A high-contrast, low-dose phase-contrast CT imaging device

Abstract

The present invention relates to the field of CT imaging equipment, in particular to a high-contrast low-dose phase contrast CT imaging equipment, comprising a supporting base, a supporting frame is fixedly installed on the upper front end of the supporting base, a moving bed is movably installed on the upper side of the supporting frame, a restraining piece is arranged on the moving bed, a fan is fixedly installed on the lower front end of the supporting frame, a first air supply pipe is fixedly installed on the front side of the fan, a second air cylinder is fixedly installed inside the front side of the moving bed, sliding grooves are respectively arranged on the front and rear sides of the supporting frame, rotating gears are rotatably installed on the front and rear ends of the sliding groove in the supporting frame, a wind wheel is fixedly axially connected to the rotating gear, and the wind wheel and the rotating gear can rotate concentrically, and a chain is cooperatively installed between two rotating gears on the same side, the lower end of a moving rod is fixedly installed on a chain close to it, and a cleaning frame can be closely fitted with the upper side of the moving bed, which can not only prevent pets from gnawing on the equipment, but also clean the equipment after use.

Description

Technical Field

[0001] The invention relates to the field of CT imaging equipment, in particular to a high-contrast and low-dose phase-contrast CT imaging equipment. Background Art

[0002] CT is computer tomography, which uses precisely collimated X-ray beams, gamma rays, ultrasound, etc., together with highly sensitive detectors to perform cross-sectional scans one after another around a certain part of the human body. It has the characteristics of fast scanning time and clear images, and can be used to examine a variety of diseases. CT has been widely used in various examinations, and the application objects have spread to various types. When performing CT scans on pets, for pets with hair, there is a situation of hair loss, so that hair remains on the equipment, affecting the cleanliness of the equipment. Moreover, for some pets that secrete mucus, some mucus is difficult to handle, and manual processing is cumbersome. In addition, when the equipment is at its peak working period, there will be problems of untimely manual processing and high manpower consumption. Therefore, based on the above problems, the device is innovatively designed. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a high-contrast, low-dose phase-contrast CT imaging device.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a high-contrast low-dose phase contrast CT imaging device, comprising a supporting base, a supporting frame is fixedly installed on the upper end of the front side of the supporting base, a mobile bed is movably installed on the upper side of the supporting frame, a restraining member is arranged on the mobile bed, a fan is fixedly installed on the lower side of the front end of the supporting frame, a first air supply pipe is fixedly installed on the front side of the fan, a second air cylinder is fixedly installed inside the front side of the mobile bed, and the other end of the first air supply pipe is connected to the second air cylinder through the other end, the second air cylinder is connected to the fourth air supply pipe through the other end, and the fourth air supply pipe is connected to the front side of the first air cylinder through the other end, and the corresponding position on the other side of the first air cylinder is connected through the The third air supply pipe, a sealing box is fixedly arranged on the left side of the support frame, the other end of the third air supply pipe is connected to the sealing box, a wind wheel is rotatably installed inside the sealing box, sliding grooves are respectively arranged on the front and rear sides of the support frame, and rotating gears are rotatably installed on the front and rear ends of the sliding grooves in the support frame, the wind wheel is fixedly axially connected to the rotating gear, and the wind wheel and the rotating gear can rotate cocentrically, and a chain is cooperatedly installed between the two rotating gears on the same side, and moving rods are movably installed inside the corresponding sliding grooves on the front and rear sides, the lower end of the moving rod is fixedly installed on a chain close to it, and a cleaning frame is fixedly installed on the upper end of the moving rod, and the cleaning frame can fit tightly with the upper side of the moving bed.

[0005] Specifically, the cleaning rack includes an air blowing port, a disinfection brush, a cleaning brush and a device plate. The device plate is fixedly installed on the upper end of the moving rod. The cleaning brush is rotatably installed on the rear side of the device plate, and the disinfection brush is fixedly installed on the upper side of the device plate behind the cleaning brush. The air blowing port is fixedly installed on the device plate behind the disinfection brush.

[0006] Specifically, a second sealing plate is movably installed inside the second gas cylinder, a movable frame is fixedly installed on the upper end of the second sealing plate, and the movable frame is movably installed on the second gas cylinder, and the fourth gas delivery pipe is connected to the upper side of the second gas cylinder.

[0007] Specifically, both sides of the upper end of the moving frame are rotatably connected to the rotating rods, the rotating rods are rotatably installed inside the moving bed, and the other ends of the rotating rods are rotatably connected to the closing plates.

[0008] Specifically, a first sealing plate is movably installed inside the first air cylinder, and the first air cylinder is fixedly installed inside the support frame on the lower side of the moving bed. A gas rod is fixedly installed on the rear end of the first sealing plate, and the gas rod is movably installed on the first air cylinder, and the other end of the gas rod is fixedly connected to the moving bed.

[0009] Specifically, the fourth gas pipe includes a first shunt pipe and a second shunt pipe, the other end of the fourth gas pipe is shunt-connected to the first shunt pipe and the second shunt pipe, and the other ends of the first shunt pipe and the second shunt pipe are respectively connected to the front sides of the two first gas cylinders.

[0010] Specifically, a control valve is fixedly installed on the outer side of the third gas pipeline, and the first gas pipeline includes an outlet pipe, which is installed on the first gas pipeline.

[0011] Specifically, the upper side of the sealing box is connected to the second air pipe, and the other end of the second air pipe is fixedly mounted on the cleaning frame, and the second air pipe is connected to the air outlet.

[0012] Specifically, a moving groove is provided at the upper front end of the moving bed, and closing plates are movably installed on the left and right sides of the moving bed respectively, and the closing plates are movably installed at the left and right ends inside the moving groove.

[0013] Beneficial effects of the present invention:

[0014] The high-contrast, low-dose phase-contrast CT imaging device described in the present invention cooperates with the use of a second gas cylinder, a second sealing plate, a movable frame and a rotating rod. The gas in the second gas cylinder drives the movable frame to move upward through the second sealing plate, and the movable frame drives the closing plate to move in the movable groove through the rotating rod, thereby achieving position fixing of the pet's head, preventing the pet from being frightened and uneasy due to seeing during the CT process, and preventing the pet from biting the equipment with its mouth to damage it.

[0015] The high-contrast, low-dose phase-contrast CT imaging device described in the present invention cooperates with a first gas cylinder, a third gas pipe, a wind wheel, a rotating gear and a moving rod. The gas gathered in the first gas cylinder flows into a sealed box through the third gas pipe, so that the wind wheel drives the rotating gear to rotate, and the rotating gear drives the moving rod to translate in a sliding groove through a chain, so that the cleaning frame cleans the upper side of the moving bed, thereby removing hair and mucus left on the surface of the moving bed by pets. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 For the present invention Figure 1 Schematic diagram of the cross-sectional structure of the middle AA part;

[0019] Figure 3 For the present invention Figure 1 Schematic diagram of the cross-sectional structure of the middle BB part;

[0020] Figure 4 For the present invention Figure 1 The structural diagram of the sealing box;

[0021] Figure 5 For the present invention Figure 1 A schematic diagram of the structure of the first gas cylinder and the gas rod;

[0022] Figure 6 For the present invention Figure 1 The structural diagram of the middle cleaning rack;

[0023] In the figure: 1. supporting base; 2. moving bed; 3. restraining member; 4. moving groove; 5. closing plate; 6. supporting frame; 7. sliding groove; 8. first air cylinder; 9. air rod; 10. fan; 11. first air supply pipe; 111. air outlet pipe; 12. first sealing plate; 13. cleaning frame; 131. blowing port; 132. disinfection brush; 133. cleaning brush; 14. second air supply pipe; 15. third air supply pipe; 151. control valve; 16. moving rod; 17. second air cylinder; 18. second sealing plate; 19. moving frame; 20. rotating rod; 21. fourth air supply pipe; 211. first shunt pipe; 212. second shunt pipe; 22. sealing box; 23. wind wheel; 24. rotating gear; 25. chain. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0025] like Figure 1-Figure 6 As shown, a high-contrast low-dose phase contrast CT imaging device according to the present invention comprises a supporting base 1, a supporting frame 6 is fixedly installed on the upper end of the front side of the supporting base 1, a moving bed 2 is movably installed on the upper side of the supporting frame 6, a restraining member 3 is arranged on the moving bed 2, a fan 10 is fixedly installed on the lower side of the front end of the supporting frame 6, a first air supply pipe 11 is fixedly installed on the front side of the fan 10, a second air cylinder 17 is fixedly installed inside the front side of the moving bed 2, and the other end of the first air supply pipe 11 is connected to the second air cylinder 17, and the other side of the second air cylinder 17 is connected to the fourth air supply pipe 17. The air pipe 21 is provided, and the other end of the fourth air pipe 21 is connected to the front side of the first air cylinder 8, and the corresponding position on the other side of the first air cylinder 8 is connected to the third air pipe 15, a sealing box 22 is fixedly arranged on the left side of the support frame 6, and the other end of the third air pipe 15 is connected to the sealing box 22, and a wind wheel 23 is rotatably installed inside the sealing box 22, and sliding grooves 7 are respectively provided on the front and rear sides of the support frame 6, and rotating gears 24 are rotatably installed on the front and rear ends of the sliding groove 7 in the support frame 6, respectively, and the wind wheel 23 is fixedly connected to the rotating gear 24, and the wind wheel 23 and the rotating gear 24 can rotate concentrically, and a chain 25 is installed between the two rotating gears 24 on the same side, and a moving rod 16 is installed in the corresponding sliding grooves 7 on the front and rear sides respectively, and the lower end of the moving rod 16 is fixedly installed on the chain 25 close to it, and the upper end of the moving rod 16 is fixedly installed with a cleaning frame 13, and the cleaning frame 13 can be tightly fitted with the upper side of the moving bed 2. When the scanning is completed, the control valve on the third air supply pipe 15 is opened, and the gas gathered in the first air cylinder 8 flows into the sealing box 22 through the third air supply pipe 15, and the airflow drives the rotating installation The wind wheel 23 in the sealing box 22 rotates, and the rotation of the wind wheel 23 drives the rotating gear 24 connected to the fixed shaft to rotate. The rotation of the rotating gear 24 drives the chain 25 meshing with it to rotate and move in the sliding groove 7 of the support frame 6, so that the chain 25 drives the moving rod 16 fixedly connected to it to translate from front to back in the sliding groove 7, and the moving rod 16 drives the cleaning frame 13 fixedly installed therewith to translate, so that the cleaning frame 13 cleans the upper side of the moving bed 2, thereby removing the hair and mucus left on the surface of the moving bed 2 by the pet.

[0026] Specifically, the cleaning rack 13 includes an air blowing port 131, a disinfection brush 132, a cleaning brush 133 and a device plate 134. The device plate 134 is fixedly installed on the upper end of the moving rod 16. The cleaning brush 133 is rotatably installed on the rear side of the device plate 134, and the disinfection brush 132 is fixedly installed on the upper side of the device plate 134 on the rear side of the cleaning brush 133. The air blowing port 131 is fixedly installed on the device plate 134 on the rear side of the disinfection brush 132. During the moving cleaning process of the cleaning rack 13, the cleaning brush 133 first pre-cleans the surface of the moving bed 2, and the disinfection brush 132 then disinfects and cleans the pre-cleaned surface of the moving bed 2, thereby achieving disinfection and cleaning of the upper surface of the moving bed 2.

[0027] Specifically, a second sealing plate 18 is movably installed inside the second gas cylinder 17, a movable frame 19 is fixedly installed on the upper end of the second sealing plate 18, and the movable frame 19 is movably installed on the second gas cylinder 17, and the fourth gas supply pipe 21 is connected to the upper side of the second gas cylinder 17, so that the second sealing plate 18 drives the movable frame 19 to move up and down in the second gas cylinder 17.

[0028] Specifically, both sides of the upper end of the mobile frame 19 are rotatably connected to the rotating rods 20, the rotating rods 20 are rotatably installed inside the mobile bed 2, and the other ends of the rotating rods 20 are rotatably connected to the closing plates 5, so that the mobile frame 19 drives the closing plates 5 to move left and right through the rotating rods 20, thereby achieving the limit fixation and relaxation of the pet's head.

[0029] Specifically, a first sealing plate 12 is movably installed inside the first air cylinder 8, and the first air cylinder 8 is fixedly installed inside the support frame 6 on the lower side of the moving bed 2. A gas rod 9 is fixedly installed on the rear end of the first sealing plate 12, and the gas rod 9 is movably installed on the first air cylinder 8. The other end of the gas rod 9 is fixedly connected to the moving bed 2, so that the first air cylinder 8 drives the moving bed 2 to move, extend, and reset and recover inside the support frame 6 through the gas rod 9.

[0030] Specifically, the fourth gas pipe 21 includes a first branch pipe 211 and a second branch pipe 212, and the other end of the fourth gas pipe 21 is connected to the first branch pipe 211 and the second branch pipe 212, and the other ends of the first branch pipe 211 and the second branch pipe 212 are respectively connected to the front sides of the two first gas cylinders 8.

[0031] Specifically, a control valve 151 is fixedly installed on the outside of the third gas pipe 15, and the first gas pipe 11 includes an outlet pipe 111, which is installed on the first gas pipe 11. The gas in the fourth gas pipe 21 is diverted through the first diverter pipe 211 and the second diverter pipe 212 that are connected thereto, so that the gas in the fourth gas pipe 21 flows into the first gas cylinder 8 that is connected thereto through the first diverter pipe 211 and the second diverter pipe 212 respectively through the first diverter pipe 211 and the second diverter pipe 212, so that the gas gathers inside the first gas cylinder 8.

[0032] Specifically, the upper side of the sealing box 22 is connected to the second air pipe 14, and the other end of the second air pipe 14 is fixedly mounted on the cleaning frame 13, and the second air pipe 14 is connected to the air port 131, and then the gas in the sealing box 22 flows through the second air pipe 14 to the air port 131 to blow dry the upper surface of the moving bed 2 after cleaning.

[0033] Specifically, a moving groove 4 is provided at the upper front end of the moving bed 2, and closing plates 5 are movably installed on the left and right sides of the moving bed 2 respectively, and the closing plates 5 are movably installed at the left and right ends inside the moving groove 4, and the movement of the closing plates 5 is limited and guided by the moving groove 4.

[0034] Working principle: The pet is fixed on the upper side of the mobile bed 2 by the restraining part 3 to prevent the pet from moving, and the fan 10 is started. The fan 10 inflates the second air cylinder 17 through the first air supply pipe 11. As the gas gathers in the second air cylinder 17, the gas gathered in the second air cylinder 17 drives the second sealing plate 18 to move upward in the second air cylinder 17. The second sealing plate 18 drives the mobile frame 19 fixedly connected thereto to move upward on the second air cylinder 17. The upward movement of the mobile frame 19 drives the rotating rod 20 rotatably connected to its two ends to rotate inwardly. The rotation of the rotating rod 20 drives the closing plate 5 rotatably connected thereto to move inwardly in the moving groove 4, and then the closing plates 5 on both sides move to the side close to the pet, thereby realizing the limit fixation of the pet's head, preventing the pet from being frightened and uneasy due to seeing during the CT process, and preventing the pet from biting the equipment with its mouth to damage it.

[0035] When the second sealing plate 18 moves upward inside the second gas cylinder 17 to the through connection between the fourth gas pipe 21 and the second gas cylinder 17, the gathered gas is diverted from the second gas cylinder 17 to the fourth gas pipe 21, so that the second sealing plate 18 stops moving and remains at the through connection between the fourth gas pipe 21 and the second gas cylinder 17, that is, the closing plate 5 remains in a closed state, so as to achieve continuous isolation and fixation of the pet's head, and the gas in the fourth gas pipe 21 is diverted through the first diverter pipe 211 and the second diverter pipe 212 which are through-connected therewith, so that the gas in the fourth gas pipe 21 passes through the first diverter pipe 211 and the second diverter pipe 212. The flow tube 211 and the second branch tube 212 flow into the first gas cylinder 8 which is connected to the first branch tube 211 and the second branch tube 212 respectively, so that the gas gathers inside the first gas cylinder 8, and the gathered gas drives the first sealing plate 12 which is sealed inside the first gas cylinder 8 to move backward, thereby making the gas rod 9 which is fixedly connected to the first sealing plate 12 move and extend in the first gas cylinder 8, and the moving bed 2 which is fixedly installed with the gas rod 9 is moved backward in the support frame 6 through the gas rod 9, so as to facilitate the moving bed 2 to move into the scanning area of ​​the equipment, and then the fan 10 is turned off to stop the gas supply.

[0036] When the scan is completed, the control valve on the third air supply pipe 15 is opened, and the gas gathered in the first air cylinder 8 flows into the sealing box 22 through the third air supply pipe 15. The airflow drives the wind wheel 23 rotatably installed in the sealing box 22 to rotate. The rotation of the wind wheel 23 drives the rotating gear 24 fixedly connected to it to rotate. The rotation of the rotating gear 24 drives the chain 25 meshingly installed therewith to rotate and move in the sliding groove 7 of the support frame 6, thereby causing the chain 25 to drive the moving rod 16 fixedly connected thereto to translate from front to back in the sliding groove 7. The moving rod 16 drives the cleaning frame 13 fixedly installed therewith to translate, thereby causing the cleaning frame 13 to clean the upper side of the moving bed 2, thereby removing the hair and mucus left on the surface of the moving bed 2 by the pet.

[0037] Among them, during the moving cleaning process of the cleaning rack 13, the cleaning brush 133 first pre-cleans the surface of the moving bed 2, and the disinfection brush 132 then disinfects and cleans the pre-cleaned surface of the moving bed 2. Thereafter, the gas in the sealing box 22 flows to the air port 131 through the second air supply pipe 14, and the upper surface of the moving bed 2 after cleaning is blown dry to achieve disinfection and cleaning of the upper surface of the moving bed 2.

[0038] At the same time, when the control valve on the third gas supply pipe 15 is opened, the accumulated gas is lost, causing the first sealing plate 12 sealed inside the first gas cylinder 8 to move forward, thereby causing the gas rod 9 fixedly connected to the first sealing plate 12 to move and retract in the first gas cylinder 8. The moving bed 2 fixedly installed with the gas rod 9 is moved forward in the support frame 6 through the gas rod 9, thereby facilitating the moving bed 2 to move out of the scanning area of ​​the equipment and realizing the resetting of the moving bed 2 on the support frame 6.

[0039] At the same time, when the gas accumulated in the first air cylinder 8 is lost, the gas accumulated in the second air cylinder 17 also begins to be lost, but when the second sealing plate 18 moves to the lower side of the through-connection between the fourth air supply pipe 21 and the second air cylinder 17, the second sealing plate 18 stops moving. At this time, there is still a lot of gas left in the interior of the first air cylinder 8. Thereafter, the air outlet pipe 111 on the first air supply pipe 11 is opened, so that the gas in the second air cylinder 17 flows out through the air outlet pipe 111 of the first air supply pipe 11, thereby causing the second sealing plate 18 to move downward in the second air cylinder 17, and the second sealing plate 18 drives the movable frame 19 fixedly connected thereto to move downward on the second air cylinder 17. The movable frame 19 moves downward and drives the rotating rod 20 rotatably connected to its two ends to rotate outward. The rotating rod 20 rotates and drives the closing plate 5 rotatably connected thereto to move outward in the moving groove 4 to open, thereby causing the closing plates 5 on both sides to move to the side away from the pet, thereby releasing the limit fixation on the pet's head.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-contrast, low-dose phase-contrast CT imaging device, comprising a support base (1), characterized in that: A support frame (6) is fixedly mounted on the upper front end of the support base (1), a movable bed (2) is movably mounted on the upper side of the support frame (6), a restraining member (3) is provided on the movable bed (2), a fan (10) is fixedly mounted on the lower front end of the support frame (6), a first air supply pipe (11) is fixedly mounted on the front side of the fan (10), a second air cylinder (17) is fixedly mounted inside the front side of the movable bed (2), the other end of the first air supply pipe (11) is connected to the second air cylinder (17), and the other side of the second air cylinder (17) is connected to a fourth air supply pipe (11). The support frame (6) is provided with a fourth gas supply pipe (21), and the other end of the fourth gas supply pipe (21) is connected to the front side of the first gas cylinder (8), and the corresponding position of the other side of the first gas cylinder (8) is connected to the third gas supply pipe (15). A sealing box (22) is fixedly arranged on the left side of the support frame (6), and the other end of the third gas supply pipe (15) is connected to the sealing box (22). A wind wheel (23) is rotatably installed inside the sealing box (22). The support frame (6) is provided with sliding grooves (7) on the front and rear sides respectively, and the front and rear ends of the sliding groove (7) in the support frame (6) are rotatably installed. The wind wheel (23) and the rotating gear (24) are fixedly connected to each other, and the wind wheel (23) and the rotating gear (24) can rotate coaxially, and a chain (25) is installed between the two rotating gears (24) on the same side, and a moving rod (16) is movably installed inside the corresponding sliding grooves (7) on the front and rear sides, and the lower end of the moving rod (16) is fixedly installed on the chain (25) adjacent thereto, and the upper end of the moving rod (16) is fixedly installed with a cleaning frame (13), and the cleaning frame (13) can be connected to the moving bed (2 ) is tightly fitted on the upper side; a second sealing plate (18) is movably installed inside the second gas cylinder (17), a movable frame (19) is fixedly installed on the upper end of the second sealing plate (18), and the movable frame (19) is movably installed on the second gas cylinder (17), and a fourth gas supply pipe (21) is connected to the upper side of the second gas cylinder (17); both sides of the upper end of the movable frame (19) are rotatably connected to the rotating rod (20), the rotating rod (20) is rotatably installed inside the movable bed (2), and the other end of the rotating rod (20) is rotatably connected to the closing plate (5).

2. A high-contrast, low-dose phase contrast CT imaging device according to claim 1, characterized in that: The cleaning rack (13) comprises an air blowing port (131), a disinfecting brush (132), a cleaning brush (133) and a device plate (134); the device plate (134) is fixedly mounted on the upper end of the moving rod (16); the cleaning brush (133) is rotatably mounted on the rear side of the device plate (134); the disinfecting brush (132) is fixedly mounted on the upper side of the device plate (134) on the rear side of the cleaning brush (133); and the air blowing port (131) is fixedly mounted on the device plate (134) on the rear side of the disinfecting brush (132).

3. The high-contrast, low-dose phase contrast CT imaging device according to claim 1, characterized in that: A first sealing plate (12) is movably mounted inside the first gas cylinder (8), and the first gas cylinder (8) is fixedly mounted inside a support frame (6) at the lower side of the movable bed (2); a gas rod (9) is fixedly mounted on the rear side end of the first sealing plate (12), and the gas rod (9) is movably mounted on the first gas cylinder (8), and the other end of the gas rod (9) is fixedly connected to the movable bed (2).

4. A high-contrast, low-dose phase contrast CT imaging device according to claim 3, characterized in that: The fourth gas delivery pipe (21) comprises a first shunt pipe (211) and a second shunt pipe (212); the other end of the fourth gas delivery pipe (21) is connected to the first shunt pipe (211) and the second shunt pipe (212); the other ends of the first shunt pipe (211) and the second shunt pipe (212) are connected to the front sides of the two first gas cylinders (8) respectively.

5. The high-contrast, low-dose phase contrast CT imaging device according to claim 4, characterized in that: A control valve (151) is fixedly mounted on the outside of the third gas pipeline (15), and the first gas pipeline (11) comprises an outlet pipe (111), which is installed through the first gas pipeline (11).

6. A high-contrast, low-dose phase contrast CT imaging device according to claim 5, characterized in that: The upper side of the sealing box (22) is connected to the second air supply pipe (14), and the other end of the second air supply pipe (14) is fixedly mounted on the cleaning frame (13), and the second air supply pipe (14) is connected to the air blowing port (131).

7. A high-contrast, low-dose phase contrast CT imaging device according to claim 6, characterized in that: A moving groove (4) is provided at the upper front end of the moving bed (2), and closing plates (5) are movably mounted on the left and right sides of the moving bed (2), respectively, and the closing plates (5) are movably mounted at the left and right ends inside the moving groove (4).

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