Magnetic resonance radio frequency coil scanning auxiliary device

Abstract

The invention belongs to the technical field of magnetic resonance, and discloses a magnetic resonance radio frequency coil scanning auxiliary device which comprises a moving mechanism, and the moving mechanism comprises a motor, a gear, a rack, a fixing hole, a moving bed, a fixing seat, a first cavity, a push plate, a fixing block and a first spring. Through cooperation of structures such as the rack and the moving bed, a patient can be conveniently and safely transferred, when the patient is in a coma or severely injured state and cannot move, the motor is started to enable the rack to drive the moving bed on the sickbed main body where the patient lies to move to the scanning bed through transmission, and the scanning bed can scan the patient. A patient which cannot move can be stably transferred from a sickbed to a scanning bed, secondary injury possibly caused by manual carrying is avoided, manpower is saved, the patient can receive scanning examinations such as magnetic resonance more conveniently, and a doctor can timely and accurately obtain illness state information of the patient.

Description

Technical Field

[0001] The present invention belongs to the field of magnetic resonance technology, and in particular is a magnetic resonance radio frequency coil scanning auxiliary device. Background Art

[0002] In the field of modern medical imaging diagnosis, magnetic resonance imaging (MRI) technology has become an indispensable and important means of clinical diagnosis due to its excellent soft tissue resolution and lack of radiation hazards. It plays a key role in disease diagnosis, treatment plan formulation, and efficacy evaluation. As one of the core components of the MRI system, the performance of the magnetic resonance radiofrequency coil directly affects the imaging quality and diagnostic accuracy. However, in actual clinical operations, there are many challenges. For example, patients may be unable to adjust their body position to cooperate with the placement of the radiofrequency coil due to injury, illness, or poor physical condition.

[0003] Existing magnetic resonance radio frequency coil scanning devices mostly rely on manual transfer of patients who are unconscious or seriously injured and unable to move from the hospital bed to the scanning bed. This not only requires a lot of manpower, but is also very likely to cause secondary injuries to the patient during the transfer process due to improper force, coordination errors, etc. At the same time, manual transfer of patients is not only cumbersome but also slow. The entire transfer process takes a long time and may cause delays in the patient's scanning examination, affecting the doctor's timely acquisition of medical information and delaying the diagnosis and treatment. Therefore, a magnetic resonance radio frequency coil scanning auxiliary device is proposed. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a magnetic resonance radio frequency coil scanning auxiliary device.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a magnetic resonance radio frequency coil scanning auxiliary device, comprising a coil scanner, and further comprising:

[0006] A moving mechanism, wherein the moving mechanism is located on a side of the coil scanner;

[0007] The movable mechanism includes a motor, a gear, a rack, a fixing hole, a movable bed, a fixed seat, a first cavity, a push plate, a fixed block and a first spring. The top of the motor is rotatably connected to a gear, and the side of the gear is engaged with a rack for driving the movable bed to move. Both sides of the rack are provided with fixing holes for fixing with the fixed block. The bottom of the movable bed is fixedly connected to two fixed seats, and a first cavity is provided inside the fixed seat. The fixed block is directly slidably connected to the first cavity. The fixed block is fixedly connected to the push plate, and a first spring is provided on the side of the push plate away from the fixed block.

[0008] Preferably, the movable bed is located on the side of the rack close to the gear, the fixing hole is located at one end of the rack close to the gear, the two fixing blocks respectively penetrate the two first cavities and extend to the side of the two fixing seats close to each other, the push plate penetrates the inner wall of the first cavity and extends to the side of the fixing seat away from the rack, the side of the push plate away from the fixed block is elastically connected to the inner wall of the first cavity through the first spring, the fixing block is provided with an inclined surface, and the side surface on the fixing block is located on the side of the fixing block close to the rack.

[0009] Preferably, a bed mechanism is provided on the side of the coil scanner, and the movable mechanism is located above the bed mechanism. The bed mechanism includes a bed body, a first slide groove is provided on the top of the bed body, a second cavity is provided on the inner wall of the first slide groove, a trapezoidal block is slidably connected to the interior of the second cavity, and a second spring is fixedly connected to the bottom of the trapezoidal block.

[0010] Preferably, the trapezoidal block is slidingly connected to the second cavity, the bottom of the trapezoidal block is elastically connected to the inner wall of the second cavity through a second spring, the top of the trapezoidal block passes through the inner wall of the second cavity and extends to the inside of the first slide groove, and the trapezoidal block is in the shape of a right-angled trapezoid.

[0011] Preferably, a fixing groove is provided at the bottom of the movable bed, and two slides are fixedly connected to the bottom of the movable bed.

[0012] Preferably, the top of the trapezoidal block is engaged with the fixing groove, and the slide plate is slidably connected to the top of the bed body.

[0013] Preferably, the fixed seat is slidably connected to the first slide groove, the motor is located on the side of the bed body, the push plate passes through the inner wall of the first slide groove and extends to the side of the bed body away from the motor, and the inclined surface on the trapezoidal block is located on the side of the trapezoidal block close to the rack.

[0014] Preferably, a main body mechanism is provided on the side of the coil scanner, and the main body mechanism is located on the side of the bed mechanism. The main body mechanism includes a base, and the top of the base is slidably connected to a scanning bed. Two second slide grooves are provided on the top of the scanning bed, and two baffles are slidably connected inside the scanning bed, and a third spring is fixedly connected between the two baffles.

[0015] Preferably, the sides of the two baffles that are close to each other are elastically connected via a third spring, and the sides of the two baffles that are away from each other both penetrate the inner wall of the scanning bed and extend to the inside of the two second sliding grooves respectively.

[0016] Preferably, a slope is provided on the side of the baffle close to the bed body, the size of the slide is adapted to the size of the second slide groove, the rack is slidably connected to the inside of the base, the gear is rotatably connected to the inside of the base, and the motor is fixedly connected to the bottom of the base.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention facilitates the transfer and scanning of patients by arranging the coordination of structures such as the rack and the movable bed. When the patient is in a coma or seriously injured and unable to move, the motor is started to drive the rack to drive the movable bed on the main body of the hospital bed where the patient is lying to the scanning bed, so that the immobile patient can be smoothly transferred from the hospital bed to the scanning bed, avoiding the secondary injury that may be caused by manual handling, saving manpower, and allowing the patient to undergo scanning examinations such as MRI more conveniently, helping the doctor to obtain the patient's condition information in a timely and accurate manner, allowing the patient to complete the position change in a relatively stable state, and reducing the pain and discomfort caused to the injured part by bumps or shaking, thereby improving the patient's medical experience and comfort to a certain extent, and facilitating the patient's scanning.

[0019] The present invention facilitates shielding of the second slide groove when the auxiliary structure is not in use by arranging the cooperation of structures such as the second slide groove and the baffle, so that the patient's body will not touch the second slide groove during the scanning process, avoiding discomfort such as bumping and squeezing caused by the edge of the slide groove, helping the patient to stay relaxed during the scanning, improving the cooperation of the scanning, and ensuring the smooth progress of the scanning process. At the same time, during the movement of the movable bed, the first cavity at the bottom of the movable bed will slide with the second slide groove and squeeze the inclined surface on the baffle. By squeezing the inclined surface, the baffle moves from the second slide groove to the inside of the scanning bed and squeezes the third spring, completing the position limitation of the movable bed, which can effectively prevent the movable bed from accidentally sliding due to factors such as patient movement and equipment vibration during the scanning process, ensure the position stability of the movable bed during scanning, and provide protection for the scanning equipment to obtain high-quality images;

[0020] The present invention designs a bed mechanism that is compatible with the auxiliary scanning structure, so that the patient can be smoothly transferred from the bed to the scanning bed without complicated carrying movements. This greatly reduces the transfer time, improves the overall examination efficiency, avoids the impact of delays in the transfer process on the timeliness of diagnosis, and at the same time increases the functionality of the bed and the scope of application of the auxiliary device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the main mechanism of the present invention;

[0022] Figure 2 This is a bottom view of the structure of the hospital bed mechanism of the present invention;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the main mechanism of the present invention;

[0024] Figure 4 Schematic diagram of the cross-sectional structure of the moving mechanism of the present invention;

[0025] Figure 5 For the present invention Figure 4 A in the middle is an enlarged structural diagram;

[0026] Figure 6 This is a schematic cross-sectional structure diagram of the hospital bed mechanism of the present invention;

[0027] Figure 7 This is a schematic diagram of the structural relationship between the trapezoidal block and the fixing groove of the present invention;

[0028] Figure 8 It is a schematic diagram of the explosion structure of the mobile mechanism of the present invention.

[0029] In the figure: 1. Moving mechanism; 101. Motor; 102. Gear; 103. Rack; 104. Fixing hole; 105. Moving bed; 106. Fixing seat; 107. First cavity; 108. Push plate; 109. Fixing block; 110. First spring; 2. Bed mechanism; 201. Bed body; 202. Second cavity; 203. Second spring; 204. Trapezoidal block; 205. First slide; 206. Fixing slot; 207. Slide plate; 3. Main body mechanism; 301. Base; 302. Scanning bed; 303. Second slide; 304. Baffle; 305. Third spring; 4. Coil scanner. DETAILED DESCRIPTION

[0030] 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.

[0031] like Figures 1 to 8 As shown, the present invention provides a magnetic resonance radio frequency coil scanning auxiliary device, including a coil scanner 4, and further comprising:

[0032] The moving mechanism 1 is located on the side of the coil scanner 4;

[0033] Among them, the moving mechanism 1 includes a motor 101, a gear 102, a rack 103, a fixing hole 104, a moving bed 105, a fixing seat 106, a first cavity 107, a push plate 108, a fixed block 109 and a first spring 110. The top of the motor 101 is rotatably connected to the gear 102, and the side of the gear 102 is engaged with the rack 103 for driving the moving bed 105 to move. Both sides of the rack 103 are provided with fixing holes 104 for fixing with the fixing block 109. The bottom of the moving bed 105 is fixedly connected to two fixing seats 106, and a first cavity 107 is provided inside the fixing seat 106. The fixing block 109 is directly slidably connected to the first cavity 107. The push plate 108 is fixedly connected to the fixed block 109, and a first spring 110 is provided on the side of the push plate 108 away from the fixed block 109.

[0034] The movable bed 105 is located on the side of the rack 103 close to the gear 102, the fixing hole 104 is located at one end of the rack 103 close to the gear 102, the two fixing blocks 109 respectively penetrate the two first cavities 107 and extend to the side of the two fixing seats 106 close to each other, the push plate 108 penetrates the inner wall of the first cavity 107 and extends to the side of the fixing seat 106 away from the rack 103, and the side of the push plate 108 away from the fixing block 109 is elastically connected to the inner wall of the first cavity 107 through the first spring 110. An inclined surface is provided on the fixing block 109, and the side surface on the fixing block 109 is located on the side of the fixing block 109 close to the rack 103.

[0035] A bed mechanism 2 is provided on the side of the coil scanner 4, and the mobile mechanism 1 is located above the bed mechanism 2. The bed mechanism 2 includes a bed body 201, a first slide groove 205 is provided on the top of the bed body 201, and a second cavity 202 is provided on the inner wall of the first slide groove 205. A trapezoidal block 204 is slidably connected to the interior of the second cavity 202, and a second spring 203 is fixedly connected to the bottom of the trapezoidal block 204. A fixed groove 206 is provided at the bottom of the mobile bed 105, and two slides 207 are fixedly connected to the bottom of the mobile bed 105.

[0036] The above solution is adopted: by setting the coordination of structures such as the rack 103 and the mobile bed 105, it is convenient to transfer and scan the patient. When the patient is in a coma or seriously injured and unable to move, the motor 101 is started to rotate the gear 102. The rotation of the gear 102 will drive the rack 103 engaged therewith to move in the direction close to the bed body 201. After the rack 103 moves into the first slide groove 205, it will first abut against the trapezoidal block 204, and by squeezing the inclined surface on the trapezoidal block 204, the trapezoidal block 204 is moved downward in the second cavity 202, squeezing the second spring 203 and releasing the engagement between the top of the trapezoidal block 204 and the fixed groove 206. At this time, after the trapezoidal block 204 is retracted into the second cavity 202, the second spring 203 continues to move to squeeze the inclined surface on the fixed block 109, so that the fixed block 109 is retracted into the first cavity 107 and squeezes the first spring 110 until the rack 103 and the second slide groove 205 are aligned. When the inner wall of the slide groove 205 abuts against each other, the fixing hole 104 on the rack 103 is aligned with the fixing block 109. At this time, the fixing block 109 is engaged with the fixing hole 104 under the action of the elastic force of the first spring 110. Then, the motor 101 causes the gear 102 to rotate in the opposite direction, and the rack 103 can drive the movable bed 105 to move toward the scanning bed 302, and finally drive the patient to move above the scanning bed 302, so that the patient who cannot move can be smoothly transferred from the bed to the scanning bed 302, avoiding the secondary injury that may be caused by manual handling, saving manpower, and allowing the patient to receive MRI and other scanning examinations more conveniently, which helps the doctor to obtain the patient's condition information in a timely and accurate manner. Allowing the patient to complete the position change in a relatively stable state can reduce the pain and discomfort caused to the injured part due to bumps or shaking, thereby improving the patient's medical experience and comfort to a certain extent, and facilitating the patient's scanning.

[0037] like Figures 3 to 8 As shown, the trapezoidal block 204 is slidably connected to the second cavity 202, the bottom of the trapezoidal block 204 is elastically connected to the inner wall of the second cavity 202 through the second spring 203, the top of the trapezoidal block 204 passes through the inner wall of the second cavity 202 and extends to the inside of the first slide groove 205, the trapezoidal block 204 is in a right-angled trapezoid, the top of the trapezoidal block 204 is engaged with the fixed groove 206, the slide plate 207 is slidably connected to the top of the bed body 201, the fixed seat 106 is slidably connected to the first slide groove 205, the motor 101 is located on the side of the bed body 201, the push plate 108 passes through the inner wall of the first slide groove 205 and extends to the side of the bed body 201 away from the motor 101, and the inclined surface on the trapezoidal block 204 is located on the side of the trapezoidal block 204 close to the rack 103.

[0038] A main body mechanism 3 is provided on the side of the coil scanner 4. The main body mechanism 3 is located on the side of the bed mechanism 2. The main body mechanism 3 includes a base 301. The top of the base 301 is slidably connected to the scanning bed 302. Two second slide grooves 303 are provided on the top of the scanning bed 302. Two baffles 304 are slidably connected inside the scanning bed 302. A third spring 305 is fixedly connected between the two baffles 304. The sides of the two baffles 304 that are close to each other are elastically connected by the third spring 305. The sides of the two baffles 304 that are away from each other both penetrate the inner wall of the scanning bed 302 and extend to the inside of the two second slide grooves 303 respectively. An inclined surface is provided on the side of the baffle 304 close to the bed body 201. The size of the slide plate 207 is adapted to the size of the second slide groove 303. The rack 103 is slidably connected to the inside of the base 301. The gear 102 is rotatably connected to the inside of the base 301. The motor 101 is fixedly connected to the bottom of the base 301.

[0039] The above solution is adopted: by providing the cooperation of the second slide groove 303 and the baffle 304 and other structures, it is convenient to shield the second slide groove 303 when the auxiliary structure is not in use, so that the patient's body will not touch the second slide groove 303 during the scanning process, avoiding the discomfort such as bumping and squeezing caused by the edge of the second slide groove 303, helping the patient to stay relaxed during the scanning, improving the scanning cooperation, and ensuring the smooth progress of the scanning process. At the same time, during the movement of the movable bed 105, the first cavity 107 at the bottom of the movable bed 105 will slide with the second slide groove 303 and squeeze the inclined surface on the baffle 304. By squeezing the inclined surface, the baffle 304 moves from the second slide groove 303 to the inside of the scanning bed 302 and squeezes the third spring 305, completing the position limitation of the movable bed 105, effectively preventing the movable bed 105 from accidentally sliding due to factors such as patient movement and equipment vibration during the scanning process, ensuring the position stability of the movable bed during scanning, and providing a guarantee for the scanning equipment to obtain high-quality images;

[0040] By designing a bed mechanism 2 that is compatible with the auxiliary scanning structure, the patient can be smoothly transferred from the bed to the scanning bed 302 without complicated carrying movements. This greatly reduces the transfer time, improves the overall examination efficiency, avoids the impact of delays in the transfer process on the timeliness of diagnosis, and at the same time increases the functionality of the bed and the scope of application of the auxiliary device.

[0041] The working principle and usage process of the present invention are as follows: first, the patient only needs to lie on the scanning bed 302, and then the driving system moves the scanning bed 302 in the direction close to the coil scanner 4, and the coil scanner 4 is started to scan the patient passing through it;

[0042] When the patient is in a coma or seriously injured and cannot move, the bed body 201 on which the patient is lying can be pushed to the side of the base 301 close to the motor 101, and the slide plate 207 is aligned with the second slide groove 303. At this time, the motor 101 is started to rotate the gear 102. The rotation of the gear 102 will drive the rack 103 engaged therewith to move in the direction close to the bed body 201. After the rack 103 moves to the inside of the first slide groove 205, it will first abut against the trapezoidal block 204, and by squeezing the inclined surface on the trapezoidal block 204, the trapezoidal block 204 is made to move downward in the second cavity 202, squeezing the second spring 203 and releasing the top of the trapezoidal block 204 from the fixed groove 206. In addition to the engagement, after the trapezoidal block 204 is retracted into the second cavity 202, the second spring 203 continues to move to press the inclined surface on the fixed block 109, causing the fixed block 109 to retract into the first cavity 107 and squeeze the first spring 110 until the rack 103 abuts against the inner wall of the first slide groove 205, and the fixing hole 104 on the rack 103 is aligned with the fixed block 109. At this time, the fixed block 109 is engaged with the fixing hole 104 under the action of the elastic force of the first spring 110. Subsequently, the motor 101 rotates the gear 102 in the opposite direction, and the rack 103 drives the movable bed 105 to move toward the scanning bed 302, and finally moves it above the scanning bed 302.

[0043] During the movement of the movable bed 105, the first cavity 107 at the bottom of the movable bed 105 slides with the second chute 303 and presses the inclined surface of the baffle 304. By pressing the inclined surface, the baffle 304 moves from the second chute 303 into the interior of the scanning bed 302 and presses the third spring 305, thus limiting the position of the movable bed 105. Then, the scanning bed 302 drives the movable bed 105 above it to move closer to the coil scanner 4 through the drive system, so that a critically ill patient can be scanned without moving the patient.

[0044] After the scan is completed, it is only necessary to drive the movable bed 105 to move back to the top of the bed body 201 by the rack 103, and push the push plate 108 in the direction away from the rack 103 to drive the fixing block 109 to disengage from the fixing hole 104. Then, the rack 103 is retracted into the inside of the base 301 through transmission. At this time, the trapezoidal block 204 will be engaged with the fixing groove 206 under the action of the elastic force of the second spring 203, so that the movable bed 105 is fixed on the bed body 201. Then, the bed body 201 is moved to take the patient back to the ward.

[0045] 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 any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

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

Claims

1. A magnetic resonance radio frequency coil scanning auxiliary device, comprising a coil scanner (4), characterized in that: Also includes: A moving mechanism (1), wherein the moving mechanism (1) is located on a side of the coil scanner (4); The moving mechanism (1) comprises a motor (101), a gear (102), a rack (103), a fixing hole (104), a movable bed (105), a fixing seat (106), a first cavity (107), a push plate (108), a fixing block (109) and a first spring (110). The top of the motor (101) is rotatably connected to the gear (102). The side of the gear (102) is engaged with the rack (103) for driving the movable bed (105). 3) are provided with fixing holes (104) on both sides for fixing with a fixing block (109), the bottom of the movable bed (105) is fixedly connected with two fixing seats (106), a first cavity (107) is provided inside the fixing seat (106), the fixing block (109) is directly slidably connected to the first cavity (107), a push plate (108) is fixedly connected to the fixing block (109), and a first spring (110) is provided on the side of the push plate (108) away from the fixing block (109).

2. The magnetic resonance radio frequency coil scanning auxiliary device according to claim 1, characterized in that: The movable bed (105) is located on a side of the rack (103) close to the gear (102), the fixing hole (104) is located at one end of the rack (103) close to the gear (102), the two fixing blocks (109) respectively penetrate the two first cavities (107) and extend to the side of the two fixing seats (106) close to each other, the push plate (108) penetrates the inner wall of the first cavity (107) and extends to the side of the fixing seat (106) away from the rack (103), and the side of the push plate (108) away from the fixing block (109) is elastically connected to the inner wall of the first cavity (107) through the first spring (110).

3. The magnetic resonance radio frequency coil scanning auxiliary device according to claim 1, characterized in that: A bed mechanism (2) is provided on the side of the coil scanner (4), and the moving mechanism (1) is located above the bed mechanism (2). The bed mechanism (2) includes a bed body (201), a first slide groove (205) is provided on the top of the bed body (201), a second cavity (202) is provided on the inner wall of the first slide groove (205), a trapezoidal block (204) is slidably connected to the interior of the second cavity (202), and a second spring (203) is fixedly connected to the bottom of the trapezoidal block (204).

4. The magnetic resonance radio frequency coil scanning auxiliary device according to claim 3, characterized in that: The trapezoidal block (204) is slidably connected to the second cavity (202); the bottom of the trapezoidal block (204) is elastically connected to the inner wall of the second cavity (202) via a second spring (203); the top of the trapezoidal block (204) passes through the inner wall of the second cavity (202) and extends to the interior of the first sliding groove (205); and the trapezoidal block (204) is in the shape of a right-angled trapezoid.

5. The magnetic resonance radio frequency coil scanning auxiliary device according to claim 3, characterized in that: A fixing groove (206) is provided at the bottom of the movable bed (105), and two slide plates (207) are fixedly connected to the bottom of the movable bed (105).

6. The magnetic resonance radio frequency coil scanning auxiliary device according to claim 5, characterized in that: The top of the trapezoidal block (204) is engaged with the fixing groove (206), and the slide plate (207) is slidably connected with the top of the hospital bed body (201).

7. The magnetic resonance radio frequency coil scanning auxiliary device according to claim 5, characterized in that: The fixing seat (106) is slidably connected to the first chute (205), the motor (101) is located on the side of the bed body (201), the push plate (108) passes through the inner wall of the first chute (205) and extends to the side of the bed body (201) away from the motor (101), and the inclined surface on the trapezoidal block (204) is located on the side of the trapezoidal block (204) close to the rack (103).

8. The magnetic resonance radio frequency coil scanning auxiliary device according to claim 5, characterized in that: A main body mechanism (3) is provided on the side of the coil scanner (4), and the main body mechanism (3) is located on the side of the bed mechanism (2). The main body mechanism (3) includes a base (301), and the top of the base (301) is slidably connected to a scanning bed (302). Two second sliding grooves (303) are provided on the top of the scanning bed (302). Two baffles (304) are slidably connected inside the scanning bed (302), and a third spring (305) is fixedly connected between the two baffles (304).

9. The magnetic resonance radio frequency coil scanning auxiliary device according to claim 8, characterized in that: The sides of the two baffles (304) that are close to each other are elastically connected via a third spring (305), and the sides of the two baffles (304) that are away from each other both penetrate the inner wall of the scanning bed (302) and extend to the inside of the two second slide grooves (303).

10. The magnetic resonance radio frequency coil scanning auxiliary device according to claim 8, characterized in that: The baffle (304) is provided with an inclined surface on a side close to the bed body (201); the size of the slide plate (207) is adapted to the size of the second slide groove (303); the rack (103) is slidably connected to the inside of the base (301); the gear (102) is rotatably connected to the inside of the base (301); and the motor (101) is fixedly connected to the bottom of the base (301).

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