Multi-mode magnetic resonance bone microstructure high-resolution imaging detection equipment
By introducing adjustment, elevation, and hand-held mechanisms into the magnetic resonance imaging device, the problems of unstable bed height and lack of adaptability of the head coil have been solved, achieving high-precision bone microstructure imaging and improving patient usability.
Patent Information
- Application Number
- CN202511662631.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-13
- Publication Date
- 2026-01-02
AI Technical Summary
Existing magnetic resonance bone microstructure imaging equipment suffers from problems such as unstable bed height adjustment and lack of adaptability and protective design of the head coil, leading to inconvenience for patients and reduced detection accuracy.
A multimodal magnetic resonance bone microstructure high-resolution imaging detection device was designed, which adopts an adjustment mechanism, a height-raising mechanism and a handheld mechanism, including components such as a telescopic column, a hydraulic cylinder, a servo motor, a mesh bag and a sponge pad inside the head coil, to realize bed height adjustment, head stability and convenient patient getting on and off the bed.
It improves detection accuracy, reduces the physical burden on patients, and enhances the safety and convenience of use, especially for the care of patients with limited mobility.
Smart Images
Figure CN121242541A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of magnetic resonance equipment technology, specifically to a multimodal magnetic resonance bone microstructure high-resolution imaging detection device. Background Technology
[0002] Magnetic resonance imaging (MRI) technology has been widely used in the skeletal system, especially in the field of bone microstructure detection, due to its advantages such as no radiation, high soft tissue resolution, and multi-parameter imaging capabilities. It can clearly present detailed information such as the morphology of bone trabeculae and the distribution of bone density, providing key evidence for the early diagnosis and disease assessment of skeletal diseases such as osteoporosis and bone tumors. As the clinical requirements for the accuracy of bone microstructure detection continue to increase, multimodal magnetic resonance bone microstructure high-resolution imaging technology has gradually become a research and application hotspot. However, some related detection equipment on the market still has many problems that need to be improved, making it difficult to fully meet the clinical testing needs and patient experience. The design of the bed height adjustment mechanism of some existing equipment is unreasonable. Most equipment relies on a single hydraulic cylinder or a small number of support structures to achieve height adjustment, which has problems such as poor support stability and low adjustment accuracy. The initial height of the bed in some equipment is too high, and elderly patients with mobility difficulties or limb dysfunction need to get in and out of bed with the help of others, which increases the difficulty of nursing care. Furthermore, the head coil of existing equipment lacks adaptability and protective design. The head coil does not have a buffer and protective structure that conforms to the contour of the human ear. The noise generated by the magnetic resonance equipment during operation directly stimulates the patient's ear, which can easily cause discomfort such as tension and irritability. Especially for tests that require maintaining a fixed posture for a long time, ear discomfort will further increase the patient's physical burden and make it impossible to ensure the stability of the patient's head. Slight shaking is likely to occur during the test, resulting in blurred bone microstructure imaging areas and affecting the accuracy of the test. Therefore, it is necessary to design a multimodal magnetic resonance bone microstructure high-resolution imaging detection device to solve the above problems. Summary of the Invention
[0003] The purpose of this invention is to provide a high-resolution imaging detection device for multimodal magnetic resonance bone microstructures to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a multimodal magnetic resonance bone microstructure high-resolution imaging detection device, including a base, a magnetic resonance coil body fixedly connected to the top of the base, an adjustment mechanism provided on the right side of the base, a raising mechanism provided on the right side of the adjustment mechanism, and a handheld mechanism provided on the top of the adjustment mechanism; The adjustment mechanism includes a fixed base, which is fixedly connected to the bottom right side of the base. A telescopic column is fixedly connected to the top of the fixed base, and a support platform is fixedly connected to the top of the telescopic column. A first hydraulic cylinder is fixedly connected to the bottom of the support platform, and a guardrail is fixedly connected to the bottom of the support platform. A servo motor is fixedly connected to the right side of the support platform, and a threaded rod is fixedly connected to the left side of the servo motor. A movable seat is threadedly connected to the periphery of the threaded rod, and a bed is fixedly connected to the top of the movable seat. The bed is slidably connected to the inside of the magnetic resonance coil body and is located on the top of the support platform. A slider is fixedly connected to the bottom of the bed, and a head coil is fixedly connected to the top left side of the bed. A mesh bag is fixedly connected to the rear side of the head coil, an airbag is fixedly connected inside the mesh bag, and a sponge pad is fixedly connected to the front side of the mesh bag.
[0005] Preferably, the first hydraulic cylinder and the bottom of the guardrail are fixedly connected to the bottom of the fixed base, and the guardrail is located around the first hydraulic cylinder, so that the support platform and the bed can be adjusted in height by driving the first hydraulic cylinder.
[0006] Preferably, four sets of telescopic columns are provided and symmetrically distributed on the left and right sides of the bottom of the support platform, and two sets of the first hydraulic cylinder are provided and symmetrically distributed on the left and right sides of the bottom of the support platform. By providing two sets, the balance of the support platform during movement can be guaranteed.
[0007] Preferably, the threaded rod is rotatably connected to the inside of the support platform, the movable seat is slidably connected to the inside of the support platform, the bottom of the bed body is in contact with the top of the support platform, and the slider is slidably connected to the inside of the support platform, so as to facilitate the left and right movement of the bed body by the movable seat.
[0008] Preferably, the mesh bag, airbag, and sponge pad are provided in two sets and symmetrically distributed on the front and back sides inside the head coil, so that the patient's ear can be protected through the sponge pad.
[0009] Preferably, the elevation mechanism includes a mounting base, which is fixedly connected to the right side of the bed. A second hydraulic cylinder is fixedly connected to the right side of the mounting base, a connecting arm is fixedly connected to the left side of the second hydraulic cylinder, and a pad is fixedly connected to the left side of the connecting arm. The bottom of the pad is slidably connected to the bed and the mounting base.
[0010] Preferably, the connecting arm is slidably connected inside the mounting base, and the pad is located at the top of the bed, so that the steel pipe pad can elevate the patient's feet.
[0011] Preferably, the hand-held mechanism includes a slide rod, which is fixedly connected to the inside of the front surface of the bed. A connecting seat is slidably connected to the periphery of the slide rod, and the connecting seat is slidably connected to the inside of the bed. A handle is fixedly connected to the top of the connecting seat, and a pin is inserted into the inside of the right end of the connecting seat. The bottom of the pin is inserted into the top of the bed.
[0012] Preferably, the slide bar, connecting seat, handle and pin are provided in two sets and symmetrically distributed on the front and rear sides of the bed, so that the patient can remain stable while lying on the bed by providing two sets.
[0013] Compared with the prior art, the present invention provides a high-resolution imaging detection device for multimodal magnetic resonance bone microstructure, which has the following beneficial effects: This multimodal magnetic resonance bone microstructure high-resolution imaging device, through its adjustable mechanism, allows the patient to lie flat on the bed with their head inside the head coil when the magnetic resonance coil is in use. Initially, the bed is at its lowest height, facilitating easy patient placement. Four sets of symmetrical telescopic columns and two sets of symmetrical first hydraulic cylinders work together to support and stably adjust the height of the support platform, positioning the bed in the middle right side of the magnetic resonance coil. At this point, a servo motor drives a threaded rod to slide the moving seat against the bed, guided by a slider at the bottom of the bed, ensuring a smooth and precise placement of the patient inside the magnetic resonance coil, avoiding positional deviations caused by manual adjustment. Simultaneously, the fixed connection between the head coil and the bed, combined with the head coil... The stable positioning of the coil prevents slight head movement during the test, ensuring that the bone microstructure detection area remains within the coil's imaging range. This provides a stable positional basis for high-resolution imaging, improving the accuracy of the test results. Symmetrically arranged mesh bags, airbags, and sponge pads on both the front and back sides of the head coil allow for slight inflation adjustment to better fit different patients' ear contours, reducing noise from the coil's operation during MRI and effectively alleviating patient anxiety caused by ear discomfort. The sponge pads provide direct, flexible protection for the patient's ears. The protective railing around the first hydraulic cylinder effectively prevents collisions between the cylinder and external objects during operation, while also preventing accidental contact with moving parts by the patient, thus enhancing the safety of the equipment.
[0014] This multimodal magnetic resonance bone microstructure high-resolution imaging detection device features an elevation mechanism. When a patient is undergoing testing through the magnetic resonance coil and their feet need to be elevated, a second hydraulic cylinder drives a connecting arm to slide within the mounting base. This causes the connecting arm to slide the bottom of the platform, connecting it to the bed and mounting base. The platform's position on the top of the bed can be adjusted according to the patient's leg length, ensuring the patient's feet are positioned on the platform. This adapts to the physiological curves of different patients' legs, maintaining the optimal testing posture for areas such as lower limb bone microstructures. This reduces image blurring caused by improper posture, allowing the patient's legs to extend naturally and the body to be in a comfortable and relaxed position. It avoids leg soreness and poor blood circulation caused by prolonged lying down. It is particularly suitable for high-resolution bone microstructure imaging detection that requires maintaining a fixed posture for extended periods, significantly reducing the burden on the patient. When the platform is not in use, it can be positioned on the far right side of the bed top, without affecting the normal use of the bed.
[0015] This multimodal magnetic resonance bone microstructure high-resolution imaging device features a handheld mechanism. Through the cooperation of a slide bar, connecting seat, handle, and pin, the position of the handle can be flexibly adjusted. When getting in and out of bed, patients can adjust the handle to a suitable position by sliding the connecting seat and holding the handle to assist in getting up or lying down, improving mobility. During the examination, the pin can fix the position of the handle, allowing patients to lightly grip the handle to maintain body stability. It is especially suitable for patients with limited mobility or the elderly, reducing the assistance pressure on caregivers. The slide bar, connecting seat, handle, and pin are provided in two sets and symmetrically distributed on the front and back sides of the bed to ensure balance and stability during use. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the rear view structure of the present invention; Figure 3 This is a schematic diagram of the adjustment mechanism. Figure 4 This is a schematic diagram of the top structure of the mounting base; Figure 5 This is a schematic diagram of the top structure of the support platform; Figure 6 This is a schematic diagram of the top structure of the bed. Figure 7 This is a schematic diagram of the heightening mechanism; Figure 8This is a schematic diagram of the handheld mechanism.
[0017] In the diagram: 1. Base; 2. Magnetic resonance coil body; 3. Adjustment mechanism; 4. Elevation mechanism; 5. Handheld mechanism; 31. Fixed seat; 32. Telescopic column; 33. Support platform; 34. Guardrail; 35. Bed frame; 36. First hydraulic cylinder; 37. Servo motor; 38. Threaded rod; 39. Moving seat; 391. Slider; 392. Head coil; 393. Mesh bag; 394. Airbag; 395. Sponge pad; 41. Mounting seat; 42. Second hydraulic cylinder; 43. Connecting arm; 44. Pad; 51. Slide rod; 52. Connecting seat; 53. Handle; 54. Pin. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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 invention according to the specific circumstances. Example
[0020] Please see Figure 1-8 The present invention provides a technical solution: a multimodal magnetic resonance bone microstructure high-resolution imaging detection device, including a base 1, a magnetic resonance coil body 2 fixedly connected to the top of the base 1, an adjustment mechanism 3 on the right side of the base 1, a raising mechanism 4 on the right side of the adjustment mechanism 3, and a handheld mechanism 5 on the top of the adjustment mechanism 3. The adjustment mechanism 3 includes a fixed base 31, which is fixedly connected to the bottom right side of the base 1. A telescopic column 32 is fixedly connected to the top of the fixed base 31. A support platform 33 is fixedly connected to the top of the telescopic column 32. A first hydraulic cylinder 36 is fixedly connected to the bottom of the support platform 33. A guardrail 34 is fixedly connected to the bottom of the support platform 33. A servo motor 37 is fixedly connected to the right side of the support platform 33. A threaded rod 38 is fixedly connected to the left side of the servo motor 37. A movable base 39 is threadedly connected to the outer periphery of the threaded rod 38. A bed 35 is fixedly connected to the top of the movable base 39. The bed 35 is slidably connected to the inside of the magnetic resonance coil body 2. The bed 35 is set on the top of the support platform 33. A slider 391 is fixedly connected to the bottom of the bed 35. A head coil 392 is fixedly connected to the top left side of the bed 35. A mesh bag 393 is fixedly connected to the rear side of the head coil 392. An airbag 394 is fixedly connected inside the mesh bag 393. A sponge pad 395 is fixedly connected to the front side of the mesh bag 393.
[0021] The bottom of the first hydraulic cylinder 36 and the guardrail 34 are respectively fixedly connected to the bottom of the fixed base 31, and the guardrail 34 is located outside the first hydraulic cylinder 36, so that the support platform 33 and the bed 35 can be adjusted in height by driving the first hydraulic cylinder 36.
[0022] Four sets of telescopic columns 32 are provided and symmetrically distributed on the left and right sides of the bottom of the support platform 33. Two sets of first hydraulic cylinders 36 are provided and symmetrically distributed on the left and right sides of the bottom of the support platform 33. By setting two sets, the balance of the support platform 33 when it moves can be guaranteed.
[0023] The threaded rod 38 is rotatably connected to the inside of the support platform 33, the movable seat 39 is slidably connected to the inside of the support platform 33, the bottom of the bed 35 is in contact with the top of the support platform 33, and the slider 391 is slidably connected to the inside of the support platform 33, so that the bed 35 can be moved left and right by the movable seat 39.
[0024] Two sets of mesh bags 393, airbags 394, and sponge pads 395 are provided and symmetrically distributed on the front and back sides of the head coil 392, so that the patient's ears can be protected through the sponge pads 395. Example
[0025] Please see Figure 1-8 Furthermore, based on Embodiment 1, the elevation mechanism 4 includes a mounting base 41, which is fixedly connected to the right side of the bed 35. A second hydraulic cylinder 42 is fixedly connected to the right side of the mounting base 41, and a connecting arm 43 is fixedly connected to the left side of the second hydraulic cylinder 42. A pad 44 is fixedly connected to the left side of the connecting arm 43, and the bottom of the pad 44 is slidably connected to the inside of the bed 35 and the mounting base 41.
[0026] The connecting arm 43 is slidably connected inside the mounting base 41, and the pad 44 is located on top of the bed 35, so that the steel pipe pad 44 can elevate the patient's feet. Example
[0027] Please see Figure 1-8 Based on Examples 1 and 2, the handheld mechanism 5 further includes a slide bar 51, which is fixedly connected to the inside of the front surface of the bed 35. A connecting seat 52 is slidably connected to the outside of the slide bar 51. The connecting seat 52 is slidably connected to the inside of the bed 35. A handle 53 is fixedly connected to the top of the connecting seat 52. A pin 54 is inserted into the inside of the right end of the connecting seat 52. The bottom of the pin 54 is inserted into the top of the bed 35.
[0028] Two sets of slide rods 51, connecting seats 52, handles 53 and pins 54 are provided and symmetrically distributed on the front and rear sides of the bed 35, so that the patient can remain stable when lying on the bed 35 by setting two sets.
[0029] In actual operation, when this device is used, when the magnetic resonance coil body 2 is in use, the patient first lies flat on the bed 35 with the head inside the head coil 392. In the initial state, the bed 35 is at the lowest height, which makes it easy for the patient to lie flat on the bed 35. When it is necessary to elevate the feet, the second hydraulic cylinder 42 drives the connecting arm 43 to slide inside the mounting base 41, so that the connecting arm 43 drives the bottom of the pad 44 to slide and connect to the bed 35 and the mounting base 41. According to the length of the patient's legs, the left and right positions of the pad 44 at the top of the bed 35 are changed. The patient's feet are positioned on the platform 44, which adapts to the physiological curves of different patients' legs, ensuring that the detection area, such as the microstructure of the lower limb bones, maintains the optimal detection posture, reducing imaging blur caused by improper posture, allowing the patient's legs to extend naturally and the body to be in a comfortable and relaxed posture, avoiding problems such as leg soreness and poor blood circulation caused by prolonged lying flat. It is especially suitable for high-resolution imaging detection of bone microstructures that require maintaining a fixed posture for a long time, greatly reducing the physical burden on the patient. When the platform 44 is not in use, it can be placed on the far right side of the top of the bed 35 without affecting the normal use of the bed 35. The fixed connection between the head coil 392 and the bed 35, combined with the stable positioning of the head coil 392, can prevent slight shaking of the patient's head during the test, ensuring that the bone microstructure detection area is always within the coil imaging range, providing a stable positional basis for high-resolution imaging, and improving the accuracy of the test results. The head coil 392 is symmetrically arranged with mesh bags 393, air bags 394 and sponge pads 395 on the front and back sides. The air bags 394 can be adjusted by slight inflation to further adapt to the ear contours of different patients, reduce the noise generated by the coil operation during magnetic resonance testing, and effectively alleviate the tension caused by ear discomfort. The sponge pads 395 can directly form flexible protection for the patient's ears. At this time, the first hydraulic cylinder 36 drives the support platform 33 and the bed 35 to adjust the height. The four sets of symmetrical telescopic columns 32 and the two sets of symmetrical first hydraulic cylinders 36 can work together to support and stably adjust the height of the support platform 33, so that the bed 35 is located in the middle right side of the magnetic resonance coil body 2. After the height adjustment is completed, the servo motor 37 drives the threaded rod 38 to drive the moving seat 39 to slide with the bed 35. With the guidance of the slider 391 at the bottom of the bed 35, the patient can be smoothly and accurately sent into the magnetic resonance coil body 2, avoiding positional deviation caused by manual adjustment. At this time, the patient can be tested. Through the cooperation of the slide bar 51, connecting seat 52, handle 53 and pin 54, the position of handle 53 can be flexibly adjusted. When the patient gets on or off the bed, the handle 53 can be adjusted to a suitable position by sliding the connecting seat 52. The patient can hold the handle 53 to assist in getting up or lying down, improving the convenience of movement. During the test, the pin 54 can fix the position of handle 53. The patient can hold the handle 53 lightly to maintain body stability. It is especially suitable for patients with limited mobility or elderly patients, reducing the assistance pressure on nursing staff. There are two sets of slide bar 51, connecting seat 52, handle 53 and pin 54, which are symmetrically distributed on the front and rear sides of the bed 35 to ensure balance and stability during use. The magnetic resonance coil body 2 used in this case is a Siemens MAGNETOM Terra.X, which can realize high-resolution imaging detection of multimodal bone microstructures. When using it, all the first hydraulic cylinders 36, the second hydraulic cylinders 42 and the servo motors 37 need to be connected to the same PLC controller near the equipment to ensure the coordinated and automated operation of the equipment. The PLC controller is existing technology and its operation method is well known to those skilled in the art, so it will not be described in detail in this case.
[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. A multimodal magnetic resonance bone microstructure high-resolution imaging detection device, comprising a base (1), characterized in that: The base (1) is fixedly connected to the top of the magnetic resonance coil body (2), the base (1) is provided with an adjustment mechanism (3) on the right side, the adjustment mechanism (3) is provided with a raising mechanism (4) on the right side, and the adjustment mechanism (3) is provided with a hand-held mechanism (5) on the top. The adjustment mechanism (3) includes a fixed seat (31), which is fixedly connected to the bottom right side of the base (1). A telescopic column (32) is fixedly connected to the top of the fixed seat (31). A support platform (33) is fixedly connected to the top of the telescopic column (32). A first hydraulic cylinder (36) is fixedly connected to the bottom of the support platform (33). A guardrail (34) is fixedly connected to the bottom of the support platform (33). A servo motor (37) is fixedly connected to the right side of the support platform (33). A threaded rod (38) is fixedly connected to the left side of the servo motor (37). A movable seat (39) is threadedly connected to the outer periphery of the threaded rod (38). The top of the movable seat (39) is fixedly connected to the bed body (35), the bed body (35) is slidably connected to the inside of the magnetic resonance coil body (2), the bed body (35) is set on the top of the support platform (33), the bottom of the bed body (35) is fixedly connected to the slider (391), the top left side of the bed body (35) is fixedly connected to the head coil (392), the rear side of the head coil (392) is fixedly connected to the mesh bag (393), the inside of the mesh bag (393) is fixedly connected to the airbag (394), and the front side of the mesh bag (393) is fixedly connected to the sponge pad (395).
2. The multimodal magnetic resonance bone microstructure high-resolution imaging detection device according to claim 1, characterized in that: The bottom of the first hydraulic cylinder (36) and the guardrail (34) are respectively fixedly connected to the bottom of the fixed base (31), and the guardrail (34) is located around the first hydraulic cylinder (36).
3. The multimodal magnetic resonance bone microstructure high-resolution imaging detection device according to claim 1, characterized in that: The telescopic columns (32) are provided in four sets and are symmetrically distributed on the left and right sides of the bottom of the support platform (33). The first hydraulic cylinder (36) is provided in two sets and is symmetrically distributed on the left and right sides of the bottom of the support platform (33).
4. The multimodal magnetic resonance bone microstructure high-resolution imaging detection device according to claim 1, characterized in that: The threaded rod (38) is rotatably connected to the inside of the support platform (33), the movable seat (39) is slidably connected to the inside of the support platform (33), the bottom of the bed (35) is in contact with the top of the support platform (33), and the slider (391) is slidably connected to the inside of the support platform (33).
5. The multimodal magnetic resonance bone microstructure high-resolution imaging detection device according to claim 1, characterized in that: The mesh bag (393), airbag (394) and sponge pad (395) are provided in two sets and are symmetrically distributed on the front and back sides of the head coil (392).
6. The multimodal magnetic resonance bone microstructure high-resolution imaging detection device according to claim 1, characterized in that: The elevation mechanism (4) includes a mounting base (41), which is fixedly connected to the right side of the bed (35). A second hydraulic cylinder (42) is fixedly connected to the right side of the mounting base (41), and a connecting arm (43) is fixedly connected to the left side of the second hydraulic cylinder (42). A pad (44) is fixedly connected to the left side of the connecting arm (43), and the bottom of the pad (44) is slidably connected to the inside of the bed (35) and the mounting base (41).
7. The multimodal magnetic resonance bone microstructure high-resolution imaging detection device according to claim 6, characterized in that: The connecting arm (43) is slidably connected inside the mounting base (41), and the pad (44) is located on top of the bed body (35).
8. The multimodal magnetic resonance bone microstructure high-resolution imaging detection device according to claim 1, characterized in that: The handheld mechanism (5) includes a slide rod (51), which is fixedly connected to the inside of the front surface of the bed (35). A connecting seat (52) is slidably connected to the outside of the slide rod (51). The connecting seat (52) is slidably connected to the inside of the bed (35). A handle (53) is fixedly connected to the top of the connecting seat (52). A pin (54) is inserted into the inside of the right end of the connecting seat (52). The bottom of the pin (54) is inserted into the top of the bed (35).
9. The multimodal magnetic resonance bone microstructure high-resolution imaging detection device according to claim 8, characterized in that: The slide bar (51), connecting seat (52), handle (53) and pin (54) are provided in two sets and are symmetrically distributed on the front and rear sides of the bed body (35).