Front and back positioning device for magnetic resonance sickbed

Abstract

The utility model relates to the technical field of magnetic resonance equipment, in particular to a magnetic resonance sickbed front and back positioning device which comprises a base detachably installed on the edge of a bed board, a base stop block is arranged in the middle of the outer side wall of the base, and a center shaft penetrates through the lower portion of the base and is fixedly installed. A first clamping plate and a second clamping plate which are clamped together and used in cooperation are rotationally installed on the center shaft, a first locking rack is arranged at the lower end of the first clamping plate, a second locking rack is arranged at the lower end of the second clamping plate, and a wire pulling device is installed between the first clamping plate pulling block and the second clamping plate pulling block. The bed further comprises a toothed rail parallel to the bed board, a plurality of tooth grooves matched with the first locking rack and the second locking rack for use are evenly distributed in the toothed rail, and the first locking rack and the second locking rack can be controlled to be positioned front and back through a wire pulling device. The device has the advantages of high precision, high stability, high repeatability, easiness in installation and maintenance, strong adaptability, long service life, low noise and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic resonance equipment, in particular to a front and rear positioning device for a magnetic resonance bed. Background Art

[0002] During an MRI examination, the patient needs to be moved to the center of the magnet, which usually requires the assistance of a hospital bed. Existing MRI beds usually use electric drive, and the motor is driven and controlled by an electric control device to achieve the movement of the bed board. However, when an electric bed fails, the bed control will fail, and the electromagnetic generated by the motor drive will also affect the uniformity of the magnetic field, which will cause inconvenience to doctors and patients.

[0003] Therefore, the design of a manual MRI bed is particularly important. The design of a manual MRI bed needs to take into account the convenience and comfort of patient transportation, as well as the accuracy of the examination. The manual bed uses a mechanical structure or a simple operating device to enable medical staff to easily move the bed and accurately position the patient in the center of the magnet. At the same time, the manual bed also needs to be stable and safe to ensure that the bed does not shake or move during the examination, thereby ensuring the safety of the patient and the accuracy of the examination. In summary, a manual MRI bed requires expertise in both MRI imaging technology and bed design, aiming to improve the efficiency and accuracy of MRI examinations while ensuring the safety and comfort of patients. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a front and rear positioning device for a magnetic resonance imaging bed, which can manually and accurately control the movement of the bed and has the advantages of high precision, high stability, high repeatability, easy installation and maintenance, strong adaptability, long life and low noise, so as to position the patient to the best position during the scanning process and ensure the imaging quality and patient safety.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a front and rear positioning device for a magnetic resonance bed, comprising a base detachably mounted on the edge of a bed board, a base stopper is provided at the middle of the outer side wall of the base, a central axis is fixedly installed through the lower part of the base, a first clamping plate and a second clamping plate that are engaged together and used together are rotatably installed on the central axis, a first locking rack is provided at the lower end of the first clamping plate, a first clamping plate pull block is provided at the upper end of the first clamping plate, a first tension spring is installed between the first clamping plate pull block and the base; a second locking rack is provided at the lower end of the second clamping plate, and a second clamping plate is provided at the upper end of the second clamping plate A plate pulling block, a second tension spring is installed between the second plate pulling block and the base; a wire pulling device is installed between the first plate pulling block and the second plate pulling block; it also includes a rack parallel to the bed board, and the rack is evenly distributed with a plurality of tooth grooves used in conjunction with the first locking rack and the second locking rack. When the wire pulling device is pulled, the first locking rack and the second locking rack are disengaged from the rack, and the bed board can move forward and backward along the rack. When the wire pulling device is released, the first locking rack and the second locking rack are respectively engaged with the rack, and the bed board is fixed on the rack and cannot move forward and backward.

[0006] As a preferred technical solution, a first mounting plate is provided at the center of the first clamping plate, a first clamping plate mounting hole is opened on the first mounting plate, and the first clamping plate mounting hole is sleeved on the central axis; a second mounting plate is provided at the center of the second clamping plate, a second clamping plate mounting hole is opened on the second mounting plate, and the second clamping plate mounting hole is sleeved on the central axis.

[0007] As a preferred technical solution, the angle between the first locking rack and the first clamping plate pull block is an acute angle, and the angle between the second locking rack and the second clamping plate pull block is also an acute angle.

[0008] As a preferred technical solution, both side surfaces of the base stopper are inclined surfaces, and their inclination angles are adapted to the angle between the first card plate pull block and the second card plate pull block. When the first card plate pull block and the second card plate pull block approach the base stopper at the same time, they can both fit tightly with its side surfaces.

[0009] As a preferred technical solution, a side of the first mounting plate close to the second mounting plate is recessed inward, and a side of the second mounting plate close to the first mounting plate is also recessed inward. When the first mounting plate is in contact with the second mounting plate, the first card plate pull block and the second card plate pull block are arranged front to back oppositely, and the first locking rack is also arranged front to back oppositely on the rack rail with the second locking rack.

[0010] As a preferred technical solution, a base center axis positioning hole is provided at the lower portion of the base, and the center axis is installed through the base center axis positioning hole, and a center axis locking nut is fixedly installed at one end of the center axis close to the bed board, and a spring washer is installed on the center axis between the center axis locking nut and the base; a wear-resistant copper sleeve and a polyurethane buffer sleeve are sequentially sleeved from the inside to the outside at one end of the center axis away from the bed board, and the polyurethane buffer sleeve is respectively fitted with the first clamping plate mounting hole and the second clamping plate mounting hole, and the ends of the center axis are fixed in sequence by locking screws and retaining rings.

[0011] As a preferred technical solution, the wire pulling device includes a wire pulling fixing sleeve, in which a wire pulling wire is movably installed, and a wire pulling terminal is provided at the free end of the wire pulling wire. A wire pulling locking groove is provided on the first card plate pull block, and the wire pulling terminal is installed in the wire pulling locking groove. A wire pulling pressure plate for sealing the wire pulling locking groove is installed on the first card plate pull block; a wire pulling sleeve fixing hole is provided on the second card plate pull block, and the wire pulling sleeve is fixedly installed in the wire pulling sleeve fixing hole.

[0012] As a preferred technical solution, the base is L-shaped, the cover is buckled on the edge of the bed board, and a plurality of base mounting holes are provided on the base.

[0013] As a preferred technical solution, the two ends of the outer side wall of the base are respectively provided with a first tension spring base tension bolt and a second tension spring base tension bolt, the first clamping plate pull block is provided with a first tension spring pull block tension bolt, and the second clamping plate pull block is provided with a second tension spring pull block tension bolt, the two ends of the first tension spring are respectively hung on the first tension spring base tension bolt and the first tension spring pull block tension bolt, and the two ends of the second tension spring are respectively hung on the second tension spring base tension bolt and the second tension spring pull block tension bolt.

[0014] Due to the adoption of the above technical scheme, a front and rear positioning device for a magnetic resonance bed includes a base detachably mounted on the edge of a bed board, a base stopper is provided in the middle of an outer side wall of the base, a central axis is fixedly installed through the lower part of the base, a first clamping plate and a second clamping plate that are engaged together and used together are rotatably installed on the central axis, a first locking rack is provided at the lower end of the first clamping plate, a first clamping plate pull block is provided at the upper end of the first clamping plate, and a first tension spring is installed between the first clamping plate pull block and the base; a second locking rack is provided at the lower end of the second clamping plate, a second clamping plate pull block is provided at the upper end of the second clamping plate, and a second tension spring is installed between the second clamping plate pull block and the base; the first clamping plate A wire pulling device is installed between the pulling block and the second card plate pulling block; it also includes a rack parallel to the bed board, and the rack is evenly distributed with a number of tooth grooves used in conjunction with the first locking rack and the second locking rack. When the wire pulling device is pulled, the first locking rack and the second locking rack are disengaged from the rack, and the bed board can move forward and backward along the rack; when the wire pulling device is released, the first locking rack and the second locking rack are respectively engaged with the rack, and the bed board is fixed on the rack and cannot move forward and backward; the beneficial effect of the utility model is that by installing the utility model on the edge of the bed body, the first card plate and the second card plate ensure the accuracy and reliability of positioning from the front and back respectively.

[0015] (1) The setting of racks and toothed tracks, where each tooth represents a fixed position or distance, can easily determine the position by counting the number of teeth, thus achieving high-precision positioning;

[0016] (2) The contact area between the rack and the rack rail is relatively large, which makes the connection between them more stable. This stability reduces the position deviation caused by vibration, impact or external force, thereby ensuring the reliability and high stability of the system;

[0017] (3) Due to the standardization of the rack structure, almost the same results can be obtained each time positioning is performed, which is very important for applications that require frequent repeated positioning because it ensures the consistency, predictability and high repeatability of the system;

[0018] (4) The relative simplicity of the rack design makes them easy to install on existing equipment or machines. In addition, if a problem occurs, the rack is relatively easy to replace or repair, reducing maintenance costs and downtime. It is easy to install and maintain;

[0019] (5) The rack design can adapt to various environments and working conditions. By selecting appropriate materials and coatings, the rack can withstand the influence of high temperature, high pressure, corrosion or other harsh environments and has strong adaptability;

[0020] (6) Racks generally have high wear and corrosion resistance, which means they can be used for a long time without frequent replacement, which reduces maintenance costs and increases the overall life of the system;

[0021] (7) The noise generated by rack positioning is lower.

[0022] In summary, the utility model adopts the first locking rack and the second locking rack for front and rear positioning, and has the advantages of high precision, high stability, high repeatability, easy installation and maintenance, strong adaptability, long life and low noise, etc. These advantages make it widely welcomed in industrial and commercial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0024] Figure 1 It is a structural schematic diagram of a front and rear positioning device for a magnetic resonance bed of the utility model;

[0025] Figure 2 yes Figure 1 A partial enlarged view of point I in the middle;

[0026] Figure 3 yes Figure 1 The schematic diagram of the structure after the upper pull-wire device is installed at position I in the middle;

[0027] Figure 4 It is an exploded view of a front and rear positioning device of a magnetic resonance bed of the utility model;

[0028] Figure 5 It is a structural schematic diagram of the wire pulling device of the utility model.

[0029] In the figure: 1-base; 11-base stopper; 12-first tension spring base pull bolt; 13-second tension spring base pull bolt; 14-base center axis positioning hole; 15-base mounting hole; 2-first card; 21-first locking rack; 22-first card mounting hole; 23-first card pull block; 24-first tension spring pull block pull bolt; 25-pull wire locking groove; 26-pull wire pressure plate mounting hole; 3-second card; 31-second locking rack; 32-second card mounting hole; 3 3-second card plate pull block; 34-second tension spring pull block pull bolt; 35-wire sleeve fixing hole; 4-first tension spring; 5-second tension spring; 6-wire pressure plate; 61-wire pressure plate screw; 7-center axis; 71-wear-resistant copper sleeve; 72-polyurethane buffer sleeve; 73-locking screw; 74-retaining ring; 75-wear-resistant copper pad; 76-spring washer; 77-center axis locking nut; 8-wire; 81-wire terminal; 82-wire fixing sleeve; 9-bed board; 10-tooth rail. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and examples. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Needless to say, those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0031] like Figures 1 to 5 As shown together, a front and rear positioning device for a magnetic resonance bed comprises a base 1 detachably mounted on the edge of a bed board 9, a base stopper 11 is provided in the middle of the outer side wall of the base 1, a central shaft 7 is fixedly installed through the lower part of the base 1, a first clamping plate 2 and a second clamping plate 3 which are engaged together for use are rotatably installed on the central shaft 7, a first locking rack 21 is provided at the lower end of the first clamping plate 2, a first clamping plate pull block 23 is provided at the upper end of the first clamping plate 2, a first tension spring 4 is installed between the first clamping plate pull block 23 and the base 1; a second locking rack 21 is provided at the lower end of the second clamping plate 3, and a first locking rack 21 is provided at the lower end of the first clamping plate 2. A rack 31, a second card plate pull block 33 is provided at the upper end of the second card plate 3, a second tension spring 5 is installed between the second card plate pull block 33 and the base 1; a wire pulling device is installed between the first card plate pull block 23 and the second card plate pull block 33; it also includes a rack 10 arranged parallel to the bed board 9, and a plurality of tooth grooves are evenly distributed on the rack 10 for use with the first locking rack 21 and the second locking rack 31. The first locking rack 21 and the second locking rack 31 preferably include two tooth grooves each, and the first locking rack 21 and the second locking rack 31 can also be replaced by gears. When the pulling wire device is pulled, the first locking rack 21 and the second locking rack 31 disengage from the rack 10, and the bed board 9 can move forward and backward along the rack 10; when the pulling wire device is released, the first locking rack 21 and the second locking rack 31 respectively engage with the rack 10, and the bed board 9 is fixed on the rack 10 and cannot move forward and backward; by installing the utility model on the edge of the bed body, the first clamping plate 2 and the second clamping plate 3 ensure the accuracy and reliability of positioning from the front and back respectively.

[0032] The utility model also needs to meet the following requirements during processing:

[0033] Pitch accuracy: The pitch of the tooth grooves on the rack 10 and the pitch accuracy of the first locking rack 21 and the second locking rack 31 are key factors affecting positioning accuracy. Even a slight difference in the pitch may lead to inaccurate positioning. Therefore, during the manufacturing process, it is necessary to ensure that the pitch accuracy meets the design requirements and conduct strict testing and screening.

[0034] Tooth shape matching: Tooth shape matching is also the key to positioning accuracy. If the tooth shape does not match, the gap between the teeth will be too large or too small, affecting the accuracy and stability of positioning. Therefore, during the design and manufacturing process, it is necessary to ensure the consistency of the tooth shape and consider the tolerance and fit clearance between the teeth.

[0035] Installation accuracy: The installation accuracy of the rack 10 and the first locking rack 21 and the second locking rack 31 is also a key factor in positioning accuracy. During the installation process, it is necessary to ensure that the installation position, angle, and tightening force of the first locking rack 21 and the second locking rack 31 on the rack 10 meet the design requirements to avoid inaccurate positioning due to installation errors.

[0036] Lubrication and cleaning: The first locking rack 21 and the second locking rack 31 need to be kept in a good lubrication and clean state during the movement on the rack rail 10. Lubrication can reduce friction and wear between teeth, improve positioning accuracy and life; cleaning can prevent dust and impurities from accumulating between teeth, affecting positioning accuracy and stability.

[0037] Preload adjustment: The first locking rack 21, the second locking rack 31 and the rack rail 10 need to maintain appropriate preload during the positioning process. Too little preload will cause too much gap between teeth, affecting the positioning accuracy; too much preload will increase friction and wear between teeth, reducing positioning accuracy and life. Therefore, the preload needs to be adjusted according to the actual situation.

[0038] In summary, the key points for positioning the first locking rack 21 and the second locking rack 31 with the rack rail 10 respectively include pitch accuracy, tooth profile matching, installation accuracy, lubrication and cleaning, and preload adjustment. In the design and manufacturing process, these factors need to be considered comprehensively, and effective measures need to be taken to ensure positioning accuracy and stability.

[0039] like Figure 1 and Figure 4 As shown together, a first mounting plate is provided at the center of the first cardboard 2, a first cardboard mounting hole 22 is provided on the first mounting plate, and the first cardboard mounting hole 22 is sleeved on the central shaft 7. A second mounting plate is provided at the center of the second cardboard 3, a second cardboard mounting hole 32 is provided on the second mounting plate, and the second cardboard mounting hole 32 is sleeved on the central shaft 7. The first cardboard 2 and the second cardboard 3 are rotatably mounted on the central shaft 7 through the first cardboard mounting hole 22 and the second cardboard mounting hole 32, respectively.

[0040] like Figures 1 to 3 As shown together, the angle between the first locking rack 21 and the first card plate pull block 23 is an acute angle, and the angle between the second locking rack 31 and the second card plate pull block 33 is also an acute angle. Preferably, the angle of the acute angle is 60° to 80°.

[0041] like Figures 1 to 3 As shown together, both sides of the base stopper 11 are inclined surfaces, and their inclination angles are adapted to the angle between the first card plate pull block 23 and the second card plate pull block 33. When the first card plate pull block 23 and the second card plate pull block 33 are simultaneously moved toward the base stopper 11, they can both fit tightly with its side surfaces. When it is necessary to disengage the first locking rack 21 and the second locking rack 31 from the rack rail 10, a pulling force is applied to the wire pulling device through the handle, so that the first card plate pull block 23 and the second card plate pull block 33 are simultaneously moved toward the base stopper 11, and fit tightly with the side surfaces of the base stopper 11, so that the first card plate pull block 23 and the second card plate pull block 33 can be ensured to be in the middle of the base 1 while being moved toward each other, and the first locking rack 21 and the second locking rack 31 can be ensured to be disengaged from the rack rail 10.

[0042] like Figures 1 to 4 As shown together, the side of the first mounting plate close to the second mounting plate is recessed inwards, and the side of the second mounting plate close to the first mounting plate is also recessed inwards. When the first mounting plate is fitted with the second mounting plate, the first card plate pull block 23 and the second card plate pull block 33 are arranged front and back oppositely, and the first locking rack 21 and the second locking rack 31 are also arranged front and back oppositely on the rack rail 10. The thickness of the first mounting plate is equal to half of the thickness of the first card plate pull block 23, and the thickness of the second mounting plate is equal to half of the thickness of the second card plate pull block 33.

[0043] like Figures 1 to 4As shown together, the lower part of the base 1 is provided with a base center axis positioning hole 14, and the center axis 7 is installed in the base center axis positioning hole 14 through the center axis 7. The end of the center axis 7 close to the bed plate 9 is fixedly installed with a center axis locking nut 77, and a spring washer 76 is installed on the center axis 7 between the center axis locking nut 77 and the base 1; the end of the center axis 7 away from the bed plate 9 is sequentially sleeved with a wear-resistant copper sleeve 71 and a polyurethane buffer sleeve 72 from the inside to the outside, and the polyurethane buffer sleeve 72 is respectively fitted with the first cardboard mounting hole 22 and the second cardboard mounting hole 32, and the end of the center axis 7 is fixed by a locking screw 73 and a retaining ring 74 in turn. Since the wear-resistant copper sleeve 71 is in direct contact with the center axis 7, and since the wear-resistant copper sleeve 71 is fixedly connected with the first cardboard 2 and the second cardboard 3 through the polyurethane buffer sleeve 72, when the first cardboard 2 and the second cardboard 3 rotate, the wear-resistant copper sleeve 71 will generate friction with the center axis 7, so the wear-resistant copper sleeve 71 has good wear resistance due to its material properties, and the service life is extended. The use of the polyurethane buffer sleeve 72 allows more tolerance for the rotation between the first card plate 2 and the second card plate 3 and the central shaft 7, ensuring the stability of operation. The retaining ring 74 blocks the wear-resistant copper sleeve 71 and the polyurethane buffer sleeve 72 at the end of the central shaft 7 and fixes them by locking screws 73. A wear-resistant copper pad 75 is installed between the first mounting plate and the second mounting plate. When the first card plate 2 and the second card plate 3 rotate, the wear-resistant copper pad 75 can extend the service life and avoid direct friction between the first mounting plate and the second mounting plate.

[0044] like Figures 1 to 5 As shown together, the wire pulling device includes a wire pulling fixing sleeve 82, in which a wire pulling wire 8 is movably installed, and a wire pulling terminal 81 is provided at the free end of the wire pulling wire 8. A wire pulling locking groove 25 is provided on the first card plate pull block 23, and the wire pulling terminal 81 is installed in the wire pulling locking groove 25. A wire pulling pressure plate 6 for blocking the wire pulling locking groove 25 is installed on the first card plate pull block 23; the wire pulling pressure plate screw 61 passes through the wire pulling pressure plate mounting hole 26 to fix the wire pulling pressure plate 6 on the first card plate pull block 23, and a wire pulling sleeve fixing hole 35 is provided on the second card plate pull block 33, and the wire pulling pressure plate is fixedly installed in the wire pulling sleeve fixing hole 35. The pulling wire device is a prior art, and the other end of the pulling wire 8 is connected to a handle, which is similar to the handbrake device installed on the handle of a bicycle. Pulling the handle can pull the pulling wire 8, thereby making the first card plate pull block 23 and the second card plate pull block 33 approach each other. Under the blocking action of the base stop block 11, the first card plate pull block 23 and the second card plate pull block 33 are respectively close to the two sides of the base stop block 11, ensuring that the first locking rack 21 and the second locking rack 31 are disengaged from the rack 10.

[0045] like Figure 1As shown, the base 1 is L-shaped and buckled on the edge of the bed board 9. The base 1 is provided with a plurality of base mounting holes 15. The base mounting holes 15 are preferably installed on the top surface and the outer side surface of the base 1. The screws penetrate the base mounting holes 15 to fix the base 1 on the bed body. When disassembly is required, only the screws need to be unscrewed.

[0046] like Figure 1 As shown, the two ends of the outer wall of the base 1 are respectively provided with a first tension spring base tension bolt 12 and a second tension spring base tension bolt 13, the first clamping plate pull block 23 is provided with a first tension spring pull block tension bolt 24, and the second clamping plate pull block 33 is provided with a second tension spring pull block tension bolt 34, the two ends of the first tension spring 4 are respectively hung on the first tension spring base tension bolt 12 and the first tension spring pull block tension bolt 24, and the two ends of the second tension spring 5 are respectively hung on the second tension spring base tension bolt 13 and the second tension spring pull block tension bolt 34. Figures 1 to 3 The first tension spring 4 and the second tension spring 5 are not shown to be hung on the tension bolt. This is just a schematic diagram. Those skilled in the art can fully understand the state of the first tension spring 4 and the second tension spring 5 when they are hung on the tension bolt based on the contents of the specification and the drawings.

[0047] The utility model has the following advantages:

[0048] (1) The arrangement of the rack and the rack rail 10, each tooth represents a fixed position or distance, so the position can be easily determined by counting the number of teeth, thereby achieving high-precision positioning;

[0049] (2) The contact area between the rack and the rack rail 10 is relatively large, which makes the connection between them more stable. This stability reduces the position deviation caused by vibration, impact or external force, thereby ensuring the reliability and high stability of the system;

[0050] (3) Due to the standardization of the rack structure, almost the same results can be obtained each time positioning is performed, which is very important for applications that require frequent repeated positioning because it ensures the consistency, predictability and high repeatability of the system;

[0051] (4) The relative simplicity of the rack design makes them easy to install on existing equipment or machines. In addition, if a problem occurs, the rack is relatively easy to replace or repair, reducing maintenance costs and downtime. It is easy to install and maintain;

[0052] (5) The rack design can adapt to various environments and working conditions. By selecting appropriate materials and coatings, the rack can withstand the influence of high temperature, high pressure, corrosion or other harsh environments and has strong adaptability;

[0053] (6) Racks generally have high wear and corrosion resistance, which means they can be used for a long time without frequent replacement, which reduces maintenance costs and increases the overall life of the system;

[0054] (7) The noise generated by rack positioning is lower.

[0055] In summary, the utility model adopts the first locking rack 21 and the second locking rack 31 for front and rear positioning on the rack rail 10, and has the advantages of high precision, high stability, high repeatability, easy installation and maintenance, strong adaptability, long life and low noise, etc. These advantages make it widely welcomed in industrial and commercial applications.

[0056] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A front and rear positioning device for a magnetic resonance imaging bed, characterized in that: The invention comprises a base (1) which is detachably mounted on the edge of a bed board (9), a base stopper (11) is provided at the middle of the outer wall of the base (1), a central shaft (7) is fixedly mounted through the lower part of the base (1), a first clamping plate (2) and a second clamping plate (3) which are engaged together and used together are rotatably mounted on the central shaft (7), a first locking rack (21) is provided at the lower end of the first clamping plate (2), a first clamping plate pull block (23) is provided at the upper end of the first clamping plate (2), and a first tension spring (4) is installed between the first clamping plate pull block (23) and the base (1); a second locking rack (31) is provided at the lower end of the second clamping plate (3), a second clamping plate pull block (33) is provided at the upper end of the second clamping plate (3), and the second clamping plate pull block (33) is connected to the base (1) ) is installed between the first card plate pull block (23) and the second card plate pull block (33); a wire pulling device is installed between the first card plate pull block (23) and the second card plate pull block (33); and it also includes a rack (10) arranged parallel to the bed board (9), and the rack (10) is evenly distributed with a plurality of tooth grooves used in conjunction with the first locking rack (21) and the second locking rack (31). When the wire pulling device is pulled, the first locking rack (21) and the second locking rack (31) are disengaged from the rack (10), and the bed board (9) can move forward and backward along the rack (10); when the wire pulling device is released, the first locking rack (21) and the second locking rack (31) are respectively engaged with the rack (10), and the bed board (9) is fixed on the rack (10) and cannot move forward and backward.

2. The front and rear positioning device for a magnetic resonance bed according to claim 1, characterized in that: A first mounting plate is provided at the center of the first clamping plate (2), a first clamping plate mounting hole (22) is provided on the first mounting plate, and the first clamping plate mounting hole (22) is sleeved on the central shaft (7); a second mounting plate is provided at the center of the second clamping plate (3), a second clamping plate mounting hole (32) is provided on the second mounting plate, and the second clamping plate mounting hole (32) is sleeved on the central shaft (7).

3. The front and rear positioning device for a magnetic resonance bed according to claim 1, characterized in that: The angle between the first locking rack (21) and the first clamping plate pull block (23) is an acute angle, and the angle between the second locking rack (31) and the second clamping plate pull block (33) is also an acute angle.

4. The front and rear positioning device for a magnetic resonance bed according to claim 1, characterized in that: Both side surfaces of the base stopper (11) are inclined surfaces, and their inclination angles are adapted to the angle between the first cardboard pull block (23) and the second cardboard pull block (33). When the first cardboard pull block (23) and the second cardboard pull block (33) simultaneously move toward the base stopper (11), they can both fit tightly against the side surfaces thereof.

5. The front and rear positioning device for a magnetic resonance imaging bed according to claim 2, characterized in that: A side of the first mounting plate close to the second mounting plate is recessed inwards, and a side of the second mounting plate close to the first mounting plate is also recessed inwards; when the first mounting plate is in contact with the second mounting plate, the first card plate pull block (23) and the second card plate pull block (33) are arranged front to back oppositely, and the first locking rack (21) and the second locking rack (31) are also arranged front to back oppositely on the rack rail (10).

6. The front and rear positioning device for a magnetic resonance bed according to claim 2, characterized in that: A base center axis positioning hole (14) is provided at the lower part of the base (1), and the center axis (7) is installed through the base center axis positioning hole (14). A center axis locking nut (77) is fixedly installed at one end of the center axis (7) close to the bed plate (9), and a spring washer (76) is installed on the center axis (7) between the center axis locking nut (77) and the base (1); a wear-resistant copper sleeve (71) and a polyurethane buffer sleeve (72) are sequentially sleeved from the inside to the outside at one end of the center axis (7) away from the bed plate (9), and the polyurethane buffer sleeve (72) is respectively fitted with the first cardboard mounting hole (22) and the second cardboard mounting hole (32), and the ends of the center axis (7) are fixed by locking screws (73) and retaining rings (74) in sequence.

7. The front and rear positioning device for a magnetic resonance bed according to claim 1, characterized in that: The wire pulling device comprises a wire pulling fixing sleeve (82), a wire pulling (8) being movably mounted in the wire pulling fixing sleeve (82), a wire pulling terminal (81) being provided at the free end of the wire pulling (8), a wire pulling locking groove (25) being provided on the first card plate pulling block (23), the wire pulling terminal (81) being installed in the wire pulling locking groove (25), and a wire pulling pressing plate (6) for blocking the wire pulling locking groove (25) being installed on the first card plate pulling block (23); a wire pulling sleeve fixing hole (35) being provided on the second card plate pulling block (33), the wire pulling sleeve fixing sleeve (82) being fixedly mounted in the wire pulling sleeve fixing hole (35).

8. The front and rear positioning device for a magnetic resonance bed according to claim 1, characterized in that: The base (1) is L-shaped and buckled onto the edge of the bed board (9). A plurality of base mounting holes (15) are provided on the base (1).

9. The front and rear positioning device for a magnetic resonance bed according to any one of claims 1 to 8, characterized in that: A first tension spring base pull bolt (12) and a second tension spring base pull bolt (13) are respectively provided at the two ends of the outer wall of the base (1); a first tension spring pull block pull bolt (24) is provided on the first clamping plate pull block (23); a second tension spring pull block pull bolt (34) is provided on the second clamping plate pull block (33); two ends of the first tension spring (4) are respectively hung on the first tension spring base pull bolt (12) and the first tension spring pull block pull bolt (24); and two ends of the second tension spring (5) are respectively hung on the second tension spring base pull bolt (13) and the second tension spring pull block pull bolt (34).

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