Large-caliber CT scanning device

Abstract

The invention discloses a large-caliber CT scanning device and relates to the technical field of CT scanning, the large-caliber CT scanning device comprises a supporting frame, a fixed support and a rotating support, the fixed support is installed on the supporting frame, the rotating support is rotatably arranged in the fixed support, a scanning hole is formed in the rotating support, and a rotating frame is arranged on the rotating support; the rotating frame comprises a connecting plate, an upper plate, a lower plate and two side plates. According to the large-caliber CT scanning device, the rotating frame of a similar trapezoidal structure is utilized, the distances from the X-ray tube, the cooling system, the high-voltage box and the control machine box to the circle center of the scanning hole are smaller, centrifugal force borne by parts is reduced, and therefore the operation stability of the large-caliber CT scanning device is improved.

Description

Technical Field

[0001] This application relates to the technical field of CT scanning, and particularly to a large-aperture CT scanning device. Background Art

[0002] CT is a medical device that uses synchronous rotation of X-rays and detectors to perform tomographic imaging on the human body. Its core components include an X-ray tube, a detector array, a rotating gantry, a data processing system, etc. It reconstructs high-resolution cross-sectional or three-dimensional images through a computer and is widely used in disease diagnosis, trauma assessment, and tumor detection.

[0003] Currently, a CT scanning gantry includes a support frame, a fixed bracket, and a rotating bracket. The fixed bracket is installed on the support frame, and the rotating bracket is rotatably installed in the fixed bracket through bearings. A driving mechanism is installed on the fixed bracket, and the driving mechanism drives the rotating bracket to rotate. Components such as an X-ray tube, a detector, a cooling system, a high-voltage box, a control chassis, and a counterweight are all installed on the circular rotating bracket. The multiple components are installed at intervals along the circumferential side of the rotating bracket, so that the center of gravity of the rotating bracket is located at the center of the rotating bracket. A scanning hole is formed in the rotating bracket, and the diameter of the scanning hole usually ranges from 500 to 700 mm. After the scanning bed sends the patient into the scanning hole, the driving mechanism drives the multiple components to rotate through the rotating bracket, thereby performing CT scanning.

[0004] When performing CT scanning on obese patients, a scanning hole with a conventional aperture may cause the patient's body to exceed the scanning field of view, affecting the integrity of the imaging, or even preventing the patient from entering the scanning hole. Therefore, obese patients need to be scanned using a large-aperture CT scanning device. When the inner diameter of the scanning hole increases, in order to adapt to the installation of each component, the outer diameter of the rotating bracket will inevitably increase, thereby increasing the distance from each component to the center of the scanning hole, and increasing the centrifugal force received by the components during rotation. Excessive centrifugal force will exacerbate the vibration caused by the center-of-gravity offset of the components, thereby reducing the stability of the CT scanning device. Summary of the Invention

[0005] In order to improve the stability of the operation of a large-aperture CT scanning device, this application provides a large-aperture CT scanning device.

[0006] The large-aperture CT scanning device provided by this application adopts the following technical solutions: A large-bore CT scanning device, comprising a support frame, a fixed bracket and a rotating bracket. The fixed bracket is mounted on the support frame, the rotating bracket is rotatably arranged within the fixed bracket, a scanning hole is formed within the rotating bracket, the aperture of the scanning hole is 800 - 850 mm, a driving mechanism for driving the rotating bracket to rotate is arranged within the fixed bracket, a rotating frame is fixedly arranged on the rotating bracket, the rotating frame comprises a connecting plate, an upper plate, a lower plate and two side plates. The connecting plate is fixedly arranged on the side wall of the rotating bracket, the upper plate is fixedly arranged on the connecting plate, an X-ray tube is arranged on one side of the upper plate away from the scanning hole, a pre-collimator is arranged on one side of the upper plate close to the scanning hole, the lower plate is parallel to the upper plate and fixedly arranged on the connecting plate, a counterweight is arranged on the lower plate, the upper plate and the lower plate are respectively located on two sides in the diameter direction of the scanning hole, the length of the lower plate is greater than that of the upper plate, a detector is arranged on the connecting plate on one side of the scanning hole close to the lower plate, the two side plates are fixedly arranged on the connecting plate and located on two sides of the scanning hole, two ends of the side plates are fixedly connected to the same side of the upper plate and the lower plate, and a cooling system, a high-voltage box and a control chassis are arranged on the side walls of the two side plates away from the scanning hole.

[0007] By adopting the above technical solution, the aperture of the scanning hole is 800 - 850 mm, which is convenient for obese patients to perform CT scans. The driving mechanism drives the rotating bracket to rotate, and the rotating bracket drives each component to rotate through the rotating frame, so as to perform CT scans on patients. The rotating frame is a structure similar to a trapezoid, making the distances from the X-ray tube, the cooling system, the high-voltage box and the control chassis to the center of the scanning hole smaller, reducing the centrifugal force received by the components, and thus improving the operating stability of the large-bore CT scanning device.

[0008] Preferably, both of the two side plates are arranged along the tangent direction of the scanning hole.

[0009] By adopting the above technical solution, both of the two side plates are arranged along the tangent direction of the scanning hole, making the distances from the side plates, the upper plate and the lower plate to the center of the scanning hole smaller, and being able to further reduce the distances from each component to the center of the scanning hole, and thus further reducing the centrifugal force received by the components.

[0010] Preferably, the lower plate comprises a first plate body and two second plate bodies. The first plate body and the two second plate bodies are both fixedly connected to the connecting plate. The first plate body is parallel to the upper plate, the two second plate bodies are fixedly arranged at both ends in the length direction of the first plate body, the two second plate bodies incline towards the upper plate, and the end parts of the two second plate bodies away from the first plate body are respectively fixedly connected to the end parts of the two side plates away from the upper plate.

[0011] By adopting the above technical solution, the second plate body inclines towards the upper plate, facilitating the installation of the detector. Meanwhile, the distance from both sides of the lower plate to the circle of the scanning hole is reduced, and the centrifugal force received when the rotating frame rotates is decreased.

[0012] Preferably, the driving mechanism includes a driving member, a driving wheel, and a driving belt. The driving member is fixedly arranged on the fixed bracket. The driving wheel is arranged at the driving end of the driving member. The driving belt is sleeved on the driving wheel and the rotating bracket. A tensioning mechanism for tensioning the driving belt is arranged on the fixed bracket.

[0013] By adopting the above technical solution, the tensioning mechanism tensions the driving belt. The driving member drives the driving wheel to rotate, and the driving wheel drives the rotating bracket to rotate through the driving belt, thereby driving each component on the rotating frame to rotate.

[0014] Preferably, the tensioning mechanism includes a tensioner, a first tensioning wheel, and two second tensioning wheels. The tensioner is fixedly arranged on the fixed bracket. The first tensioning wheel is rotatably arranged at the driving end of the tensioner. The two second tensioning wheels are both rotatably installed on the fixed bracket and located at the upper and lower ends of the driving belt, and the first tensioning wheel and the second tensioning wheels are both in contact with the outer side wall of the driving belt.

[0015] By adopting the above technical solution, the tensioner drives the first tensioning wheel to move towards the driving belt. The first tensioning wheel and the two second tensioning wheels tension the driving belt, making the driving belt not prone to slipping, and thus improving the driving effect of the driving mechanism.

[0016] Preferably, a ray port is formed in the upper plate. A first mounting plate and a second mounting plate are detachably and fixedly arranged in a stacked manner above the ray port on the upper plate. The second mounting plate is located above the first mounting plate. The X-ray tube is detachably and fixedly arranged on the second mounting plate through a support. Pulling plates are arranged on both adjacent side walls of the upper plate. A tensioning member is arranged in the pulling plate. The two tensioning members are respectively connected to the first mounting plate and the second mounting plate. An installation frame is detachably and fixedly arranged below the ray port on the upper plate. The front collimator is detachably and fixedly arranged in the installation frame.

[0017] By adopting the above technical solution, the rays emitted by the X-ray tube are shot onto the front collimator through the ray port. Two tensioning members cooperate with two pulling plates to tension and reinforce the first mounting plate and the second mounting plate and firmly mount the first mounting plate and the second mounting plate on the upper plate, making the X-ray tube more firmly installed. Meanwhile, the front collimator is installed on the upper plate through the installation frame, making the front collimator more firmly installed.

[0018] Preferably, a reinforcing block is fixedly arranged on the inner side wall of the ray port of the upper plate. A limiting rod is slidably inserted into the mounting frame. A limiting block is arranged at the bottom end of the limiting rod, and the limiting block abuts against the bottom wall of the mounting frame. A connecting block is fixedly arranged on the side wall of the bracket. The limiting rod slidably passes through the reinforcing block, the first mounting plate, the second mounting plate and the connecting block. A limiting pin is slidably arranged in the connecting block. A limiting groove is formed at the top of the limiting rod, and the limiting pin passes through the limiting groove to limit the limiting rod.

[0019] By adopting the above technical solution, the limiting rod is inserted into the mounting frame and slid, so that the limiting rod sequentially slides through the reinforcing block, the first mounting plate, the second mounting plate and the connecting block. Then, the limiting pin in the connecting block is inserted into the limiting groove of the limiting rod, so that the limiting rod is fixed. The limiting rod limits the mounting frame, the reinforcing block, the first mounting plate, the second mounting plate and the support, making the mounting frame and the X-ray tube more firmly installed.

[0020] Preferably, a first sliding groove and a second sliding groove are respectively formed on both sides of the limiting rod in the connecting block. The depth of the second sliding groove is greater than that of the first sliding groove. The limiting pin is slidably arranged in the first sliding groove, the limiting groove and the second sliding groove. A second limiting convex strip is arranged in the middle of the top wall of the limiting pin. First limiting convex strips and third limiting convex strips are arranged at both ends of the bottom wall of the limiting pin. When the limiting pin passes through the limiting groove, the first limiting convex strip abuts against the bottom wall of the first sliding groove, the second limiting convex strip abuts against the top wall of the limiting groove, and the third limiting convex strip abuts against the bottom wall of the second sliding groove.

[0021] By adopting the above technical solution, when the limiting pin passes through the limiting groove, the limiting pin abuts against the first sliding groove, the limiting groove and the second sliding groove through the first limiting convex strip, the second limiting convex strip and the third limiting convex strip, so that the limiting rod is more firmly fixed by the limiting pin.

[0022] Preferably, a moving rod is rotatably arranged on the side wall of the connecting block. The moving rod is slidably arranged in the connecting block along the direction perpendicular to the sliding direction of the limiting pin. A locking block is arranged at one end of the moving rod close to the limiting pin. An elastic member for driving the moving rod to move away from the limiting pin is arranged on the connecting block. An inlet groove is formed on the side wall of the limiting pin. A rotating groove communicated with the inlet groove is formed in the limiting pin. A locking groove is formed on the side wall of the rotating groove close to the moving rod in the limiting pin. The locking block is slidably arranged in the inlet groove and rotatably arranged in the rotating groove. The elastic member drives the locking block to be clamped in the locking groove through the moving rod.

[0023] By adopting the above technical solution, after the limit pin passes through the limit groove, push the moving rod towards the direction close to the limit pin. The moving rod drives the lock block into the inlet groove, then rotate the moving rod. The moving rod drives the lock block to rotate in the rotating groove, and finally release the moving rod. The elastic member drives the lock block through the moving rod to be clamped in the lock groove, so that the limit pin can be fixed and the limit pin will not slip out of the limit groove.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. By using a rotating frame with a similar trapezoidal structure, the distances from the X-ray tube, the cooling system, the high-voltage box and the control chassis to the center of the scanning hole are smaller, reducing the centrifugal force on the components, thereby improving the operating stability of the large-aperture CT scanning device; 2. With the side plates installed along the tangent direction of the scanning hole, the distances from the side plates, the upper plate and the lower plate to the center of the scanning hole are smaller, which can further reduce the distances from each component to the center of the scanning hole, thereby further reducing the centrifugal force on the components; 3. By using two tension members in cooperation with two pull plates to tension and reinforce the first mounting plate and the second mounting plate and firmly mount the first mounting plate and the second mounting plate on the upper plate, the X-ray tube is more firmly installed. At the same time, the pre-collimator is installed on the upper plate through the mounting frame, making the pre-collimator more firmly installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the large-aperture CT scanning device in Embodiment 1 of the present application; Figure 2 It is a partial structural schematic diagram of the large-aperture CT scanning device in Embodiment 1 of the present application, highlighting the drive mechanism; Figure 3 It is a front view of a partial structure of the large-aperture CT scanning device in Embodiment 1 of the present application, highlighting the rotating frame; Figure 4 It is an exploded view of a partial structure of the large-aperture CT scanning device in Embodiment 1 of the present application; Figure 5 It is a partial structural schematic diagram of the large-aperture CT scanning device in Embodiment 2 of the present application; Figure 6 It is a partial structural cross-sectional view of the large-aperture CT scanning device in Embodiment 2 of the present application; Figure 7 It is a partial structural cross-sectional view of the large-aperture CT scanning device in Embodiment 2 of the present application, highlighting the limit pin; Figure 8 It is a partial structural cross-sectional view of the large-aperture CT scanning device in Embodiment 2 of the present application, highlighting the moving rod; Figure 9This is an exploded cross-sectional view of a partial structure of the large-aperture CT scanning device in Embodiment 2 of the present application, highlighting the lock groove for display purposes.

[0026] Reference numerals: 1, support frame; 2, fixed bracket; 3, rotating bracket; 4, scanning hole; 5, drive mechanism; 51, driving member, 52, driving wheel; 53, drive belt; 6, rotating frame; 61, connecting plate; 62, upper plate; 63, lower plate; 631, first plate body; 632, second plate body; 64, side plate; 7, X-ray tube; 9, counterweight; 10, cooling system; 11, high-voltage box; 12, control chassis; 13, tensioning mechanism; 131, tensioner; 132, first tensioning wheel; 133, second tensioning wheel; 14, ray opening; 15, first mounting plate; 16, second mounting plate; 17, support; 181, first pulling plate; 182, second pulling plate; 191, first tensioning member; 192, second tensioning member; 20, mounting frame; 21, reinforcement block; 22, limiting rod; 23, limiting block; 24, limiting groove; 25, limiting pin; 26, first chute; 27, second chute; 28, first limiting rib; 29, second limiting rib; 30, third limiting rib; 31, moving rod; 32, locking block; 33, elastic member; 34, inlet groove; 35, rotating groove; 36, lock groove; 37, rotating bearing; 38, pulling block; 39, pulling groove; 40, receiving groove; 41, connecting block. Detailed implementation manners

[0027] The following further elaborates on the present application in conjunction with the attached Figures 1-9 drawings for a more detailed description.

[0028] An embodiment of the present application discloses a large-aperture CT scanning device.

[0029] Embodiment 1: Referring to Figure 1 and Figure 2 , a large-aperture CT scanning device includes a support frame 1, a fixed bracket 2, and a rotating bracket 3. The support frame 1 is in a U shape. The two horizontal sides of the fixed bracket 2 are installed at the tops of both sides of the support frame 1. The rotating bracket 3 is rotatably installed in the fixed bracket 2 through a rotating bearing 37. A scanning hole 4 is formed in the rotating bearing 37, and the aperture of the scanning hole 4 is 800 - 850 mm.

[0030] A drive mechanism 5 is installed on the fixed bracket 2. The drive mechanism 5 includes a driving member 51, a driving wheel 52, and a drive belt 53. The driving member 51 is fixedly installed in the fixed bracket 2. The driving wheel 52 is fixedly installed on the drive shaft of the driving member 51. The drive belt 53 is sleeved on the driving wheel 52 and the rotating bracket 3. In the present application, the driving member 51 can be selected as a servo motor. The driving member 51 drives the drive belt 53 to rotate through the driving wheel 52, and the drive belt 53 then drives the rotating bracket 3 to rotate.

[0031] A tensioning mechanism 13 is installed on the fixed bracket 2. The tensioning mechanism 13 includes a tensioner 131, a first tensioning wheel 132 and two second tensioning wheels 133. The tensioner 131 is fixedly installed inside the fixed bracket 2. The first tensioning wheel 132 is installed on the movable end of the tensioner 131, and the first tensioning wheel 132 abuts against the outer side wall of the drive belt 53. The two second tensioning wheels 133 are rotatably installed inside the fixed bracket 2. The two second tensioning wheels 133 are respectively located on the upper and lower sides of the drive belt 53, and both of the two second tensioning wheels 133 abut against the outer side wall of the drive belt 53. The tensioning mechanism 13 is used to tension the drive belt 53, so that the drive belt 53 is not likely to slip.

[0032] Refer to Figure 1 and Figure 3 As shown in

[0033] A rotating frame 6 is installed on the side wall of the rotating bracket 3. When the rotating bracket 3 rotates, it will drive the rotating frame 6 to rotate synchronously. The rotating frame 6 includes a connecting plate 61, an upper plate 62, a lower plate 63 and two side plates 64. A circular hole is formed in the middle of the connecting plate 61. The connecting plate 61 is fixedly connected to the side wall of the rotating bracket 3, and the upper plate 62, the lower plate 63 and the two side plates 64 are all fixedly installed on the side wall of the connecting plate 61 away from the rotating bracket 3.

[0034] The upper plate 62 and the lower plate 63 are respectively located on the upper and lower sides of the scanning hole 4. The two side plates 64 are respectively located on the left and right sides of the scanning hole 4 and are installed along the tangent direction of the scanning hole 4. And both ends of each side plate 64 are fixedly connected to the ends on the same side of the upper plate 62 and the lower plate 63.

[0035] An X-ray tube 7 and a front collimator are respectively installed on the upper and lower sides of the upper plate 62. Cooling systems 10, high-voltage boxes 11 and control chassis 12 are respectively installed on the outer side walls of the two side plates 64 away from each other. A detector is installed on the surface of the connecting plate 61 close to the lower plate 63. A plurality of counterweight blocks 9 are detachably and fixedly installed on the first plate body 631 and the second plate bodies 632.

[0036] When the rotating bracket 3 drives the rotating frame 6 to rotate, the rotating frame 6 drives each component to rotate, thereby performing a CT scan on the patient. Since the rotating frame 6 has a trapezoid-like structure, the distances from the X-ray tube 7, the cooling system 10, the high-voltage box 11, and the control chassis 12 to the center of the scanning hole 4 are smaller, reducing the centrifugal force on the components and thus improving the operating stability of the large-bore CT scanning device.

[0037] Referring to Figure 4 , a rectangular ray opening 14 is formed in the upper plate 62. Above the ray opening 14, a first mounting plate 15 and a second mounting plate 16 are detachably and fixedly mounted on the upper plate 62 by bolts. The second mounting plate 16 is above the first mounting plate 15, and the X-ray tube 7 is detachably and fixedly mounted on the second mounting plate 16 through a support 17. Below the ray opening 14, a mounting frame 20 is detachably and fixedly mounted on the upper plate 62 by bolts, and the pre-collimator is installed in the mounting frame 20.

[0038] At the end of the first mounting plate 15 in the length direction, a pulling block 38 is fixedly mounted. A first tightening member 191 is threadedly installed in the pulling block 38. At one end of the top wall of the upper plate 62 in the length direction, a pulling groove 39 is formed. A first pulling plate 181 is placed in the pulling groove 39 of the upper plate 62, and the first tightening member 191 passes through the first pulling plate 181.

[0039] In the middle of the second mounting plate 16 in the width direction, a second tightening member 192 is threadedly installed. A second pulling plate 182 is slidably mounted on the second tightening member 192, and the second pulling plate 182 abuts against the side wall of the upper plate 62 in the width direction. In this application, both the first tightening member 191 and the second tightening member 192 can be selected as bolts.

[0040] After the first mounting plate 15 and the second mounting plate 16 are installed, rotate the first tightening member 191 and the second tightening member 192. The first tightening member 191 pulls the pulling block 38 to move towards the first pulling plate 181, and the first pulling plate 181 itself is tightened in the pulling groove 39, so that the first mounting plate 15 can be tightened through the first pulling plate 181 and the pulling block 38. The second tightening member 192 tightens the second mounting plate 16 through the second pulling plate 182, so that the X-ray tube 7 is installed more firmly.

[0041] The implementation principle of a large-aperture CT scanning device in an embodiment of this application is as follows: The driving member 51 drives the driving belt 53 to rotate through the driving wheel 52, and the driving belt 53 then drives the rotating bracket 3 to rotate. When the rotating bracket 3 rotates, it will drive the rotating frame 6 to rotate synchronously, and the rotating frame 6 drives each component to rotate, thereby performing a CT scan on the patient. Since the rotating frame 6 has a trapezoid-like structure, the distances from the X-ray tube 7, the cooling system 10, the high-voltage box 11, and the control chassis 12 to the center of the scanning hole 4 are smaller, reducing the centrifugal force on the components, thereby improving the operating stability of the large-aperture CT scanning device.

[0042] Embodiment 2: Referring to Figure 5 and Figure 6 In this embodiment, the difference from Embodiment 1 is that reinforcement blocks 21 are fixedly installed on both inner sidewalls in the length direction of the ray opening 14 of the upper plate 62, and two limiting rods 22 are slidably installed at both ends in the length direction of the mounting frame 20. Connecting blocks 41 are fixedly installed at both ends in the length direction of each support 17. The top of each limiting rod 22 sequentially slides through the reinforcement block 21, the first mounting plate 15, the second mounting plate 16, and the connecting block 41. A limiting block 23 is fixedly installed at the bottom end of the limiting rod 22, and four receiving grooves 40 are formed in the bottom wall of the mounting frame 20, and the four limiting blocks 23 are respectively located in the four receiving grooves 40.

[0043] Referring to Figure 6 and Figure 7 In this embodiment, a limiting groove 24 is formed in the top of the limiting rod 22 along its width direction. First sliding grooves 26 and second sliding grooves 27 are respectively formed on both sides of the limiting rod 22 in the connecting block 41. The depth of the second sliding groove 27 is greater than the depth of the limiting groove 24, and the depth of the first sliding groove 26 is less than the depth of the limiting groove 24. A limiting pin 25 is slidably installed in the first sliding groove 26 and the second sliding groove 27 of the connecting block 41, and the limiting pin 25 slides through the limiting groove 24. A second limiting protrusion 29 is fixedly installed in the middle of the top wall of the limiting pin 25 along its width direction, and first limiting protrusions 28 and third limiting protrusions 30 are fixedly installed at both ends of the bottom wall of the limiting pin 25 along its width direction.

[0044] When the limit rod 22 slides through the reinforcement block 21, the first mounting plate 15, the second mounting plate 16, and the connecting block 41, insert the limit pin 25 into the connecting block 41 from the second chute 27. The end of the limit pin 25 sequentially passes through the second chute 27 and the limit groove 24 and enters the first chute 26. At this time, the first limit rib 28, the second limit rib 29, and the third limit rib 30 are respectively located at the openings of the first chute 26, the limit groove 24, and the second chute 27. Subsequently, strike the end of the limit rod 22, and the limit rod 22 drives the first limit rib 28, the second limit rib 29, and the third limit rib 30 to simultaneously enter the first chute 26, the limit groove 24, and the second chute 27.

[0045] At this time, the first limit rib 28 abuts against the bottom wall of the first chute 26, the second limit rib 29 abuts against the top wall of the limit groove 24, and the third limit rib 30 abuts against the bottom wall of the second chute 27, thereby fixing the limit rod 22. At the same time, under the action of the second limit rib 29, the limit rod 22 can be pushed to slide upward, so that the limit block 23 is tightened in the receiving groove 40. The limit rod 22 reinforces the mounting frame 20, the reinforcement block 21, the first mounting plate 15, the second mounting plate 16, and the support 17, thereby further improving the stability of the installation of the X-ray tube 7 and the front collimator.

[0046] Refer to Figure 8 and Figure 9 As shown in, a moving rod 31 is installed on the side wall of the connecting block 41. The moving rod 31 is slidably installed in the connecting block 41 along the direction perpendicular to the moving direction of the limit pin 25, and the moving rod 31 is rotatably installed in the connecting block 41. An elastic member 33 is sleeved on the moving rod 31. In this application, the elastic member 33 can be selected as a spring, and one end of the elastic member 33 abuts against the outer side wall of the connecting block 41, and the other end abuts against the end of the moving rod 31.

[0047] A locking block 32 is fixedly installed at the end of the moving rod 31 close to the limit pin 25. An inlet groove 34 is formed on the side wall of the limit pin 25 close to the locking block 32. A rotating groove 35 is formed in the limit pin 25, and the rotating groove 35 communicates with the inlet groove 34. A locking groove 36 is formed on the inner side wall of the limit pin 25 where the rotating groove 35 is close to the moving rod 31, and the locking block 32 is slidably installed in the inlet groove 34 and the rotating groove 35.

[0048] After the limit pin 25 is installed, push the moving rod 31 towards the limit pin 25. The moving rod 31 drives the lock block 32 to move into the inlet groove 34, and the end of the moving rod 31 squeezes the elastic member 33. When the lock block 32 enters the inlet groove 34, rotate the moving rod 31. The moving rod 31 drives the lock block 32 to rotate in the rotating groove 35. When the lock block 32 rotates to the end of the rotating groove 35, release the moving rod 31. The elastic member 33 drives the lock block 32 to move into the locking groove 36 through the moving rod 31, so as to lock the limit pin 25, preventing the limit pin 25 from slipping out of the limit groove 24, thereby further improving the stability of the limit rod 22.

[0049] The implementation principle of Embodiment 2 of this application is as follows: When the limit rod 22 slides through the reinforcement block 21, the first mounting plate 15, the second mounting plate 16, and the connecting block 41, insert the limit pin 25 into the connecting block 41 from the second sliding groove 27. The end of the limit pin 25 sequentially passes through the second sliding groove 27 and the limit groove 24 and enters the first sliding groove 26. Then tap the limit rod 22 so that the first limit protrusion 28, the second limit protrusion 29, and the third limit protrusion 30 simultaneously enter the first sliding groove 26, the limit groove 24, and the second sliding groove 27. At this time, the first limit protrusion 28 abuts against the bottom wall of the first sliding groove 26, the second limit protrusion 29 abuts against the top wall of the limit groove 24, and the third limit protrusion 30 abuts against the bottom wall of the second sliding groove 27, thereby fixing the limit rod 22. The limit rod 22 reinforces the mounting bracket 20, the reinforcement block 21, the first mounting plate 15, the second mounting plate 16, and the support 17, thereby further improving the stability of the installation of the X-ray tube 7 and the pre-collimator.

[0050] The above are only optional embodiments of the present disclosure and are not used to limit the present disclosure. For those skilled in the art, the present disclosure can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A large-caliber CT scanning device, characterized in that: The invention comprises a support frame (1), a fixed support frame (2) and a rotating support frame (3), wherein the fixed support frame (2) is mounted on the support frame (1), the rotating support frame (3) is rotatably arranged in the fixed support frame (2), a scanning hole (4) is formed in the rotating support frame (3), and the aperture of the scanning hole (4) is 800-850 mm, a driving mechanism (5) for driving the rotating support frame (3) to rotate is arranged in the fixed support frame (2), and a rotating frame (6) is fixedly arranged on the rotating support frame (3), and the rotating frame (6) comprises a connecting plate (61), an upper plate (62), a lower plate (63) and two side plates (64). ), the connecting plate (61) is fixedly arranged on the side wall of the rotating bracket (3), the upper plate (62) is fixedly arranged on the connecting plate (61), an X-ray tube (7) is arranged on the side of the upper plate (62) away from the scanning hole (4), a front collimator is arranged on the side of the upper plate (62) close to the scanning hole (4), the lower plate (63) is parallel to the upper plate (62) and fixedly arranged on the connecting plate (61), a counterweight (9) is arranged on the lower plate (63), the upper plate (62) and the lower plate (63) are respectively located on both sides of the diameter direction of the scanning hole (4), and the length of the lower plate (63) is greater than that of the upper plate (6 2), the connecting plate (61) is located on one side of the scanning hole (4) close to the lower plate (63) and is provided with a detector, the two side plates (64) are fixedly arranged on the connecting plate (61) and are located on both sides of the scanning hole (4), the two ends of the side plates (64) are fixedly connected to the same side of the upper plate (62) and the lower plate (63), and the side walls of the two side plates (64) away from the scanning hole (4) are provided with a cooling system (10), a high-voltage box (11) and a control cabinet (12); a ray port (14) is formed in the upper plate (62), and the upper plate (62) is located above the ray port (14) and is stacked and fixed in a detachable manner A first mounting plate (15) and a second mounting plate (16) are provided, the second mounting plate (16) is located above the first mounting plate (15), the X-ray tube (7) is detachably fixedly arranged on the second mounting plate (16) via a support (17), a pull plate is arranged on both adjacent side walls of the upper plate (62), a tensioning member is arranged inside the pull plate, and the two tensioning members are respectively connected to the first mounting plate (15) and the second mounting plate (16), the upper plate (62) is located below the ray port (14) and is detachably fixedly arranged with a mounting frame (20), and the front collimator is detachably fixedly arranged inside the mounting frame (20);The upper plate (62) is fixedly provided with a reinforcement block (21) on the inner side wall of the ray port (14); a limit rod (22) is slidably penetrated in the mounting frame (20); a limit block (23) is provided at the bottom end of the limit rod (22); the limit block (23) abuts against the bottom wall of the mounting frame (20); a connecting block (41) is fixedly provided on the side wall of the bracket; the limit rod (22) slides through the reinforcement block (21), the first mounting plate (15), the second mounting plate (16) and the connecting block (41); a limit pin (25) is slidably provided in the connecting block (41); a limit slot (24) is provided at the top of the limit rod (22); the limit pin (25) passes through the limit slot (24) and limits the limit rod (22).

2. A large-caliber CT scanning device according to claim 1, characterized in that: The two side plates (64) are both arranged along the tangent direction of the scanning hole (4).

3. A large-caliber CT scanning device according to claim 2, characterized in that: The lower plate (63) comprises a first plate body (631) and two second plate bodies (632), wherein the first plate body (631) and the two second plate bodies (632) are both fixedly connected to the connecting plate (61), the first plate body (631) is parallel to the upper plate (62), the two second plate bodies (632) are fixedly arranged at two ends of the first plate body (631) in the length direction, the two second plate bodies (632) are inclined toward the upper plate (62), and the ends of the two second plate bodies (632) away from the first plate body (631) are respectively fixedly connected to the ends of the two side plates (64) away from the upper plate (62).

4. A large-caliber CT scanning device according to claim 1, characterized in that: The driving mechanism (5) comprises a driving member (51), a driving wheel (52) and a driving belt (53); the driving member (51) is fixedly arranged on a fixed bracket (2); the driving wheel (52) is arranged at a driving end of the driving member (51); the driving belt (53) is sleeved on the driving wheel (52) and the rotating bracket (3); and a tensioning mechanism (13) for tensioning the driving belt (53) is arranged on the fixed bracket (2).

5. A large-caliber CT scanning device according to claim 4, characterized in that: The tensioning mechanism (13) comprises a tensioner (131), a first tensioning wheel (132) and two second tensioning wheels (133); the tensioner (131) is fixedly arranged on a fixed bracket (2); the first tensioning wheel (132) is rotatably arranged on a driving end of the tensioner (131); the two second tensioning wheels (133) are both rotatably mounted on the fixed bracket (2) and are located at the upper and lower ends of a driving belt (53); and the first tensioning wheel (132) and the second tensioning wheel (133) are both in contact with the outer side wall of the driving belt (53).

6. A large-aperture CT scanning device according to claim 1, characterized in that: A first slide groove (26) and a second slide groove (27) are respectively provided on both sides of the limiting rod (22) in the connecting block (41); the depth of the second slide groove (27) is greater than the depth of the first slide groove (26); the limiting pin (25) is slidably arranged in the first slide groove (26), the limiting groove (24) and the second slide groove (27); a second limiting convex strip (29) is arranged in the middle of the top wall of the limiting pin (25); a first limiting convex strip (28) and a third limiting convex strip (30) are arranged at both ends of the bottom wall of the limiting pin (25); when the limiting pin (25) passes through the limiting groove (24), the first limiting convex strip (28) is pressed against the bottom wall of the first slide groove (26), the second limiting convex strip (29) is pressed against the top wall of the limiting groove (24), and the third limiting convex strip (30) is pressed against the bottom wall of the second slide groove (27).

7. The large-aperture CT scanning device according to claim 1, characterized in that: A moving rod (31) is rotatably arranged on the side wall of the connecting block (41). The moving rod (31) is slidably arranged in the connecting block (41) along the sliding direction of the vertical limit pin (25). A locking block (32) is arranged at one end of the moving rod (31) close to the limit pin (25). An elastic member (33) is arranged on the connecting block (41) for driving the moving rod (31) to move in a direction away from the limit pin (25). An inlet is provided on the side wall of the limit pin (25). A rotation groove (35) connected to the inlet groove (34) is provided in the limit pin (25); a locking groove (36) is provided on a side wall of the rotation groove (35) close to the moving rod (31) in the limit pin (25); the locking block (32) is slidably arranged in the inlet groove (34); the locking block (32) is rotatably arranged in the rotation groove (35); and the elastic member (33) drives the locking block (32) to be clamped in the locking groove (36) through the moving rod (31).

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