Brazing tool clamp for tube shell assembly in medical CT bulb tube

Abstract

The invention discloses a brazing tool clamp for a tube shell assembly in a medical CT bulb tube. The brazing tool clamp comprises a supporting assembly, the tube shell assembly, a clamp assembly and a positioning assembly. The supporting assembly comprises a base and a lifting seat arranged above the base; the tube shell assembly comprises a stainless steel tube shell arranged on the base and a kovar alloy sealing ring clamped at the top end of the stainless steel tube shell; the clamp assembly comprises a ceramic ring arranged above the kovar alloy sealing ring, a balance weight seat clamped to the top end of the stainless steel tube shell and a positioning ring arranged outside the balance weight seat in a sleeving mode. The positioning assembly comprises a positioning seat arranged on the base and a positioning sleeve arranged on the lower bottom surface of the lifting seat; according to the invention, the counter weight seat and the stainless steel tube shell are coaxially placed by utilizing the matching effect of the positioning seat and the positioning sleeve, and the relative position between the kovar alloy sealing ring and the stainless steel tube shell is adjusted by utilizing the positioning ring, so that the quality and the use reliability of a welding joint are favorably improved.

Description

Technical Field

[0001] This invention relates to the field of medical CT tube manufacturing technology, specifically to a brazing fixture for the tube shell assembly of a medical CT tube. Background Technology

[0002] The CT tube is the core component of a CT scanner responsible for generating X-rays. It works by emitting electrons from an electron gun, which then strike the anode target at high speed in a high-vacuum environment to produce X-rays. These rays penetrate the human body, and the resulting signals are processed to generate tomographic images. Its performance parameters, such as heat capacity, heat dissipation efficiency, and X-ray stability, directly affect the clarity of CT imaging, the continuous operation capability of the equipment, and its lifespan. Early products suffered from low capacity and short lifespan due to technological limitations. However, modern tubes, thanks to advancements in materials science and precision manufacturing, have significantly improved in thermal management and stability, meeting clinical needs such as high resolution and rapid scanning. They are a key component ensuring the efficient and accurate operation of CT equipment.

[0003] The CT tube shell assembly is a key structure for maintaining the high vacuum environment inside the tube, primarily serving a sealing and support function. It is typically made of high-temperature resistant, highly insulating materials, effectively isolating the internal vacuum from the external atmosphere and protecting core components such as the electron gun and anode target from external environmental interference. The shell must withstand the high temperatures generated by electron impacts on the target and the stress from the high voltage inside the tube. Its sealing performance and structural stability directly affect the tube's vacuum level and lifespan. Damage or leakage will prevent the tube from generating X-rays properly, thus affecting the operation of the CT equipment. However, existing brazing fixtures have low weld qualification rates, making mass production difficult. Therefore, it is necessary to design specialized fixtures with multiple compensation functions to ensure the long-term reliability of the stainless steel shell and the Kovar alloy brazed joint. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a brazing fixture for the inner shell assembly of a medical CT tube.

[0005] The technical solution of the present invention is as follows: a brazing fixture for a tube shell assembly in a medical CT tube, comprising a support assembly, a tube shell assembly disposed on the support assembly, a clamp assembly for assembling the tube shell assembly, and a positioning assembly disposed on the support assembly and movably connected to the tube shell assembly and the clamp assembly respectively; the support assembly includes a base and a lifting seat disposed above the base; support sleeves are provided on both sides of the upper end face of the base; the lower bottom surface of the lifting seat is provided with a plug-in shaft that movably inserts into the two support sleeves in a one-to-one correspondence; a damping spring is provided inside the support sleeve that abuts against the plug-in shaft at the corresponding position;

[0006] The tube housing assembly includes a stainless steel tube housing movably mounted on a base and a Kovar alloy sealing ring movably snapped onto the top of the stainless steel tube housing; an annular welding tab is provided at the connection between the Kovar alloy sealing ring and the stainless steel tube housing.

[0007] The clamp assembly includes a ceramic ring disposed above the Kovar alloy sealing ring, a counterweight seat that is movably engaged with the top of the stainless steel tube shell and abuts against the upper end face of the ceramic ring, and a positioning ring that is sleeved on the outside of the counterweight seat and abuts against the Kovar alloy sealing ring; a through hole is provided through the center of the counterweight seat; and a first positioning groove is provided on the bottom surface of the positioning ring that can be movably engaged with the Kovar alloy sealing ring.

[0008] The positioning assembly includes a positioning seat mounted on the base and fitted onto the bottom of the stainless steel tube shell, and a positioning sleeve mounted on the bottom surface of the lifting seat with its center position corresponding to the positioning seat; the positioning sleeve can be inserted into the through hole.

[0009] Furthermore, an operating ring is provided on the upper surface of the lifting seat;

[0010] Note: The operating ring facilitates the control of the vertical movement of the lifting platform, improving the ease of use of this invention.

[0011] Furthermore, a second positioning groove is provided on the bottom surface of the counterweight base, and a positioning flange is provided on the upper surface of the ceramic ring that can be movably engaged with the second positioning groove;

[0012] Note: The cooperation between the positioning flange and the second positioning groove can improve the accuracy of the assembly of the ceramic ring and the counterweight seat.

[0013] Furthermore, a positioning step is provided at the bottom of the inner wall of the positioning ring, which can be movably engaged with the ceramic ring; guide bevels are provided on the inner walls of both the first positioning groove and the second positioning groove.

[0014] Explanation: The positioning step is used to movably engage the positioning ring and the ceramic ring, allowing for precise assembly of the positioning ring and the ceramic ring; and the guide bevel is set on the inner sidewall of the first positioning groove and the second positioning groove, which can improve the efficiency of docking the positioning ring with the Kovar alloy sealing ring and the ceramic ring with the counterweight seat.

[0015] Furthermore, several clamping blocks are evenly distributed on the inner wall of the positioning seat; each clamping block is slidably engaged with the inner wall of the positioning seat, and a compression spring is provided inside the positioning seat, which abuts against the ends of each clamping block that are far away from each other.

[0016] Note: After the stainless steel tube shell is placed inside the positioning seat, each clamping block clamps and fixes the stainless steel tube shell under the action of the corresponding compression spring, thus preventing the stainless steel tube shell from moving during the assembly of the Kovar alloy sealing ring.

[0017] Furthermore, each clamping block has a rubber protective head at one end that is close to the other;

[0018] Note: By installing rubber protective heads on the clamping blocks, it is possible to prevent the clamping blocks from scratching the outer wall of the stainless steel tube shell.

[0019] Furthermore, a sliding sleeve is connected to the top of the positioning sleeve via a positioning disc. The sliding sleeve passes through the lifting seat and is slidably engaged with it. An expansion assembly is provided inside the positioning sleeve, capable of engaging with the inner wall of the through hole. The expansion assembly includes two push plates slidably engaged inside the positioning sleeve, several expansion arc plates equidistantly distributed on the outer wall of the positioning sleeve and located between the two push plates, a movable push rod hinged between the expansion arc plates and the push plates, and a first screw rotatably engaged inside the positioning sleeve and threadedly connected to the two push plates. The internal threads on the two push plates rotate in opposite directions. Each expansion arc plate is provided with a connecting seat that passes through the positioning sleeve. Two sets of movable push rods are provided, with several in each set. One end of each set of movable push rods is slidably engaged with one of the two push plates, and the other end of each set is slidably engaged with each connecting seat. The top of the first screw passes through the sliding sleeve. A second screw is threadedly engaged with the upper surface of the positioning disc on the lifting seat.

[0020] Instructions: When in use, rotate the first screw, and the two push plates will move closer to each other under the action of the first screw. At this time, each movable push rod will push each connecting seat away from each other, and finally make each expansion arc plate move away from each other and engage with the inner wall of the through hole. Then rotate the second screw, so that the counterweight seat moves upward along the lifting seat with the positioning sleeve and sliding sleeve, which facilitates the assembly of the counterweight seat.

[0021] Furthermore, the bottom surface of the lifting seat is connected to a compression ring located above the positioning ring via an extension rod;

[0022] Explanation: By using the lifting seat to move the extrusion ring downwards and extrude force on the positioning ring, the uniformity of the force on the positioning ring can be ensured, thereby maintaining a consistent clearance between the Kovar alloy sealing ring and the stainless steel tube shell in various areas of the hole-shaft fit.

[0023] Furthermore, an unloading assembly is provided on the bottom surface of the lifting seat, sleeved outside the positioning ring; the unloading assembly includes a hollow mounting plate that is mounted on the bottom surface of the lifting seat via a mounting rod, a drive ring that rotates and locks inside the mounting plate, and several engagement blocks that are equidistantly distributed on the inner side wall of the mounting plate and abut against the drive ring respectively; a push handle that penetrates the outer side wall of the mounting plate is provided on the drive ring; each engagement block is slidably engaged with the inner wall of the mounting plate via a sliding post, and a return spring that abuts against each sliding post is provided inside the mounting plate; an arc-shaped drive plate that abuts against each sliding post is provided on the inner wall of the drive ring respectively;

[0024] Instructions: When removing the positioning ring, push the handle to rotate the drive ring inside the mounting plate. At this time, the sliding column, under the squeezing action of the arc-shaped drive plate, drives the corresponding biting block to approach the positioning ring and bite and lock the positioning ring. Then, lift the push handle to make the mounting plate, positioning ring and lifting seat move upward at the same time, which avoids the positioning ring from colliding with the counterweight seat and causing displacement between the stainless steel tube shell and the Kovar alloy sealing ring.

[0025] Furthermore, the mounting plate is equipped with a locking pin that can engage with the push handle.

[0026] Note: By using a locking pin to lock the push handle to the mounting plate, the engaging block can be prevented from disengaging from the positioning ring during the removal of the positioning ring, thus improving the reliability of the unloading component.

[0027] The method of using this invention is as follows:

[0028] First, clean the stainless steel tube shell, Kovar alloy sealing ring, and annular welding plate. Then, place the stainless steel tube shell inside the positioning seat. At this time, each clamping block clamps and fixes the stainless steel tube shell under the action of the corresponding compression spring. Then, place the annular welding plate and Kovar alloy sealing ring on the top of the stainless steel tube shell in sequence. Then, place the ceramic ring on the upper end of the Kovar alloy sealing ring, and snap the counterweight seat onto the top of the stainless steel tube shell. Sleeve the positioning ring on the outside of the counterweight seat and insert the Kovar alloy sealing ring into the positioning groove at the bottom of the first positioning groove of the positioning ring. Then, rotate the first screw. Under the action of the first screw, the two push plates move closer to each other. At this time, each movable push rod pushes each connecting seat away from each other, and finally makes each expansion arc plate move away from each other and snap into the inner wall of the through hole. Then, rotate the second screw so that the counterweight seat moves with the positioning sleeve and slides. The sleeve moves upward a certain distance along the lifting seat, reducing the pressure of the counterweight seat on the Kovar alloy sealing ring; the lifting seat is pressed down, and the extrusion ring is used to compress the positioning ring. The first positioning groove and the Kovar alloy sealing ring are engaged to ensure that the clearance of the hole-shaft fit between the Kovar alloy sealing ring and the stainless steel tube shell is consistent in each area; then the counterweight seat is lowered, and the drive ring is rotated inside the mounting plate by pushing the handle. At this time, the sliding column is driven by the extrusion of the arc-shaped drive plate to move the corresponding biting block close to the positioning ring and bite and lock the positioning ring. Then the push handle is lifted, so that the mounting plate, positioning ring and lifting seat move upward at the same time to remove the positioning ring. Finally, the assembled stainless steel tube shell, Kovar alloy sealing ring, ceramic ring and counterweight seat are placed in the vacuum furnace, and the stainless steel tube shell and Kovar alloy sealing ring are welded using annular welding plates.

[0029] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects:

[0030] First, the present invention has a reasonable structural design. By utilizing the cooperation of the positioning seat and the positioning sleeve, the counterweight seat and the stainless steel tube shell are placed coaxially. The positioning ring is used to adjust the relative position between the Kovar alloy sealing ring and the stainless steel tube shell, thereby enabling the solder to fully fill the gap between the Kovar alloy sealing ring and the stainless steel tube shell, thus improving the quality and reliability of the welded joint.

[0031] Secondly, the present invention utilizes the lifting seat to drive the extrusion ring to move downward and extrude the positioning ring, which can ensure the uniformity of the force on the positioning ring and make the gap of the hole-shaft fit between the Kovar alloy sealing ring and the stainless steel tube shell in each area consistent.

[0032] Third, by setting up an expansion component, the present invention facilitates the adjustment of the position of the counterweight seat, which not only increases the pressure of the counterweight seat on the ceramic ring and the Kovar alloy sealing ring, but also facilitates the adjustment of the position of the positioning ring on the Kovar alloy sealing ring when the downward pressure of the counterweight seat is reduced.

[0033] Fourth, the present invention disassembles the positioning ring by unloading the component, thus avoiding displacement between the stainless steel tube shell and the Kovar alloy sealing ring caused by the positioning ring colliding with the counterweight seat when the positioning ring is manually disassembled. Attached Figure Description

[0034] Figure 1 This is a longitudinal sectional view of the present invention;

[0035] Figure 2 This is the front view of the present invention;

[0036] Figure 3 This is a schematic diagram of the connection between the positioning sleeve and the counterweight seat of the present invention;

[0037] Figure 4 This is the present invention. Figure 3 A magnified view of a portion of point A in the middle;

[0038] Figure 5 This is a schematic diagram showing the connection between the clamping block and the positioning seat of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of the expansion component of the present invention;

[0040] Figure 7 This is a distribution diagram of the push plate of the present invention on the positioning sleeve;

[0041] Figure 8 This is a schematic diagram of the connection between the drive ring and the mounting plate of the present invention;

[0042] Figure 9 This is a schematic diagram of the connection between the engagement block and the drive ring of the present invention;

[0043] Among them, 1-support assembly, 10-base, 11-lifting seat, 12-support sleeve, 120-damping spring, 13-plug shaft, 14-operating ring, 2-tube shell assembly, 20-stainless steel tube shell, 21-Kovar alloy sealing ring, 22-ring weld plate, 3-clamp assembly, 30-ceramic ring, 300-positioning flange, 31-counterweight seat, 310-through hole, 311-second positioning groove, 32-positioning ring, 320-first positioning groove, 321-positioning step, 4-positioning assembly, 40-positioning seat, 41-positioning sleeve 410-Positioning disc, 411-Sliding sleeve, 42-Clamping block, 420-Compression spring, 421-Rubber protective head, 5-Expansion assembly, 50-Push plate, 51-Expansion arc plate, 510-Connecting seat, 52-Modible push rod, 53-First screw, 54-Second screw, 6-Extrusion ring, 60-Extension rod, 7-Unloading assembly, 70-Mounting disc, 700-Mounting rod, 71-Drive ring, 710-Push handle, 711-Arc-shaped drive plate, 72-Biting block, 720-Sliding column, 721-Reset spring. Detailed Implementation

[0044] Example 1

[0045] like Figure 1 The brazing fixture for a medical CT tube shell assembly shown includes a support assembly 1, a shell assembly 2 mounted on the support assembly 1, a clamp assembly 3 for assembling the shell assembly 2, and a positioning assembly 4 mounted on the support assembly 1 and movably connected to the shell assembly 2 and the clamp assembly 3. The support assembly 1 includes a base 10 and a lifting seat 11 mounted above the base 10. Support sleeves 12 are provided on both sides of the upper end face of the base 10. The lower bottom surface of the lifting seat 11 is provided with a plug-in shaft 13 that is movably inserted into the two support sleeves 12 in a one-to-one correspondence. The support sleeve 12 is provided with a damping spring 120 that abuts against the plug-in shaft 13 at the corresponding position. An operating ring 14 is provided on the upper end face of the lifting seat 11.

[0046] like Figure 1 , 4 As shown, the tube shell assembly 2 includes a stainless steel tube shell 20 movably mounted on the base 10 and a Kovar alloy sealing ring 21 movably snapped onto the top of the stainless steel tube shell 20; an annular welding piece 22 is provided at the connection between the Kovar alloy sealing ring 21 and the stainless steel tube shell 20.

[0047] like Figure 1 , 3As shown in Figure 4, the clamp assembly 3 includes a ceramic ring 30 disposed above the Kovar alloy sealing ring 21, a counterweight 31 movably engaged with the top of the stainless steel tube shell 20 and abutting against the upper end face of the ceramic ring 30, and a positioning ring 32 sleeved on the outside of the counterweight 31 and abutting against the Kovar alloy sealing ring 21; a through hole 310 is provided through the center of the counterweight 31; a first positioning groove 320 is provided on the bottom surface of the positioning ring 32, which can be movably engaged with the Kovar alloy sealing ring 21;

[0048] like Figure 1 , 3 As shown, the positioning component 4 includes a positioning seat 40 disposed on the base 10 and sleeved on the bottom end of the stainless steel tube shell 20, and a positioning sleeve 41 disposed on the lower surface of the lifting seat 11 and whose center position corresponds to the positioning seat 40 vertically; the positioning sleeve 41 can be inserted into the through hole 310.

[0049] Example 2

[0050] The difference between this embodiment and Embodiment 1 is that:

[0051] like Figure 4 As shown, the bottom surface of the counterweight 31 is provided with a second positioning groove 311, and the upper end surface of the ceramic ring 30 is provided with a positioning flange 300 that can be movably engaged with the second positioning groove 311; the bottom end of the inner wall of the positioning ring 32 is provided with a positioning step 321 that can be movably engaged with the ceramic ring 30; guide bevels are provided on the inner walls of both the first positioning groove 320 and the second positioning groove 311; the cooperation of the positioning flange 300 and the second positioning groove 311 can improve the accuracy of the assembly of the ceramic ring 30 and the counterweight 31; the positioning step 321 is used to movably engage the positioning ring 32 and the ceramic ring 30, so that the positioning ring 32 and the ceramic ring 30 are precisely assembled; and the guide bevels on the inner walls of the first positioning groove 320 and the second positioning groove 311 can improve the efficiency of the docking of the positioning ring 32 with the Kovar alloy sealing ring 21 and the ceramic ring 30 with the counterweight 31.

[0052] Example 3

[0053] The difference between this embodiment and Embodiment 2 is that:

[0054] like Figure 5As shown, eight clamping blocks 42 are evenly distributed on the inner wall of the positioning seat 40; each clamping block 42 is slidably engaged with the inner wall of the positioning seat 40; a compression spring 420 is provided inside the positioning seat 40, which abuts against the ends of each clamping block 42 that are far apart from each other; a rubber protective head 421 is provided at the ends of each clamping block 42 that are close to each other; when the stainless steel tube shell 20 is placed inside the positioning seat 40, each clamping block 42 clamps and fixes the stainless steel tube shell 20 under the action of the corresponding compression spring 420, thus preventing the stainless steel tube shell 20 from moving during the assembly of the Kovar alloy sealing ring 21.

[0055] Example 4

[0056] The difference between this embodiment and Embodiment 3 is that:

[0057] like Figure 3 , 6 As shown in Figure 7, the top end of the positioning sleeve 41 is connected to a sliding sleeve 411 via a positioning disc 410. The sliding sleeve 411 passes through the lifting seat 11 and is slidably engaged with the lifting seat 11. An expansion assembly 5 is provided inside the positioning sleeve 41, which can engage with the inner wall of the through hole 310. The expansion assembly 5 includes two push plates 50 that are slidably engaged inside the positioning sleeve 41, four expansion arc plates 51 that are equidistantly distributed on the outer wall of the positioning sleeve 41 and located between the two push plates 50, a movable push rod 52 that is movably hinged between the expansion arc plates 51 and the push plates 50, and a first screw 53 that is rotatably engaged inside the positioning sleeve 41 and threadedly connected to the two push plates 50 respectively. The internal threads on the two push plates 50 have opposite directions of rotation. Each expansion arc plate 51 is provided with a connecting seat 510 that passes through the positioning sleeve 41. 2. Two sets of movable push rods 52 are provided, with four rods in each set. One end of each set of movable push rods 52 is movably hinged to one of the two push plates 50, and the other end of each set of movable push rods 52 is movably hinged to each connecting seat 510. The top end of the first screw 53 passes through the sliding sleeve 411. The lifting seat 11 is threaded with a second screw 54 that is rotatably engaged with the upper end face of the positioning disc 410. In use, the first screw 53 is rotated, and the two push plates 50 move closer to each other under the action of the first screw 53. At this time, each movable push rod 52 pushes each connecting seat 510 away from each other, and finally makes each expansion arc plate 51 move away from each other and engage with the inner wall of the through hole 310. Then the second screw 54 is rotated, so that the counterweight seat 31 moves upward along the lifting seat 11 with the positioning sleeve 41 and the sliding sleeve 411, which facilitates the assembly of the counterweight seat 31.

[0058] Example 5

[0059] The difference between this embodiment and embodiment 4 is that:

[0060] like Figure 3As shown, the lower bottom surface of the lifting seat 11 is connected to the compression ring 6 located above the positioning ring 32 via the extension rod 60; by using the lifting seat 11 to drive the compression ring 6 to move downward and compress the positioning ring 32, the uniformity of the force on the positioning ring 32 can be ensured, thereby keeping the gap of the hole-shaft fit between the Kovar alloy sealing ring 21 and the stainless steel tube shell 20 consistent in each area.

[0061] Example 6

[0062] The difference between this embodiment and embodiment 5 is that:

[0063] like Figure 2 , 8 As shown in Figure 9, an unloading assembly 7 is sleeved on the lower surface of the lifting seat 11 and fitted outside the positioning ring 32. The unloading assembly 7 includes a hollow mounting plate 70 mounted on the lower surface of the lifting seat 11 via a mounting rod 700, a drive ring 71 that rotates and locks inside the mounting plate 70, and eight engagement blocks 72 that are equidistantly distributed on the inner sidewall of the mounting plate 70 and abut against the drive ring 71. A push handle 710 is provided on the drive ring 71 that penetrates the outer sidewall of the mounting plate 70. Each engagement block 72 is slidably engaged with the inner wall of the mounting plate 70 via a sliding post 720. The mounting plate 70 is provided with engagement blocks that abut against each sliding post 720. The return spring 721 is connected; the inner wall of the drive ring 71 is provided with arc-shaped drive plates 711 that abut against each sliding column 720 respectively; the mounting plate 70 is provided with locking pins that can be engaged with the push handle 710; when the positioning ring 32 is removed, the drive ring 71 is rotated inside the mounting plate 70 by pushing the handle 710. At this time, the sliding column 720 is driven by the squeezing action of the arc-shaped drive plate 711 to move the corresponding biting block 72 close to the positioning ring 32 and bite and lock the positioning ring 32. Then, the push handle 710 is lifted, so that the mounting plate 70, the positioning ring 32 and the lifting seat 11 move upward at the same time.

Claims

1. A brazing fixture for the inner shell assembly of a medical CT tube, characterized in that, The system includes a support assembly (1), a shell assembly (2) mounted on the support assembly (1), a clamp assembly (3) for assembling the shell assembly (2), and a positioning assembly (4) mounted on the support assembly (1) and movably connected to the shell assembly (2) and the clamp assembly (3), respectively. The support assembly (1) includes a base (10) and a lifting seat (11) mounted above the base (10). Support sleeves (12) are provided on both sides of the upper end face of the base (10). The lower bottom surface of the lifting seat (11) is provided with a plug-in shaft (13) that is movably inserted into the two support sleeves (12) in a one-to-one correspondence. The support sleeve (12) is provided with a damping spring (120) that abuts against the plug-in shaft (13) at the corresponding position. The tube shell assembly (2) includes a stainless steel tube shell (20) movably mounted on the base (10) and a Kovar alloy sealing ring (21) movably snapped onto the top of the stainless steel tube shell (20); an annular welding piece (22) is provided at the connection between the Kovar alloy sealing ring (21) and the stainless steel tube shell (20). The clamp assembly (3) includes a ceramic ring (30) disposed above the Kovar alloy sealing ring (21), a counterweight (31) movably engaged with the top of the stainless steel tube shell (20) and abutting against the upper surface of the ceramic ring (30), and a positioning ring (32) sleeved on the outside of the counterweight (31) and abutting against the Kovar alloy sealing ring (21); a through hole (310) is provided through the center of the counterweight (31); a first positioning groove (320) is provided on the bottom surface of the positioning ring (32) that can be movably engaged with the Kovar alloy sealing ring (21); The positioning component (4) includes a positioning seat (40) disposed on the base (10) and sleeved on the bottom end of the stainless steel tube shell (20) and a positioning sleeve (41) disposed on the lower surface of the lifting seat (11) and whose center position corresponds to the positioning seat (40) above and below; the positioning sleeve (41) can be inserted into the through hole (310).

2. The brazing fixture for the inner shell assembly of a medical CT tube according to claim 1, characterized in that, The counterweight base (31) has a second positioning groove (311) on its bottom surface, and the ceramic ring (30) has a positioning flange (300) on its upper surface that can be movably engaged with the second positioning groove (311).

3. The brazing fixture for the inner shell assembly of a medical CT tube according to claim 2, characterized in that, The bottom of the inner wall of the positioning ring (32) is provided with a positioning step (321) that can be movably engaged with the ceramic ring (30); the inner walls of the first positioning groove (320) and the second positioning groove (311) are both provided with guide bevels.

4. The brazing fixture for the inner shell assembly of a medical CT tube according to claim 1, characterized in that, Several clamping blocks (42) are evenly distributed on the inner wall of the positioning seat (40); each clamping block (42) is slidably engaged with the inner wall of the positioning seat (40), and a compression spring (420) is provided inside the positioning seat (40) to abut against the ends of each clamping block (42) that are far away from each other.

5. The brazing fixture for the inner shell assembly of a medical CT tube according to claim 1, characterized in that; The top end of the positioning sleeve (41) is connected to a sliding sleeve (411) via a positioning disc (410). The sliding sleeve (411) passes through the lifting seat (11) and is slidably engaged with the lifting seat (11). An expansion assembly (5) capable of engaging with the inner wall of the through hole (310) is provided inside the positioning sleeve (41). The expansion assembly (5) includes two push plates (50) that are slidably engaged with the inside of the positioning sleeve (41), several expansion arc plates (51) that are equidistantly distributed on the outer wall of the positioning sleeve (41) and located between the two push plates (50), a movable push rod (52) that is movably hinged between the expansion arc plate (51) and the push plate (50), and a rotatably engaged with the inside of the positioning sleeve (41) and a sliding push rod (52). The first screw (53) is not threaded to the two push plates (50); the internal threads on the two push plates (50) are in opposite directions; each of the expansion arc plates (51) is provided with a connecting seat (510) that passes through the positioning sleeve (41); the movable push rod (52) is provided in two sets, and each set has several rods, one end of the two sets of movable push rods (52) is movably hinged to the two push plates (50) respectively, and the other end of the two sets of movable push rods (52) is movably hinged to each of the connecting seats (510); the top end of the first screw (53) passes through the sliding sleeve (411); the lifting seat (11) is threaded with a second screw (54) that is rotatably engaged with the upper end face of the positioning disc (410).

6. The brazing fixture for the inner shell assembly of a medical CT tube according to claim 1, characterized in that, The bottom surface of the lifting seat (11) is connected to a compression ring (6) located above the positioning ring (32) via an extension rod (60).

7. The brazing fixture for the inner shell assembly of a medical CT tube according to claim 1, characterized in that, The lower surface of the lifting seat (11) is provided with an unloading assembly (7) sleeved on the outside of the positioning ring (32); the unloading assembly (7) includes a hollow mounting plate (70) mounted on the lower surface of the lifting seat (11) via a mounting rod (700), a drive ring (71) rotating and clamping inside the mounting plate (70), and several engagement blocks (72) equidistantly distributed on the inner sidewall of the mounting plate (70) and respectively abutting against the drive ring (71); the drive ring ( 71) is provided with a push handle (710) that penetrates the outer wall of the mounting plate (70); each of the engagement blocks (72) is slidably engaged with the inner wall of the mounting plate (70) through a sliding post (720); the mounting plate (70) is provided with a return spring (721) that abuts against each of the sliding posts (720); the inner wall of the drive ring (71) is provided with an arc-shaped drive plate (711) that abuts against each of the sliding posts (720) one by one.

8. The brazing fixture for the inner shell assembly of a medical CT tube according to claim 1, characterized in that, A compression ring (6) is provided on the bottom surface of the lifting seat (11). The compression ring (6) is located above the positioning ring (32), and the compression ring (6) is fixedly connected to the lifting seat (11) through the extension rod (60).

Images