Plate heat exchanger riveting tool

Abstract

The utility model relates to a plate heat exchanger riveting tool belongs to the field of automobile air conditioner parts assembly, the utility model discloses a kind of riveting tool innovation scheme of fusion mechanical self-locking and automatic reset. Including oppositely arranged upper die assembly and lower die assembly;The punch is set on the side of the upper die assembly towards the lower die assembly;The lower die assembly is provided with fixed seat and movable seat on the side of the upper die assembly, and the movable seat is driven along the direction of approaching or away from the fixed seat and is movably arranged by inclined block transmission mechanism. The perpendicular thrust of fast clip is converted into the horizontal displacement of movable seat by driving inclined block and fixed inclined block inclined surface cooperation in the scheme, realizes the full contact surface clamping of pipe fitting, eliminates clearance matching contradiction;Spring reset system is integrated simultaneously, riveting is completed after instantaneous release clamping force, avoid the damage of part caused by artificial strong disassembly. The design improves riveting efficiency and stability, shortens the time of taking piece.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts assembly and relates to a riveting fixture for plate heat exchangers. Background Technology

[0002] In the manufacturing process of plate heat exchangers, the pre-fixation of the top plate, inlet pipe, outlet pipe, and joints is usually achieved using riveting. Traditional riveting fixtures place the pipe fittings in the fixture's positioning holes, place the top plate, and then press down with a punch to complete the riveting. However, existing technology has significant drawbacks: First, when the clearance between the pipe fitting and the fixture's positioning holes is too small, the pipe fitting may deform and become stuck in the fixture after riveting, requiring external force for disassembly and reducing production efficiency. Second, if the clearance is too large, the contact area between the pipe fitting steps and the fixture is insufficient, leading to localized stress concentration on the steps during riveting, causing damage or plastic deformation and resulting in fluctuations in riveting quality. These problems are mentioned in many patent documents and industry technical reports involving plate heat exchanger riveting, and it is generally believed that the root cause lies in the lack of an adaptive clamping mechanism in traditional fixtures, which cannot accommodate variations in pipe fitting tolerances while ensuring uniform stress distribution.

[0003] To improve riveting stability, some improvement schemes have attempted to optimize the tolerance of the positioning holes or add elastic bushings, but the fundamental contradiction remains unresolved: an overly tight fit still leads to pipe jamming, while an overly loose fit cannot prevent step damage. Other literature proposes using pneumatic grippers to replace the fixing holes, but pneumatic systems increase equipment complexity and maintenance costs, and improper clamping force control can still crush the pipe step. Therefore, existing technologies consistently struggle to balance clamping reliability, operational efficiency, and structural simplicity. Utility Model Content

[0004] In view of this, this application aims to provide a riveting fixture that uses an inclined plane for self-locking and driving, thereby improving the ease of operation.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A riveting fixture for a plate heat exchanger includes an upper die assembly and a lower die assembly arranged opposite to each other. The upper die assembly is movably disposed in a direction close to or away from the lower die assembly. A punch is provided on the side of the upper die assembly facing the lower die assembly. A fixed seat and a movable seat are provided on the side of the lower die assembly facing the upper die assembly. The movable seat is movably disposed in a direction close to or away from the fixed seat. A drive module for pushing the movable seat is provided on the side of the movable seat away from the fixed seat.

[0007] Optionally, the fixed seat and the movable seat are connected by a guide post.

[0008] Optionally, a return spring is provided on the guide post.

[0009] Optionally, a first clamping block is fixedly installed on the fixed seat, and a second clamping block is fixedly installed on the movable seat. The components of the plate heat exchanger are clamped by the cooperation of the first clamping block and the second clamping block.

[0010] Optionally, the fixing seat is provided with a dovetail groove for fixing the first clamping block.

[0011] Optionally, the movable seat is provided with a dovetail groove for fixing the second clamping block.

[0012] Optionally, the drive module includes a quick clamp and a drive ramp fixed to the end of the quick clamp; the lower mold assembly is provided with a fixed ramp that cooperates with the drive ramp, and the fixed ramp and the drive ramp are provided with inclined surfaces with matching slopes, so that the pushing of the quick clamp is converted into the movement of the movable seat through the inclined surface cooperation.

[0013] Optionally, the pushing direction of the quick clamp is perpendicular to the moving direction of the movable seat.

[0014] Optionally, the lower mold assembly is provided with a slide rail, and the fixed inclined block is disposed on the slide rail, so that the relative position of the fixed inclined block and the movable seat can be adjusted by the slide rail.

[0015] Optionally, a guide rod is provided between the upper mold assembly and the lower mold assembly.

[0016] The beneficial effects of this utility model are as follows:

[0017] This solution achieves multiple technological breakthroughs in the riveting process of plate heat exchanger tubes through the innovative collaborative design of the inclined block transmission mechanism and the spring reset system, specifically manifested in the following core advantages:

[0018] Completely eliminate pipe fitting damage and ensure stable riveting quality.

[0019] Traditional tooling relies on the clearance fit between the pipe fitting and the positioning hole, which can easily lead to localized stress concentration at the step due to accumulated tolerances. This solution innovatively employs a self-locking mechanism with a driving and fixed inclined block. Manually pushing the quick clamp generates a vertical driving force, which is converted into horizontal displacement of the movable seat via the matched slope, driving the second clamping block to move precisely towards the first clamping block. This mechanism forces the stepped surface of the pipe fitting to form a full contact surface with the cavities of the two clamping blocks, increasing the force-bearing area and fundamentally preventing step crushing or plastic deformation. The dovetail-groove fixed clamping block further strengthens the structural rigidity, ensuring uniform force transmission under riveting impact and improving the riveting qualification rate.

[0020] Significantly improve production efficiency and reduce manual labor intensity

[0021] This design integrates a return spring on the guide post. After riveting, the quick clamp is released, driving the inclined block to move and release the inclined surface constraint. The spring force immediately pushes the movable seat to return to its horizontal position, causing the second clamping block to automatically detach from the pipe fitting. This process achieves "zero-intervention clamp release." Simultaneously, the guide rod (unmarked) between the upper and lower die assemblies ensures precise punch alignment, eliminating the need for secondary adjustments.

[0022] Expand tooling compatibility and reduce equipment modification costs

[0023] When the pipe diameter changes, the clamping blocks, which use a dovetail joint, allow for quick changeovers by replacing them with different specifications.

[0024] The purely mechanical structure achieves high reliability and extremely low maintenance costs.

[0025] Compared to pneumatic or hydraulic clamping solutions, this fixture relies entirely on the self-locking mechanism of the inclined blocks and the spring return mechanism, eliminating the need for circuitry, pneumatic systems, or precision sensors, thus reducing the failure rate. The return spring is made of high-fatigue-life silicon-manganese steel; the inclined surfaces of the driving and fixed inclined blocks are carburized and hardened to improve wear resistance.

[0026] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of the overall plan;

[0029] Figure 2 This is a top view of the lower mold component in this design.

[0030] Figure 3 This diagram illustrates different positions of the quick-clamp in this solution.

[0031] Figure 4 This is a schematic diagram of a plate heat exchanger.

[0032] Figure 5 for Figure 4 AA cross-section view;

[0033] Figure 6 for Figure 5 A magnified view of area B.

[0034] Reference numerals: 1 Upper die assembly, 11 Punch, 2 Lower die assembly, 21 Fixed seat, 22 Return spring, 23 Guide post, 24 First clamping block, 25 Second clamping block, 26 Movable seat, 27 Driving inclined block, 28 Fixed inclined block, 29 Quick clamp, 3 Plate heat exchanger, 31 Plate, 32 Pipe fitting. Detailed Implementation

[0035] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0037] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] Please see Figures 1-6 This solution provides a tooling for riveting plates and pipes in a plate heat exchanger. The plates include, but are not limited to, top plates or bottom plates, and the pipes include, but are not limited to, liquid outlet pipes or liquid inlet pipes. During the riveting process, the pipes need to be clamped, and then the top plate is placed. The riveting is completed by the action of a punch.

[0039] Device Structure

[0040] This embodiment provides a riveting fixture for a plate heat exchanger 3, used to rivet the plates 31 (such as the top plate or bottom plate) and pipes 32 (such as the inlet pipe or outlet pipe) of the plate heat exchanger 3. Figure 1 As shown, the fixture includes an upper mold assembly 1 and a lower mold assembly 2 arranged opposite to each other. The upper mold assembly 1 is driven by a hydraulic press to move vertically towards or away from the lower mold assembly 2. The specific component structure of this fixture is as follows:

[0041] Upper mold assembly 1: A punch 11 is provided facing downwards for riveting pipe fitting 32;

[0042] Lower mold assembly 2: includes a fixed base 21 and a movable base 26. The movable base 26 is movably positioned to move closer to or further away from the fixed base 21 in the horizontal direction via guide posts 23.

[0043] Guide structure: A guide rod (unmarked) is provided between the upper die assembly 1 and the lower die assembly 2 to ensure stamping alignment accuracy.

[0044] Clamping mechanism of lower mold assembly 2

[0045] Clamping blocks: The first clamping block 24 is fixedly installed on the fixed seat 21, and the second clamping block 25 is fixedly installed on the movable seat 26. The two work together to clamp the stepped surface of the pipe fitting 32.

[0046] Fixing method: The first clamping block 24 is fixed to the fixed base 21 through the dovetail groove, and the second clamping block 25 is fixed to the movable base 26 through the dovetail groove.

[0047] Reset mechanism: A reset spring 22 is sleeved on the guide post 23, connecting the movable seat 26 and the fixed seat 21, and is used to drive the movable seat 26 to reset.

[0048] Inclined block mechanism: The drive module includes a quick clamp 29 and a drive inclined block 27 fixed at its end. The lower mold assembly 2 is provided with a fixed inclined block 28 that cooperates with the inclined surface of the drive inclined block 27.

[0049] The direction of push of quick clamp 29 is perpendicular to the direction of movement of movable seat 26;

[0050] The slope of the driving inclined block 27 is matched with that of the fixed inclined block 28, and the vertical push of the quick clamp 29 is converted into the horizontal movement of the movable seat 26 through the inclined surface cooperation.

[0051] Slide rail adjustment: The fixed inclined block 28 is mounted on the lower die assembly 2 via a slide rail, and its position can be adjusted along the slide rail to change the ratio between the feed distance of the quick clamp 29 and the moving distance of the movable seat 26. After adjustment, the fixed inclined block 28 is locked with bolts to ensure that the relative position of the fixed inclined block 28 and the fixed seat 21 remains unchanged during riveting.

[0052] In this scheme, the movement direction of the fixed seat 21 and the movable seat 26 is guided by the guide post 23. The guide post 23 can be a telescopic rod, or a fixed rod and sleeve respectively set on the fixed seat 21 and the movable seat 26. The direction guidance is achieved by the movement of the fixed rod in the sleeve. In this scheme, the movement direction of the upper mold assembly 1 and the lower mold assembly 2 is guided by the guide rod. The structure of the guide rod is similar to that of the guide post 23, and will not be described in detail.

[0053] In this embodiment, the fixed wedge block 28 is mounted on the lower mold assembly 2 via a slide rail. The position of the fixed wedge block 28 can be adjusted along the slide rail, thereby adjusting the relationship between the feed distance of the quick clamp 29 and the moving distance of the movable seat 26. After adjusting the position of the fixed wedge block 28, it needs to be fixed. It can be fixed by conventional fixing methods such as bolts. During the riveting process, both the fixed wedge block 28 and the fixed seat 21 must remain in a fixed and locked state, and the relative position of the fixed wedge block 28 and the fixed block remains unchanged.

[0054] Riveting process

[0055] Fitting: Place the fitting 32 into the cavity between the first clamping block 24 and the second clamping block 25;

[0056] Clamping operation: Manually push the quick clamp 29 to drive the inclined block 27 to move along the inclined surface of the fixed inclined block 28, push the movable seat 26 to move horizontally to the left, and drive the second clamping block 25 to move towards the first clamping block 24 to clamp the pipe fitting 32 step;

[0057] Placing the plate: Place plate 31 on top of pipe fitting 32;

[0058] Riveting execution: Start the hydraulic press, the upper die assembly 1 drives the punch 11 to press down, and the riveting is completed according to the program control height.

[0059] Release clamps and remove parts: Manually release quick clamp 29, drive inclined block 27 to move upward to release inclined surface constraint, return spring 22 pushes movable seat 26 to move to the right to reset, second clamping block 25 separates from first clamping block 24, and remove the riveted plate heat exchanger 3.

[0060] Key design effects

[0061] Clamping protection: The stepped surface of the pipe fitting 32 is clamped in full contact by the first clamping block 24 and the second clamping block 25 to avoid local deformation;

[0062] High-efficiency reset: The reset spring 22 automatically returns to the movable seat 26, shortening the part retrieval time;

[0063] Adjustable compatibility: The slide rail adjusts the position of the fixed inclined block 28 to adapt to the riveting requirements of different pipe diameters.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A riveting fixture for a plate heat exchanger (3), characterized in that: It includes an upper mold assembly (1) and a lower mold assembly (2) arranged opposite to each other, wherein the upper mold assembly (1) is movably disposed in a direction that is closer to or farther away from the lower mold assembly (2); A punch (11) is provided on the side of the upper die assembly (1) facing the lower die assembly (2); The lower mold assembly (2) is provided with a fixed seat (21) and a movable seat (26) on the side facing the upper mold assembly (1). The movable seat (26) is movably arranged in the direction of approaching or moving away from the fixed seat (21). A drive module for pushing the movable seat (26) is provided on the side of the movable seat (26) away from the fixed seat (21).

2. The riveting fixture for the plate heat exchanger (3) according to claim 1, characterized in that: The fixed seat (21) and the movable seat (26) are connected by a guide post (23).

3. The riveting fixture for the plate heat exchanger (3) according to claim 2, characterized in that: A return spring (22) is provided on the guide post (23).

4. The riveting fixture for the plate heat exchanger (3) according to claim 1, characterized in that: A first clamping block (24) is fixedly installed on the fixed seat (21), and a second clamping block (25) is fixedly installed on the movable seat (26). The parts of the plate heat exchanger (3) are clamped by the cooperation of the first clamping block (24) and the second clamping block (25).

5. The riveting fixture for the plate heat exchanger (3) according to claim 4, characterized in that: The fixing seat (21) is provided with a dovetail groove for fixing the first clamping block (24).

6. The riveting fixture for the plate heat exchanger (3) according to claim 4 or 5, characterized in that: The movable seat (26) is provided with a dovetail groove for fixing the second clamping block (25).

7. The riveting fixture for the plate heat exchanger (3) according to claim 1, characterized in that: The drive module includes a quick clamp (29) and a drive ramp (27) fixed at the end of the quick clamp (29); the lower mold assembly (2) is provided with a fixed ramp (28) that cooperates with the drive ramp (27). The fixed ramp (28) and the drive ramp (27) are provided with inclined surfaces with matching slopes. The push of the quick clamp (29) is converted into the movement of the movable seat (26) through the cooperation of the inclined surfaces.

8. The riveting fixture for the plate heat exchanger (3) according to claim 7, characterized in that: The pushing direction of the quick clamp (29) is perpendicular to the moving direction of the movable seat (26).

9. The riveting fixture for the plate heat exchanger (3) according to claim 7, characterized in that: The lower mold assembly (2) is provided with a slide rail, and the fixed inclined block (28) is set on the slide rail. The relative position of the fixed inclined block (28) and the movable seat (26) is adjusted by the slide rail.

10. The riveting fixture for the plate heat exchanger (3) according to claim 1, characterized in that: A guide rod is provided between the upper mold assembly (1) and the lower mold assembly (2).

Images