Device for preventing deep vein thrombosis of lower limbs

Abstract

The application relates to a device for preventing deep vein thrombosis of lower limbs, wherein the device comprises a rectangular base provided with a mounting bin at one end, the upper surface of the base is provided with a horizontal sliding groove, a knee bending mechanism, a sliding rod, a lower leg placing plate, a thigh placing plate, a sliding rod slidingly installed in the horizontal sliding groove, the lower leg placing plate is rotationally installed on the sliding rod and rotationally connected with the thigh placing plate, the thigh placing plate is rotationally installed on the rectangular base, a bent leg mechanism, a rotating plate, a plurality of connecting rods, the rotating plate is rotationally installed on the sliding rod, the rotating plate is rotationally connected with the plurality of connecting rods, the plurality of connecting rods are rotationally connected with the mounting bin, and a push-pull mechanism for driving the sliding rod to reciprocatingly slide in the horizontal sliding groove. The knee joint of a patient is bent through the knee bending mechanism, and the ankle and lower leg of the patient are bent through the bent leg mechanism, the problem that the prior art cannot simultaneously massage multiple parts such as the knee joint, the lower leg and the ankle is solved, and the possibility of deep vein thrombosis of lower limbs of the patient is reduced.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a device for preventing deep vein thrombosis in the lower extremities. Background Technology

[0002] Deep vein thrombosis (DVT) of the lower extremities is a disease in which blood abnormally coagulates in the deep veins of the lower extremities, forming a thrombus that blocks the blood vessels. The main causes of DVT include slow venous blood flow, especially in patients with limited mobility who are bedridden for long periods of time, which makes them more susceptible to slow venous blood return and thrombus formation. Therefore, nurses need to regularly massage the legs of patients.

[0003] Nurses primarily rely on manual labor when massaging patients' legs, such as repeatedly raising and lowering the knee joint, massaging the calf muscles, and moving the ankle. However, because massage is physically demanding and requires a lot of effort, some hospitals have introduced simple massage devices to assist with leg massage. However, these devices are limited by their limited range of motion and cannot simultaneously massage multiple areas such as the knee joint, calf, and ankle, resulting in less than ideal massage effects. Currently, no effective solution has been proposed to address the problem of existing technology's inability to simultaneously massage multiple areas such as the knee joint, calf, and ankle. Utility Model Content

[0004] This invention provides a device to prevent deep vein thrombosis in the lower extremities, which solves the problem that existing technologies cannot simultaneously massage multiple parts such as the knee joint, calf, and ankle.

[0005] This utility model provides a nursing bed that can be turned over twice, comprising:

[0006] A rectangular base with an installation compartment fixed at one end has a horizontal groove on its upper surface;

[0007] A knee flexion mechanism includes a thigh placement plate, a calf placement plate, and a slide rod. The slide rod is slidably installed in a horizontal slide groove and the sliding direction is perpendicular to its own axis. The first end of the calf placement plate is rotatably installed on the slide rod, and the second end is rotatably connected to the first end of the thigh placement plate through a first rotating shaft. The second end of the thigh placement plate is rotatably installed on the upper surface of a rectangular base through a second rotating shaft. The first rotating shaft, the second rotating shaft, and the slide rod are parallel to each other.

[0008] The bending foot mechanism includes a rotating plate and multiple connecting rods. The rotating plate is rotatably mounted on the slide rod. One side of the rotating plate near the lower leg placement plate is connected to a fixing component for fixing the foot, and the other side is rotatably connected to the first end of the multiple connecting rods through a third rotating shaft. The second end of the multiple connecting rods is rotatably connected to the mounting chamber through a fourth rotating shaft. The connecting rods are perpendicular to the slide rod, and the third and fourth rotating shafts are parallel to the slide rod.

[0009] A push-pull mechanism is used to drive the slide bar to slide back and forth in a horizontal groove.

[0010] In some embodiments, the rectangular base has an internal mounting cavity, and the bottom wall of the horizontal slide groove has multiple horizontal sliding openings that communicate with the mounting cavity, with the horizontal sliding openings perpendicular to the slide rod.

[0011] The push-pull mechanism includes multiple fixed sleeves, multiple reciprocating lead screws, and a drive component. The multiple fixed sleeves are slidably installed in multiple horizontal sliding ports. The multiple reciprocating lead screws are rotatably installed inside the mounting cavity with one end extending into the mounting chamber. The reciprocating lead screws are parallel to the horizontal sliding ports. The first end of each of the multiple fixed sleeves is connected to a slide rod, and the second end is threaded onto the multiple reciprocating lead screws. The drive component is installed in the mounting chamber and is used to drive the reciprocating lead screws to rotate.

[0012] In some of these embodiments, the thread length on the reciprocating lead screw is equal to the length of the horizontal slide.

[0013] In some embodiments, the upper surface of the calf rest plate is provided with a plurality of evenly distributed massage columns, which are parallel to the slide bar.

[0014] In some embodiments, leg guards are fixedly installed on both sides of the calf resting plate, and the leg guards are higher than the massage column.

[0015] In some embodiments, the distance between the first and second pivots is equal to the distance between the slide rod and the first pivot, and when the fixed sleeve slides to one end of the horizontal slide near the thigh placement plate, the horizontal distance between the slide rod and the second pivot is √3 times the distance between the first and second pivots.

[0016] In some of these embodiments, the second shaft is mounted on the upper surface of the rectangular base via ball bearings.

[0017] In some of the embodiments, the rectangular base has a slanted groove at one end near the thigh placement plate, and the angle of the slanted groove is 15 degrees.

[0018] In some embodiments, the fixing component includes a fixing strap, both ends of which are fixedly connected to the rotating plate and a channel for the foot to extend into is formed between the fixing strap and the rotating plate. The fixing strap is made of rubber.

[0019] In some embodiments, the drive component includes multiple drive motors, all of which are located inside the mounting chamber and their output ends pass through the mounting cavity and are fixedly connected to one end of multiple reciprocating lead screws via couplings.

[0020] Compared with related technologies, the present invention has the following beneficial effects:

[0021] 1. By using a push-pull mechanism to drive the slide bar to reciprocate along the horizontal slide groove, the angle between the lower leg placement plate and the thigh placement plate in the knee flexion mechanism and the height of the first rotating shaft relative to the rectangular base are changed. This allows the patient's leg to repeatedly perform knee flexion and leg expansion, thereby activating the knee joint. At the same time, the direction of the tilt of the rotating plate relative to the rectangular base in the foot bending mechanism is changed, allowing the patient's ankle to repeatedly perform bending and expansion. This also allows the calf muscles to be stretched and relaxed, thereby activating the lower leg and ankle. This solves the problem that existing technologies cannot simultaneously massage multiple parts such as the knee joint, lower leg, and ankle, reducing the possibility of deep vein thrombosis in the lower extremities.

[0022] 2. By setting massage columns on the upper surface of the calf resting plate to increase the massage effect on the calf muscles, setting leg baffles on both sides to prevent the legs from swinging around, and setting slanted grooves on the rectangular base to improve the fit between the legs and the device, the user's comfort is increased.

[0023] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the device for preventing deep vein thrombosis in the lower extremities in this embodiment;

[0025] Figure 2 This is a front sectional view of the device for preventing deep vein thrombosis in the lower extremities in this embodiment;

[0026] Figure 3 This is a partial three-dimensional structural diagram of the rotating plate and fixing sleeve in this embodiment;

[0027] Figure 4 This is a side sectional view of the device for preventing deep vein thrombosis in the lower extremities in this embodiment.

[0028] In the diagram: 1. Rectangular base; 2. Thigh placement plate; 3. Lower leg placement plate; 4. Horizontal slide groove; 5. Slide rod; 6. Rotating plate; 7. Mounting cavity; 8. Fixing sleeve; 9. Reciprocating lead screw; 10. Horizontal slide opening; 11. Mounting chamber; 12. Connecting rod; 13. Fixing strap; 14. Leg baffle; 15. Massage column; 16. Inclined groove. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Reference Figure 1 As shown, this embodiment provides a device for preventing deep vein thrombosis in the lower extremities, which includes a rectangular base 1, a knee bending mechanism, a foot bending mechanism, and a push-pull mechanism.

[0032] An installation chamber 11 is fixedly provided at one end of the rectangular base 1, and a horizontal sliding groove 4 is provided on the upper surface of the rectangular base 1.

[0033] The knee flexion mechanism includes a thigh placement plate 2, a calf placement plate 3, and a slide rod 5. The slide rod 5 is slidably installed in a horizontal groove 4 with its sliding direction perpendicular to its own axis. The first end of the calf placement plate 3 is rotatably mounted on the slide rod 5, and the second end is rotatably connected to the first end of the thigh placement plate 2 via a first pivot. The second end of the thigh placement plate 2 is rotatably mounted on the upper surface of the rectangular base 1 via a second pivot. The first pivot and the second pivot are parallel to the slide rod 5. When the slide rod 5 slides towards the end of the horizontal groove 4 near the calf placement plate 3, the calf placement plate 3 rotates around the slide rod 5. Then, the calf placement plate 3 drives the thigh placement plate 2 to rotate via the first pivot, and the angle between the calf placement plate 3 and the thigh placement plate 2 gradually decreases, while the height of the first pivot relative to the rectangular base 1 gradually increases. When the slide rod 5 slides towards the other end of the horizontal groove 4, the angle between the calf placement plate 3 and the thigh placement plate 2 gradually increases, while the height of the first pivot relative to the rectangular base 1 gradually decreases.

[0034] Furthermore, refer to Figure 1 and Figure 3As shown, in this embodiment, the upper surface of the calf support plate 3 is provided with multiple evenly distributed massage columns 15, which are parallel to the slide rod 5. The massage columns 15 are designed in a semi-cylindrical shape. When the calf support plate 3 rotates, the massage columns 15 apply a certain pressure to the calf muscle, thereby providing a massage effect on the gastrocnemius muscle of the calf. To improve the fit between the leg and the knee flexion mechanism, for example, in this embodiment, leg baffles 14 are fixedly installed on both sides of the calf support plate 3, and the leg baffles 14 are higher than the massage columns 15. Since the calf support plate 3 cannot directly fix the calf, leg baffles 14 higher than the massage columns 15 are designed on both sides to prevent the leg from swinging and to improve leg comfort.

[0035] For example, the second rotating shaft is mounted on the upper surface of the rectangular base 1 via a ball bearing. The outer ring of the ball bearing is fixedly connected to the rectangular base 1, and the inner ring is coaxially connected to the second rotating shaft. The ball bearing transforms the sliding friction between the inner and outer rings into rolling friction, reducing friction and making the thigh placement plate 2 rotate more smoothly. To improve the fit between the leg and the device, in this embodiment, the rectangular base 1 has a slanted groove 16 at one end near the thigh placement plate 2, with an angle of 15 degrees. The slanted groove 16 facilitates placement of the thigh root, and the angle of the slanted groove 16 is less than or equal to the minimum angle between the thigh placement plate 2 and the horizontal plane, thereby ensuring a good fit between the thigh and the device.

[0036] The bending foot mechanism includes a rotating plate 6 and multiple connecting rods 12. The rotating plate 6 is rotatably mounted on the slide rod 5. One side of the rotating plate 6 near the lower leg placement plate 3 is connected to a fixing component for fixing the foot, and the other side is rotatably connected to the first end of the multiple connecting rods 12 via a third rotating shaft. The second end of the multiple connecting rods 12 is rotatably connected to the mounting chamber 11 via a fourth rotating shaft. The connecting rods 12 are perpendicular to the slide rod 5, and the third and fourth rotating shafts are parallel to the slide rod 5.

[0037] The lower end of the rotating plate 6 is rotatably mounted on the slide rod 5, and the upper end is equipped with a third rotating shaft. When the slide rod 5 is located at the center point of the horizontal slide groove 4, the rotating plate 6 is exactly perpendicular to the slide rod 5. When the slide rod 5 slides towards the end of the horizontal slide groove 4 near the lower leg placement plate 3, the lower end of the rotating plate 6 moves horizontally, while the upper end remains stationary in the horizontal direction. This causes the two ends of the connecting rod 12 to rotate around the third and fourth rotating shafts, respectively. At the same time, the rotating plate 6 rotates around the slide rod 5, and finally causes the rotating plate 6 to tilt relative to the rectangular base 1 towards the lower leg placement plate 3. When the slide rod 5 slides towards the other end of the horizontal slide groove 4, the rotating plate 6 will rotate in the opposite direction around the slide rod 5, and finally also causes the rotating plate 6 to tilt relative to the rectangular base 1 to the other side.

[0038] Furthermore, refer to Figure 1As shown, in this embodiment, the fixing component includes a fixing strap 13. Both ends of the fixing strap 13 are fixedly connected to the rotating plate 6, and a channel for the foot to be inserted is formed between the fixing strap 13 and the rotating plate 6. The fixing strap 13 is made of rubber. The rubber fixing strap 13 has a certain elasticity. Then, the patient's foot is inserted into the channel, and the patient's foot can be simply fixed by the restriction of the channel.

[0039] The push-pull mechanism is used to drive the slide bar 5 to slide back and forth in the horizontal slide groove 4.

[0040] Furthermore, in this embodiment, referring to Figure 2 and Figure 4 As shown, the rectangular base 1 has an installation cavity 7 inside. The bottom wall of the horizontal slide groove 4 has multiple horizontal sliding openings 10 that communicate with the installation cavity 7. The horizontal sliding openings 10 are perpendicular to the slide rod 5. The push-pull mechanism includes multiple fixed sleeves 8, multiple reciprocating screws 9, and a drive component. The multiple fixed sleeves 8 are slidably installed in the multiple horizontal sliding openings 10. The multiple reciprocating screws 9 are rotatably installed inside the installation cavity 7 and one end extends into the installation chamber 11. The reciprocating screws 9 are parallel to the horizontal sliding openings 10. The first end of the multiple fixed sleeves 8 is connected to the slide rod 5, and the second end is threaded onto the multiple reciprocating screws 9. The drive component is installed in the installation chamber 11 and is used to drive the reciprocating screws 9 to rotate.

[0041] The drive component is installed inside the mounting chamber 11, and the reciprocating lead screw is installed inside the mounting cavity 7. When the drive component drives the reciprocating lead screw 9 to rotate, the fixed sleeve 8, threaded onto the reciprocating lead screw 9, slides back and forth along the horizontal slide opening 10, thereby causing the slide rod 5 to slide back and forth along the horizontal slide groove 4. Furthermore, to prevent excessive sliding of the fixed sleeve 8 relative to the reciprocating lead screw, which could lead to stripping, the thread length on the reciprocating lead screw 9 is equal to the length of the horizontal slide opening 10. Because the length of the horizontal slide opening 10 is less than the length of the reciprocating lead screw 9, the length of the thread on the reciprocating lead screw 9 is designed to limit the reciprocating sliding distance of the fixed sleeve 8. For example, the drive component includes multiple drive motors, all located inside the mounting chamber 11, with their output ends passing through the mounting cavity 7 and fixedly connected to one end of each of the multiple reciprocating lead screws 9 via couplings. The mounting chamber 11 contains multiple drive motors, each used to drive the multiple reciprocating lead screws 9 to rotate.

[0042] Furthermore, refer to Figure 2As shown, in this embodiment, the distance between the first and second rotating shafts is equal to the distance between the slide rod 5 and the first rotating shaft. When the fixing sleeve 8 slides to the horizontal sliding opening 10 near one end of the thigh placement plate 2, the horizontal distance between the slide rod 5 and the second rotating shaft is √3 times the distance between the first and second rotating shafts. That is, the length of the thigh placement plate 2 is equal to the length of the calf placement plate 3, and the minimum included angle between the thigh placement plate 2 and the calf placement plate 3 can be deduced from the relationship of the lengths of the three sides of the triangle, which is approximately 120 degrees, to prevent the patient's knee joint from being raised too high and causing discomfort.

[0043] Reference Figure 2 As shown, during use, the patient's leg is first placed into the device to prevent deep vein thrombosis in the lower extremities. The patient's foot is fixed by a fixing component. Then, the sliding rod 5 is driven by a push-pull mechanism to slide back and forth in the horizontal groove 4. In the knee flexion mechanism, when the sliding rod 5 slides towards the end of the horizontal groove 4 near the lower leg placement plate 3, the lower leg placement plate 3 will rotate around the sliding rod 5. Then, the lower leg placement plate 3 will drive the thigh placement plate 2 to rotate through the first rotating shaft. The angle between the lower leg placement plate 3 and the thigh placement plate 2 will gradually decrease, and the height of the first rotating shaft relative to the rectangular base 1 will gradually increase, thereby raising the patient's leg and completing the knee flexion action. When the sliding rod 5 slides towards the other end of the horizontal groove 4, the angle between the lower leg placement plate 3 and the thigh placement plate 2 will gradually increase, and the height of the first rotating shaft relative to the rectangular base 1 will gradually decrease, thereby lowering and extending the patient's leg to move the knee joint. In the bending leg mechanism, when the slide rod 5 is located at the center point of the horizontal slide groove 4, the rotating plate 6 is exactly perpendicular to the slide rod 5. When the slide rod 5 slides towards the end of the horizontal slide groove 4 near the lower leg placement plate 3, the lower end of the rotating plate 6 moves horizontally while the upper end remains stationary in the horizontal direction. This causes the two ends of the connecting rod 12 to rotate around the third and fourth rotation axes respectively, while the rotating plate 6 rotates around the slide rod 5. Finally, the rotating plate 6 tilts relative to the rectangular base 1 towards the lower leg placement plate 3, causing the patient's ankle to bend inward and also providing a certain stretching effect to the calf muscles. When the slide rod 5 slides towards the other end of the horizontal slide groove 4, the rotating plate 6 will rotate in the opposite direction around the slide rod 5, and finally, the rotating plate 6 will also tilt relative to the rectangular base 1 to the other side, causing the patient's ankle to extend outward and also relaxing the calf muscles, thereby activating the lower leg and ankle.

[0044] In summary, this embodiment uses a push-pull mechanism to drive the slide bar 5 to reciprocate along the horizontal slide groove 4, changing the angle between the lower leg placement plate 3 and the thigh placement plate 2 in the knee flexion mechanism, as well as the height of the first rotating shaft relative to the rectangular base 1. This causes the patient's leg to repeatedly rise and fall, correspondingly completing knee flexion and leg expansion, thereby activating the knee joint. Simultaneously, it changes the direction of the tilt of the rotating plate 6 relative to the rectangular base 1 in the foot bending mechanism, causing the patient's ankle to repeatedly bend inward and extend outward, which also stretches and relaxes the calf muscles, thereby activating the lower leg and ankle. This solves the problem that existing technologies cannot simultaneously massage multiple parts such as the knee joint, lower leg, and ankle, reducing the possibility of deep vein thrombosis in the lower extremities.

[0045] Furthermore, in this embodiment, massage columns are provided on the upper surface of the calf placement plate 3 to increase the massage effect on the calf muscles, leg baffles 14 are provided on both sides to prevent the legs from swaying, and inclined grooves 16 are provided on the rectangular base 1 to improve the fit between the legs and the device, thereby increasing the user's comfort.

[0046] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0047] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

Claims

1. A device for preventing deep vein thrombosis in the lower extremities, characterized in that, include: A rectangular base (1) with an installation compartment (11) fixed at one end has a horizontal groove (4) on its upper surface; The knee flexion mechanism includes a thigh placement plate (2), a calf placement plate (3) and a slide rod (5). The slide rod (5) is slidably installed in a horizontal slide groove (4) and the sliding direction is perpendicular to its own axis. The first end of the calf placement plate (3) is rotatably installed on the slide rod (5) and the second end is rotatably connected to the first end of the thigh placement plate (2) through a first rotating shaft. The second end of the thigh placement plate (2) is rotatably installed on the upper surface of a rectangular base (1) through a second rotating shaft. The first rotating shaft and the second rotating shaft are parallel to the slide rod (5). The bending foot mechanism includes a rotating plate (6) and multiple connecting rods (12). The rotating plate (6) is rotatably mounted on the slide rod (5). The rotating plate (6) has a fixing component for fixing the foot connected to one side near the lower leg placement plate (3), and the other side is rotatably connected to the first end of multiple connecting rods (12) through a third rotating shaft. The second end of multiple connecting rods (12) is rotatably connected to the mounting chamber (11) through a fourth rotating shaft. The connecting rods (12) are perpendicular to the slide rod (5), and the third and fourth rotating shafts are parallel to the slide rod (5). A push-pull mechanism is used to drive the slide bar (5) to slide back and forth in the horizontal slide groove (4).

2. The device for preventing deep vein thrombosis of the lower extremities according to claim 1, characterized in that, The rectangular base (1) has an installation cavity (7) inside. The bottom wall of the horizontal slide groove (4) has multiple horizontal slide openings (10) that communicate with the installation cavity (7). The horizontal slide openings (10) are perpendicular to the slide rod (5). The push-pull mechanism includes multiple fixed sleeves (8), multiple reciprocating screws (9) and a drive component. The multiple fixed sleeves (8) are slidably installed in the multiple horizontal slide openings (10). The multiple reciprocating screws (9) are rotatably installed inside the installation cavity (7) and one end extends into the installation chamber (11). The reciprocating screws (9) are parallel to the horizontal slide openings (10). The first end of the multiple fixed sleeves (8) is connected to the slide rod (5) and the second end is threaded onto the multiple reciprocating screws (9). The drive component is installed in the installation chamber (11) and is used to drive the reciprocating screws (9) to rotate.

3. The device for preventing deep vein thrombosis of the lower extremities according to claim 2, characterized in that, The thread length on the reciprocating lead screw (9) is equal to the length of the horizontal slide (10).

4. The device for preventing deep vein thrombosis of the lower extremities according to claim 1, characterized in that, The upper surface of the calf support plate (3) is provided with multiple evenly distributed massage columns (15), which are parallel to the slide bar (5).

5. The device for preventing deep vein thrombosis of the lower extremities according to claim 4, characterized in that, Leg baffles (14) are fixedly installed on both sides of the calf placement plate (3), and the leg baffles (14) are higher than the massage column (15).

6. The device for preventing deep vein thrombosis of the lower extremities according to claim 2, characterized in that, The distance between the first and second rotating shafts is equal to the distance between the slide rod (5) and the first rotating shaft. When the fixed sleeve (8) slides to the horizontal sliding opening (10) near one end of the thigh placement plate (2), the horizontal distance between the slide rod (5) and the second rotating shaft is √3 times the distance between the first and second rotating shafts.

7. The device for preventing deep vein thrombosis of the lower extremities according to claim 1, characterized in that, The second shaft is mounted on the upper surface of the rectangular base (1) via ball bearings.

8. The device for preventing deep vein thrombosis of the lower extremities according to claim 1, characterized in that, The rectangular base (1) has a slanted groove (16) at one end near the thigh placement plate (2), and the angle of the slanted groove (16) is 15 degrees.

9. The device for preventing deep vein thrombosis of the lower extremities according to claim 1, characterized in that, The fixing component includes a fixing strap (13), both ends of which are fixedly connected to the rotating plate (6) and a channel for the foot to be inserted is formed between the fixing strap (13) and the rotating plate (6). The fixing strap (13) is made of rubber.

10. The device for preventing deep vein thrombosis of the lower extremities according to claim 2, characterized in that, The drive component includes multiple drive motors, all of which are located inside the mounting chamber (11) and their output ends pass through the mounting cavity (7) and are respectively fixedly connected to one end of multiple reciprocating lead screws (9) via couplings.

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