A fixture for manufacturing heat exchanger tube assemblies

Abstract

This utility model discloses a fixture for producing heat exchanger tube assemblies, relating to the field of mechanical technology. It includes a workbench with a clamping part on its top. The clamping part includes two symmetrical L-shaped clamping arms, which are hinged together by pins to form a V-shaped opening and closing structure. The hinge point is located at the center of the connection between the two clamping arms. Two wedges are symmetrically slidably arranged on the top surface of the workbench, located on opposite sides of the clamping part. This utility model, by providing multiple positioning steps on the inner side of the clamping arms, embedding pads in the positioning steps, and pre-reserving radial gaps between the pads and the inner sidewalls of the grooves on the sidewalls of the positioning steps, along with the radial fit gap between the key and the keyway, allows the pads to float radially when the heat exchanger tube assembly expands due to heat. This effectively compensates for the radial expansion of the copper tube and avoids the deformation or damage to the tube wall caused by the inability of traditional integrated fixtures to adapt to expansion under high-temperature conditions.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, specifically a fixture for producing heat exchanger tube assemblies. Background Technology

[0002] In the production and processing of heat exchanger tube assemblies, stable and precise clamping is a key step in ensuring processing quality.

[0003] However, existing fixtures for heat exchanger tube assembly production have some drawbacks in practical use: Since heat exchanger tube assemblies are mostly made of metal, thermal expansion is inevitable under high-temperature conditions, leading to an increase in tube diameter. Traditional fixtures, with their rigid, integrated clamping structures, cannot effectively compensate for this radial expansion. When the heat exchanger tube assembly expands, the rigid fixture generates intense interaction forces with the tube body. This can cause minor damage to the tube wall, affecting the sealing performance and service life of the heat exchanger tube assembly; or even cause the fixture itself to deform due to excessive force, reducing its service life and affecting the accuracy of subsequent processing. Utility Model Content

[0004] The purpose of this invention is to provide a fixture for producing heat exchanger tube assemblies to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides a fixture for producing heat exchanger tube assemblies, including a worktable. The top of the worktable is provided with a clamping part, which includes two symmetrical L-shaped clamping arms. The two clamping arms are hinged by a pin to form a V-shaped opening and closing structure. The hinge point is located at the center of the connection between the two clamping arms. Two wedges are symmetrically and slidably arranged on the top surface of the worktable. The two wedges are respectively located on both sides of the clamping part. The top of the worktable is provided with a transmission component to drive the wedges. The outer side walls of the two clamping arms are provided with V-shaped grooves that match the wedges. The inner side of the clamping arms is provided with multiple positioning steps. A liner is embedded in the positioning step. The side wall of the positioning step and the liner are respectively provided with grooves. A radial gap is reserved between the liner and the inner side wall of the groove.

[0006] Furthermore, a key bar is fixedly connected to the top surface of the gasket, and a keyway is opened in the inner top wall of the groove corresponding to the key bar. The key bar is slidably disposed inside the keyway, and the mating gap between the key bar and the keyway is set radially along the heat exchange tube assembly, allowing the gasket to float radially under thermal expansion conditions.

[0007] Furthermore, the transmission assembly includes two threaded rods, which are respectively threadedly connected to two wedges. Two first support plates and two second support plates are fixedly arranged at the edge of the worktable. The threaded rods are rotatably mounted on the side wall of the first support plate. A first pulley is fixedly sleeved on the end of the threaded rod near the first support plate. A second pulley is rotatably mounted on the side wall of the second support plate. The first pulley and the second pulley are connected by belt drive.

[0008] Furthermore, a drive shaft is rotatably mounted on the side wall of the second support plate, and the drive shaft is coaxially connected to the second pulley.

[0009] Furthermore, a rocker arm is provided on the outer wall of one of the second support plates, and the drive shaft passes through the side wall of the second support plate and is fixedly connected to the rocker arm.

[0010] Furthermore, a support base is fixedly connected to the top surface of the workbench, and the support base is located below the clamping part.

[0011] Furthermore, the padding includes four arc-shaped blocks, with an expansion joint reserved between the four arc-shaped blocks. The arc angle of the arc-shaped blocks is 15°, and the width of the expansion joint is 0.8-1.2mm.

[0012] Furthermore, the number of positioning steps is five, and the size of the five positioning steps increases sequentially from the center of the clamping part outwards, with the positioning size range of the positioning steps being 6-32mm.

[0013] Furthermore, the gasket is made of copper-aluminum alloy.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this utility model, by setting multiple positioning steps on the inner side of the clamping arm, embedding a liner on the positioning step, and reserving a radial gap between the liner and the inner side wall of the groove of the positioning step, and cooperating with the radial fit gap between the key bar and the keyway, the liner can float radially when the heat exchange tube assembly expands due to heat, effectively compensating for the radial expansion of the copper tube, and avoiding the problem of deformation or damage to the tube wall caused by the inability of traditional integrated clamps to adapt to expansion under high temperature conditions.

[0016] 2. In this utility model, the transmission shaft is driven to rotate by shaking the rocker arm, which drives the second pulleys at both ends of the transmission shaft to rotate synchronously. Then, the two first pulleys are driven to rotate by the belt drive, which in turn drives the two threaded rods to drive the left and right wedges synchronously. This achieves the synchronous action of the left and right wedges, ensuring that the top pressure on the clamping arm is uniform. This makes the clamping force of the clamping part on the heat exchange tube assembly more uniform and improves the processing accuracy of the heat exchange tube assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external three-dimensional structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the external three-dimensional structure of the transmission component of this utility model;

[0019] Figure 3 This is a schematic diagram of the external three-dimensional structure of the positioning step of this utility model;

[0020] Figure 4 This utility model Figure 3 A magnified view of a portion of point A in the middle.

[0021] In the diagram: 1. Workbench; 2. Clamping arm; 3. Wedge; 4. V-groove; 5. Positioning step; 6. Pad; 7. Groove; 8. Key bar; 9. Keyway; 10. Threaded rod; 11. First support plate; 12. Second support plate; 13. First pulley; 14. Second pulley; 15. Drive shaft; 16. Rocker arm; 17. Support base; 18. Arc block. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1 and Figure 3 This utility model provides a technical solution: a fixture for producing heat exchanger tube assemblies, including a workbench 1, a clamping part on the top of the workbench 1, the clamping part including two symmetrical L-shaped clamping arms 2, the two clamping arms 2 are hinged by a pin to form a V-shaped opening and closing structure, the hinge point is located at the center of the connection between the two clamping arms 2, two wedges 3 are symmetrically slidably arranged on the top surface of the workbench 1, the two wedges 3 are respectively located on both sides of the clamping part, a transmission component is provided on the top of the workbench 1 to drive the wedges 3, the outer side walls of the two clamping arms 2 are provided with V-shaped grooves 4 that match the wedges 3, multiple positioning steps 5 are provided on the inner side of the clamping arms 2, a pad 6 is embedded in the positioning step 5, the pad 6 is made of copper-aluminum alloy, the side wall of the positioning step 5 is provided with grooves 7 corresponding to the pad 6, the inner side wall of the pad 6 and the groove 7 are reserved with a radial gap, a support seat 17 is fixedly connected to the top surface of the workbench 1, the support seat 17 is located below the clamping part.

[0024] In practice, the symmetrical L-shaped clamping arms 2 are hinged by pins to form a V-shaped opening and closing structure. In the initial state, the two clamping arms 2 are open at a certain angle, which makes it convenient for the operator to place the heat exchange tube assembly into the clamping position. When clamping is required, the transmission component drives the wedge 3 to move towards the clamping arm 2. The wedge 3 cooperates with the V-shaped groove 4 on the outer wall of the clamping arm 2. As the wedge 3 continues to advance, it will gradually squeeze the clamping arm 2, causing the two clamping arms 2 to rotate around the hinge point and gradually close, thereby achieving the clamping of the heat exchange tube assembly. The positioning step 5 on the inner side of the clamping arm 2 can play a positioning role for the heat exchange tube assembly, ensuring that it will not shift during processing. The gasket 6 is embedded in the positioning step 5 and is in direct contact with the heat exchange tube assembly, which can avoid hard contact between the clamping arm 2 and the heat exchange tube assembly and reduce damage to the tube wall. The radial gap reserved between the gasket 6 and the inner wall of the groove 7 provides space for the thermal expansion of the heat exchange tube assembly and the gasket 6 at high temperature.

[0025] See Figure 3 and Figure 4 A key bar 8 is fixedly connected to the top surface of the gasket 6. A key groove 9 is opened in the inner top wall of the groove 7 corresponding to the key bar 8. The key bar 8 is slidably disposed inside the key groove 9. The mating gap between the key bar 8 and the key groove 9 is set along the radial direction of the heat exchange tube assembly, allowing the gasket 6 to float radially under thermal expansion conditions.

[0026] In practical implementation, the mating structure of the key bar 8 and the keyway 9 guides the movement of the gasket 6. When the heat exchange tube assembly expands due to heat during processing and the tube diameter increases, it exerts an outward squeezing force on the gasket 6. At this time, the gasket 6, under pressure, will drive the key bar 8 to slide radially along the heat exchange tube assembly within the keyway 9, allowing the gasket 6 to move smoothly radially outward. This compensates for the increased radial dimension of the heat exchange tube assembly due to thermal expansion. This design effectively avoids the problem of heat exchange tube assembly being crushed or fixture deformation caused by the inability to adapt to thermal expansion in traditional fixtures, ensuring the safety and stability of processing. At the same time, the key bar 8 is long and the keyway 9 is a continuous groove. The outer circumferential wall of the key bar 8 fits against the inner wall of the keyway 9. The mating of the key bar 8 and the keyway 9 prevents the gasket 6 from shifting or falling off during movement, ensuring that the gasket 6 can always accurately support and protect the heat exchange tube assembly.

[0027] See Figure 2 The transmission assembly includes two threaded rods 10, which are threadedly connected to two wedges 3 respectively. Two first support plates 11 and two second support plates 12 are fixedly installed at the edge of the workbench 1. The threaded rods 10 are rotatably mounted on the side wall of the first support plate 11. A first pulley 13 is fixedly sleeved on the end of the threaded rod 10 near the first support plate 11. A second pulley 14 is rotatably mounted on the side wall of the second support plate 12. The first pulley 13 and the second pulley 14 are connected by belt drive.

[0028] In specific implementation, when the first pulley 13 rotates under the drive of the belt, it will synchronously drive the threaded rod 10 to rotate. Since the threaded rod 10 is threadedly connected to the wedge 3 and the wedge 3 is symmetrically slidably arranged on the worktable 1, the rotation of the threaded rod 10 will be converted into the linear movement of the wedge 3 along the top surface of the worktable 1. The two threaded rods 10 respectively drive the two wedges 3. The belt transmission ensures the synchronicity of the rotation of the two first pulleys 13, thereby making the moving speed and distance of the two wedges 3 consistent. This synchronous movement ensures that the squeezing force on the two clamping arms 2 is uniform, so that the clamping force on the heat exchange tube assembly is evenly distributed, avoiding the problem of deformation of the heat exchange tube assembly or decrease in processing accuracy caused by uneven clamping force.

[0029] See Figure 2 A drive shaft 15 is rotatably mounted on the side wall of the second support plate 12. The drive shaft 15 is coaxially connected to the second pulley 14. When the drive shaft 15 rotates, it drives the second pulley 14 to rotate at the same speed and direction. The drive shaft 15 connects the two second pulleys 14, so that the operator only needs to drive the drive shaft 15 to drive the two second pulleys 14 to rotate at the same time, thereby realizing the synchronous action of the two first pulleys 13 and the threaded rod 10.

[0030] See Figure 1 One of the second support plates 12 has a rocker arm 16 on its outer side wall. A drive shaft 15 passes through the side wall of the second support plate 12 and is fixedly connected to the rocker arm 16. The rocker arm 16 provides a convenient operating component for the operator. By rocking the rocker arm 16, the operator can easily drive the drive shaft 15 to rotate. When the rocker arm 16 rotates clockwise, the drive shaft 15 rotates clockwise as well. Through a series of transmission relationships, the two wedges 3 move closer to the clamping arm 2, thereby clamping the heat exchange tube assembly. When the rocker arm 16 rotates counterclockwise, the drive shaft 15 rotates counterclockwise, causing the wedges 3 to move away from the clamping arm 2. The clamping arm 2 opens under its own weight or other external forces, making it convenient for the operator to remove the processed heat exchange tube assembly.

[0031] See Figure 3The gasket 6 includes four arc-shaped blocks 18, with expansion joints reserved between them. The arc angle of the arc-shaped blocks 18 is 15°, and the width of the expansion joints is 0.8-1.2mm. The four arc-shaped blocks 18 are combined to form an arc-shaped structure that fits the outer wall of the heat exchange tube assembly, allowing for a tight fit and improving clamping stability. Due to the certain diameter tolerance of the heat exchange tube assembly, the four independent arc-shaped blocks 18 can be slightly adjusted according to the actual tube diameter. Each arc-shaped block 18 can make good contact with the outer wall of the heat exchange tube assembly, avoiding the poor contact problem caused by the diameter tolerance of the traditional integral gasket 6. When the arc-shaped blocks 18 increase in volume due to thermal expansion, the expansion joints provide expansion space for them, preventing deformation caused by mutual compression between the arc-shaped blocks 18, thus ensuring the overall structural integrity and performance of the gasket 6.

[0032] See Figure 1 The fixture has five positioning steps 5, and the size of the five positioning steps 5 increases sequentially from the center of the clamping part outwards. The positioning size range of the positioning steps 5 is 6-32mm. The five positioning steps 5 of different sizes allow the fixture to adapt to heat exchanger tube assemblies of different specifications. The operator can select the appropriate size positioning step 5 for clamping according to the diameter of the heat exchanger tube assembly to be processed. When the diameter of the heat exchanger tube assembly is small, it can be placed on the positioning step 5 near the center of the clamping part; when the diameter is large, the positioning step 5 with the larger outer size is selected. This design greatly improves the versatility of the fixture and reduces the time and cost waste caused by changing different specifications of fixtures.

[0033] Working principle:

[0034] The left and right symmetrical L-shaped cast steel clamping arms 2 are hinged by pins to form a V-shaped opening and closing structure. The hinge point is located at the center of the bottom of the clamp. The stepped positioning step 5 set on the inner side of the clamping arm 2 is embedded in the copper alloy liner 6. The liner 6 and the side wall of the groove 7 are reserved with a radial gap. When the tube is heated and expands, the tube diameter increases, which makes the liner 6 squeezed. Under the action of thermal expansion, the liner 6 moves along the tube diameter direction to compensate for the radial expansion of the copper tube and avoid the deformation or damage to the tube wall caused by the thermal expansion of the copper tube under high temperature conditions.

[0035] The rocker arm 16 drives the threaded rod 10 to push the wedge block 3. The wedge block 3 presses against the V-shaped groove 4 on the back of the clamping arm 2, thereby clamping, fixing and self-locking the heat exchange tube assembly. By rocking the rocker arm 16, the drive shaft 15 rotates, which drives the second pulleys 14 at both ends of the drive shaft 15 to rotate synchronously. Through belt transmission, the two first pulleys 13 rotate, and then the two threaded rods 10 drive the left and right wedge blocks 3 synchronously to complete the clamping. The single integral gasket 6 cannot adapt to the pipe diameter tolerance. By dividing the gasket 6 into multiple arc-shaped blocks 18 with expansion gaps reserved between the segments, the flexibility and adaptability of the clamping are improved, ensuring the clamping effect and processing quality.

[0036] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fixture for producing heat exchanger tube assemblies, comprising a worktable (1), characterized in that, The workbench (1) is provided with a clamping part on the top. The clamping part includes two L-shaped clamping arms (2) that are symmetrical on the left and right. The two clamping arms (2) are hinged by a pin to form a V-shaped opening and closing structure. The hinge point is located at the center of the connection between the two clamping arms (2). The top surface of the workbench (1) is symmetrically and slidably provided with two wedges (3). The two wedges (3) are located on both sides of the clamping part. The top of the workbench (1) is provided with a transmission component to drive the wedges (3). The outer side walls of the two clamping arms (2) are provided with V-shaped grooves (4) that match the wedges (3). The inner side of the clamping arms (2) is provided with multiple positioning steps (5). A pad (6) is embedded in the positioning step (5). The side wall of the positioning step (5) and the pad (6) are respectively provided with grooves (7). The pad (6) and the inner side wall of the groove (7) are reserved with a radial gap.

2. The fixture for producing heat exchanger tube assemblies as described in claim 1, characterized in that, The top surface of the gasket (6) is fixedly connected to a key bar (8). The inner top wall of the groove (7) is provided with a key groove (9) corresponding to the key bar (8). The key bar (8) is slidably disposed inside the key groove (9). The mating gap between the key bar (8) and the key groove (9) is set along the radial direction of the heat exchange tube assembly, allowing the gasket (6) to float radially under thermal expansion conditions.

3. The fixture for producing heat exchanger tube assemblies as described in claim 1, characterized in that, The transmission assembly includes two threaded rods (10), which are threadedly connected to two wedges (3) respectively. Two first support plates (11) and two second support plates (12) are fixedly installed at the edge of the workbench (1). The threaded rods (10) are rotatably mounted on the side wall of the first support plate (11). A first pulley (13) is fixedly sleeved on one end of the threaded rod (10) near the first support plate (11). A second pulley (14) is rotatably mounted on the side wall of the second support plate (12). The first pulley (13) and the second pulley (14) are connected by belt drive.

4. The fixture for producing heat exchanger tube assemblies as described in claim 3, characterized in that, A drive shaft (15) is rotatably mounted on the side wall of the second support plate (12), and the drive shaft (15) is coaxially connected to the second pulley (14).

5. A fixture for producing heat exchanger tube assemblies as described in claim 4, characterized in that, One of the second support plates (12) has a rocker arm (16) on its outer side wall, and the drive shaft (15) passes through the side wall of the second support plate (12) and is fixedly connected to the rocker arm (16).

6. The fixture for producing heat exchanger tube assemblies as described in claim 1, characterized in that, The top surface of the workbench (1) is fixedly connected to a support base (17), which is located below the clamping part.

7. A fixture for producing heat exchanger tube assemblies as described in claim 1, characterized in that, The pad (6) includes four arc-shaped blocks (18), and an expansion joint is reserved between the four arc-shaped blocks (18). The arc angle of the arc-shaped blocks (18) is 15° and the width of the expansion joint is 0.8-1.2mm.

8. A fixture for producing heat exchanger tube assemblies as described in claim 1, characterized in that, The number of positioning steps (5) is five, and the size of the five positioning steps (5) increases sequentially from the center of the clamping part outwards. The positioning size range of the positioning steps (5) is 6-32mm.

9. A fixture for producing heat exchanger tube assemblies as described in claim 1, characterized in that, The pad (6) is made of copper-aluminum alloy.

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