A CT scanning bed mechanical mechanism with low-position assisting and position-limiting integration
By combining a shear support arm and an assist limit mechanism in the CT scanning bed, and utilizing the energy storage principle of elastic elements to provide low-position assistance and switch limits, the problems of high load on the drive system at low positions and easy damage to mechanical limits are solved. This achieves the integration of low-position assistance and limit, reduces costs and space occupation, and improves safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING PHOTON COUNTING TECHNOLOGY LTD
- Filing Date
- 2025-04-17
- Publication Date
- 2026-06-26
Smart Images
Figure CN224403668U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of CT scanning bed lifting assistance technology, specifically a CT scanning bed mechanical mechanism with integrated low-position assistance and limiting. Background Technology
[0002] Clinical diagnostics requires scanning beds to have the lowest possible height and the highest possible load capacity to seamlessly connect with patient transport beds. Lifting high loads and maintaining a low bed height necessitates a high-capacity drive system, which presents challenges in terms of cost and spatial layout; simultaneously, it is essential to ensure mechanical restraint capabilities under failure modes.
[0003] Chinese Patent Publication No. CN217447816U discloses a "Scanning Bed Lifting Device and Scanning Bed". This patent is a parallelogram lifting bed structure that uses gas springs or hydraulic cylinders to provide assistance.
[0004] There are two main types of existing structures:
[0005] One method is to use a large-size drive motor for direct drive of the bed;
[0006] Secondly, power-assisted mechanisms such as power springs, gas springs, or hydraulic cylinders are used. Compared to power springs, other types have problems such as complex structure, high cost, and inability to integrate vertical mechanical limit structures.
[0007] The horizontal axial force at the lower position of the scissor arm structure is approximately 5.7 times that of the vertical load (see...). Figure 5 This means that it has the effect of amplifying the load. The large load puts a great burden on the horizontal motor that drives the lifting and lowering. In the case of system failure, it will cause a great impact on the horizontal mechanical limit block fixed to the bed base, and may even cause cracking. Moreover, clinical requirements require the scanning bed to have a minimum height of 450mm, which takes up little space and is conducive to connecting with the patient transfer bed.
[0008] Combining the above two points, it is particularly important to improve the space utilization of the bed base and the safety of mechanical limiters.
[0009] Therefore, a CT scanning bed mechanical mechanism with integrated low-position assist and limit is provided, which combines the assist and limit devices to ensure the reliability of its timing in terms of mechanical structure and save space and cost. Utility Model Content
[0010] The purpose of this invention is to provide a CT scanning bed mechanical mechanism with integrated low-position assistance and limiting, so as to solve the problems mentioned in the background art.
[0011] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a CT scanning bed mechanical mechanism with low-position assistance and limit integration, including a fixed base and a scanning bed body, wherein a shear support arm and a power device are installed on the top of the fixed base, one end of the shear support arm is driven by the power device, and the top of the shear support arm is hinged to the bottom of the scanning bed body.
[0012] The top of the fixed base is also equipped with an assist limiting mechanism, which is located between the shear support arms.
[0013] The assist limiting mechanism includes a connecting base fixed to the top of the fixed base, a supporting outer tube fixedly connected to the top of the connecting base, a retractable sliding inner tube inserted inside the supporting outer tube, and an elastic element sleeved on the outer surface of the supporting outer tube to apply upward pressure to the sliding inner tube.
[0014] Preferably, the power unit is horizontally mounted on top of the fixed base and applies horizontal power, and the power unit pulls the bottom of the movable inclined member of the shear support arm to move laterally.
[0015] Preferably, the assist limiting mechanism is installed between the inclined pull members at the non-lateral end of the shear support arm, and the number of the assist limiting mechanisms is one or more.
[0016] Preferably, the shear support arm consists of two centrally hinged diagonal members, one of which has its bottom side movable laterally above the top of the fixed base.
[0017] Preferably, the bottom of the sliding inner tube is positioned relative to the inner top of the supporting outer tube, and a support is provided at the top of the sliding inner tube.
[0018] Preferably, the support is a rigid cylinder, and the diameter of the rigid cylinder is equal to the diameter of the outer support tube.
[0019] Preferably, the elastic element is a sheet-like spiral elastic metal strip, and there are multiple sheet-like spiral metal strips.
[0020] Compared with the prior art, the beneficial effects achieved by this utility model are:
[0021] First, this utility model uses a power device to horizontally drive the shear support arm. During the lifting process, different heights correspond to different horizontal axial forces. In the nonlinear relationship, the horizontal axial force at the lower position is approximately 5.7 times the load.
[0022] Based on this characteristic, in order to reduce the horizontal axial force driven by the scissor arm mechanism, the energy storage principle of the elastic element is used to realize the low-position assistance function of the scissor support arm. When the scissor support arm is in a low position, the elastic element is compressed to store energy. When the scissor support arm is raised, the elastic element extends to release energy, which can avoid the problem of overload caused by the force on the motor alone.
[0023] Secondly, this utility model installs an elastic element on the outer surface of the supporting outer tube, while the elastic element extends and retracts; the upper sliding inner tube is sleeved in the side hole of the supporting outer tube. When the elastic element is compressed to the lowest position, the sliding inner tube contacts the upper side of the supporting outer tube along with the elastic element. The horizontal limiting block fixed to the fixed base is replaced with a vertical sliding inner tube, avoiding the impact of a 5.7-fold horizontal expansion, and achieving a safe and reliable mechanical protection function.
[0024] Third, this utility model has the following advantages by integrating the assist limit mechanism: effectively reducing the burden on the drive motor; avoiding the problem of cracking or damaging the mechanical limit block in the state of system malfunction; and saving installation space and manufacturing costs overall. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of this utility model;
[0026] Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;
[0027] Figure 3 This is a schematic diagram of the free state of the assist limit mechanism of this utility model;
[0028] Figure 4 This is a schematic diagram of the pressure state of the assist limit mechanism of this utility model;
[0029] Figure 5 This is a schematic diagram of the scissor arm principle.
[0030] Figure 6 This is a schematic diagram of the horizontal force curve of the scanning bed of this utility model.
[0031] The components include: 1. Fixed base; 2. Shear support arm; 3. Power unit; 4. Scanning bed body; 5. Assisted limiting mechanism; 501. Connecting base; 502. Supporting outer tube; 503. Sliding inner tube; 504. Elastic element. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] Please see Figure 1-6 A CT scanning bed mechanical mechanism with integrated low-position assist and limit, including a fixed base 1 and a scanning bed body 4. A shear support arm 2 and a power unit 3 are installed on the top of the fixed base 1. One end of the shear support arm 2 is driven by the power unit 3. The top of the shear support arm 2 is hinged to the bottom of the scanning bed body 4.
[0034] The top of the fixed base 1 is also equipped with an assist limit mechanism 5, which is located between the shear support arms 2. When the scanning bed body 4 is in a low position, it provides a downward limit and an upward assist to the shear support arms 2.
[0035] The assist limiting mechanism 5 includes a connecting base 501 fixed to the top of the fixed base 1. A supporting outer tube 502 is fixedly connected to the top of the connecting base 501. A retractable sliding inner tube 503 is inserted into the inside of the supporting outer tube 502. An elastic element 504 is sleeved on the outer surface of the supporting outer tube 502 to apply upward pressure to the sliding inner tube 503.
[0036] like Figure 5 As shown, the relationship between the horizontal axial force F of the scissor arm and the vertical load Q, F=Q*cot(θ), shows that different heights during the lifting process correspond to different horizontal axial forces. In the nonlinear relationship, the horizontal axial force at the lower position is approximately 5.7 times the load.
[0037] Based on this characteristic, in order to reduce the horizontal axial force driven by the scissor arm mechanism, the energy storage principle of the elastic element 504 is used to realize the low-position assist function of the shear support arm 2. When the shear support arm 2 is in a low position, the elastic element 504 is compressed to store energy. When the shear support arm 2 is raised, the elastic element 504 extends to release energy, which can avoid the problem of overload caused by the force on the motor alone.
[0038] By installing the elastic element 504 on the outer surface of the supporting outer tube 502, and simultaneously extending and retracting the elastic element 504, the upper sliding inner tube 503 is fitted into the side hole of the supporting outer tube 502. When the elastic element 504 is compressed to the lowest position, the sliding inner tube 503 contacts the upper side of the supporting outer tube 502 along with the elastic element 504. The horizontal limiting block fixed to the fixed base 1 is replaced with the vertical sliding inner tube 503, avoiding the impact of a 5.7-fold horizontal expansion, and achieving a safe and reliable mechanical protection function.
[0039] The integrated power-assisted limit mechanism 5 has the following advantages: it effectively reduces the burden on the drive motor; it avoids the problem of the mechanical limit block being cracked or damaged in the event of system malfunction; and it saves installation space and manufacturing costs overall.
[0040] like Figure 6 As shown, the assist limit mechanism 5 is installed on the force-bearing end of the fixed side shear support arm 2. Theoretically, it is necessary to balance about 0.5 times the load force at the low position to make the horizontal axial force curve of the shear support arm 2 continuous and smooth, so as to achieve continuous force during the lifting process and avoid the scanning bed shaking, which may cause panic or discomfort to the patient.
[0041] Specifically, the power unit 3 is horizontally installed on the top of the fixed base 1 and applies horizontal power, and the power unit 3 pulls the bottom of the movable inclined member of the shear support arm 2 to move laterally.
[0042] Through the above technical solution, the traction shear support arm 2 is similar in shape to scissors, such as... Figure 1 As shown, the movable inclined pull member in the traction shear support arm 2 is part of the scissor shape. The bottom of the inclined pull member in the shear support arm 2 is slidably connected to the top of the fixed base 1, and its top is movably connected to the bottom of the scanning bed 4, as shown. Figure 1 As shown, there are two traction shear support arms 2, symmetrically distributed on the top of the fixed base 1. Two diagonal braces are provided in each traction shear support arm 2; the sliding diagonal braces are the laterally movable diagonal braces mentioned in the text, specifically located at... Figure 1 The two diagonal braces on the front and back, such as Figure 1 and Figure 2 As shown, one side of the power unit 3 is connected to one of the transversely movable diagonal bracing members of the shear support arm 2, as follows: Figure 1 and Figure 2 As shown, the side of the power unit 3 away from the fixed base 1 is connected to a diagonal tie member of the shear support arm 2 that can move laterally. Under this condition, the bottom of the diagonal tie member is driven to move laterally, i.e. slide, on the fixed base 1, so that the power unit 3 is installed horizontally. Thus, when the power unit 3 applies pressure to the diagonal tie member in the shear support arm 2, because the force applied by the power unit 3 is in the horizontal direction and perpendicular to the force applied by the scanning bed body 4, the force directions are avoided from overlapping, thus effectively protecting the power unit 3.
[0043] Specifically, the assist limit mechanism 5 is installed between the inclined pull members at the non-lateral end of the shear support arm 2, and the number of assist limit mechanisms 5 can be one or more.
[0044] Through the above technical solution, the assisting limit mechanism 5 is installed between the inclined pull members at the non-lateral end of the shear support arm 2, so that the assisting limit mechanism 5 will not block the power unit 3 from applying power to the shear support arm 2. The number of assisting limit mechanisms 5 can be adjusted according to the needs of the site. The more assisting limit mechanisms 5 there are, the stronger the compressive force will be when under pressure.
[0045] Specifically, the shear support arm 2 consists of two inclined tie members that are centrally hinged. The bottom of one of the inclined tie members of the shear support arm 2 can move laterally on the top of the fixed base 1.
[0046] Through the above technical solution, the shear support arm 2 composed of two inclined tie members can change the height of the top of the shear support arm 2 when it is subjected to power on one side, so as to realize the lifting and lowering function, and can improve the stability of the support by changing the direction of the force.
[0047] Specifically, the bottom of the sliding inner tube 503 is limited to the inner top of the supporting outer tube 502, and a support is provided at the top of the sliding inner tube 503.
[0048] The above technical solution can effectively prevent the sliding inner tube 503 from detaching from the support outer tube 502. The top of the sliding inner tube 503 is provided with a support to increase the contact area of the support limit, thereby improving stability.
[0049] Specifically, the support is a rigid cylinder, and the diameter of the rigid cylinder is equal to the diameter of the outer support tube 502.
[0050] By using the above technical solution, the support is set as a rigid cylinder, which can improve the service life when limiting and assisting, and the diameter of the rigid cylinder is used to limit the elastic element 504.
[0051] Specifically, the elastic element 504 is a sheet-like spiral elastic metal strip, and there are multiple sheet-like spiral metal strips.
[0052] Through the above technical solution, the elastic element 504 is set as a sheet-like spiral elastic metal strip, which has better compressibility than a cylindrical spring, and multiple sheet-like spiral elastic metal strips are set to improve the lifting assistance performance of the shear support arm 2.
[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A CT scanning bed mechanical mechanism with integrated low-position assist and limiting, comprising a fixed base (1) and a scanning bed body (4), characterized in that: The top of the fixed base (1) is equipped with a shear support arm (2) and a power device (3). One end of the shear support arm (2) is driven by the power device (3). The top of the shear support arm (2) is hinged to the bottom of the scanning bed body (4). The top of the fixed base (1) is also equipped with an assist limiting mechanism (5), which is located between the shear support arms (2); The assist limiting mechanism (5) includes a connecting base (501) fixed to the top of the fixed base (1). A supporting outer tube (502) is fixedly connected to the top of the connecting base (501). A retractable sliding inner tube (503) is inserted into the inside of the supporting outer tube (502). An elastic element (504) is sleeved on the outer surface of the supporting outer tube (502) to apply upward pressure to the sliding inner tube (503).
2. The CT scanning bed mechanical mechanism with integrated low-position assist and limiting as described in claim 1, characterized in that: The power unit (3) is horizontally mounted on the top of the fixed base (1) and applies horizontal power. The power unit (3) pulls the bottom of the movable inclined member of the shear support arm (2) to move laterally.
3. The CT scanning bed mechanical mechanism with integrated low-position assist and limiting as described in claim 1, characterized in that: The assist limiting mechanism (5) is installed between the inclined pull member at the non-lateral end of the shear support arm (2), and the number of the assist limiting mechanism (5) is one or more.
4. The CT scanning bed mechanical mechanism with integrated low-position assist and limiting as described in claim 1, characterized in that: The shear support arm (2) consists of two inclined members that are centrally hinged. The bottom of one of the inclined members of the shear support arm (2) can move laterally on the top of the fixed base (1).
5. The CT scanning bed mechanical mechanism with integrated low-position assist and limiting as described in claim 3, characterized in that: The bottom of the sliding inner tube (503) is limited to the inner top of the supporting outer tube (502), and a support is provided at the top of the sliding inner tube (503).
6. The CT scanning bed mechanical mechanism with integrated low-position assist and limiting as described in claim 5, characterized in that: The support is a rigid cylinder, and the diameter of the rigid cylinder is equal to the diameter of the outer support tube (502).
7. The CT scanning bed mechanical mechanism with integrated low-position assist and limiting as described in claim 1, characterized in that: The elastic element (504) is a sheet-like spiral elastic metal strip, and there are multiple sheet-like spiral metal strips.