gears (83) and racks (84) being adjacent on the left and right being meshed with each other.
3. The radiation source protection device for radiology department according to claim 2, characterized in that: Both the left and right sides of the main body (2) are provided with movable holes connected to the interlayer (3), and the movable holes are adapted to the sleeve plate (63) and the rack (84).
4. The radiation source protection device for radiology department according to claim 1, characterized in that: A first threaded through hole adapted to the first screw rod (62) is provided inside the sleeve plate (63), and the sleeve plate (63) is sleeved on the outside of the main body (2) in an arc shape.
5. The radiation source protection device for radiology department according to claim 1, characterized in that: A sliding groove (631) is provided on the inner side of the sleeve plate (63), and two T-shaped sliders (632) are slidably connected inside the sliding groove (631), and the opposite sides of the two T-shaped sliders (632) are fixedly connected to the left and right sides of the inner wall of the sleeve plate (63), and the sliding groove (631) and the T-shaped sliders (632) are adapted to each other.
6. The radiation source protection device for radiology department according to claim 1, characterized in that: The connecting block (76) on the left side is threadedly sleeved with the external thread of the second screw rod (74), and a second threaded through hole adapted to the second screw rod (74) is provided inside the connecting block (76) on the left side. The connecting block (76) on the right side is slidably sleeved with the external part of the limiting rod (75).
7. The radiation source protection device for radiology department according to claim 1, characterized in that: A docking hole adapted to the extension plate (77) is provided on one side opposite to the two shielding plates (5), and the cavity (71) is adapted to the extension plate (77).
8. The radiation source protection device for radiology department according to claim 1, characterized in that: An entrance (21) is provided on the front of the main body (2), and movable holes adapted to the shielding plate (5) are provided on two opposite side surfaces of the entrance (21), and the movable holes are communicated with the interlayer (3).
9. The radiation source protection device for radiology department according to claim 2, characterized in that: The gear (83) is located on the front side of the first screw (62), and the outer wall of the shielding plate (5) is in contact with the inner wall of the interlayer (3).
10. The radiation source protection device for radiology department according to claim 1, characterized in that: The two first screw rods (62) pass through the bearings and the top of the fixed plate (1) and the bottom of the fixed frame (4), respectively, and the belt (65) is sleeved on the outside of the fixed frame (4).
Citation Information
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