Multi-station pre-tightening force clamp

Abstract

The utility model relates to the technical field of welding clamps, in particular to a multi-station pre-tightening force clamp which comprises a bottom plate, a plurality of sets of locking parts are installed on the top of the bottom plate, a sleeve which is located below the locking parts and is opposite to an external jacking device is fixed to the top of the bottom plate, and a plurality of positioning pins and a plurality of ball plungers are installed on the top of the sleeve. A positioning block connected with the positioning pin in a sleeving mode is arranged above the sleeve, and a jacking part extending into the positioning block is arranged in the sleeve. According to the multi-station pre-tightening force clamp, a product can be pre-clamped and fixed through the positioning block and the locking part, then the jacking part is driven by the external jacking assembly to jack up the product, and the positioning block synchronously jacks up under the action of the ball head plunger, so that the positioning block is attached to the product, the clamping firmness is improved, the stability during welding can be improved, and the welding quality is improved. Meanwhile, a plurality of groups of clamp bodies can be mounted on the bottom plate, so that a plurality of products can be machined at a time, the efficiency is improved, and the clamp is simple and compact in structure and convenient to maintain subsequently.

Description

Technical Field

[0001] The utility model relates to the technical field of welding fixtures, in particular to a multi-station pre-tightening force fixture. Background Art

[0002] Currently, a product on the market requires a certain preload during welding. The preload of the fixture is applied by gravity or an electric cylinder. The counterweight type preload uses a metal gravity block to press the workpiece under the action of gravity to achieve the purpose of preload. This method changes the size of the applied preload by changing the mass of the gravity block to meet the needs of different products.

[0003] There are many shortcomings in the design of gravity type preload clamp and electric cylinder type preload clamp:

[0004] Disadvantages of gravity type: 1. When the preload force needs to be large, the gravity block will be very heavy and it is difficult to carry it by manpower; 2. The structure is complex and occupies a large space. For welding in small spaces such as electron beam welding, vacuuming is required and the space is small, so this method is not applicable.

[0005] Disadvantages of the electric cylinder type: 1. It requires electrical control and has a complex structure, requiring electric cylinders and PLC control; 2. The efficiency is relatively low, and it takes a certain amount of time for the electric cylinder to apply pressure from small to large to reach the required preload force; 3. The electric cylinder needs to be installed, which takes up a relatively large space; 4. The fixture is damaged, and the repair is complicated, requiring professional maintenance. Utility Model Content

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multi-station preload clamp, comprising a base plate, a plurality of locking parts installed on the top of the base plate, and a sleeve fixed below the locking parts and opposite to the upper lifting device of the peripheral device, a plurality of positioning pins and a plurality of ball plungers installed on the top of the sleeve, a positioning block that is sleeved with the positioning pins is provided above the sleeve, and a lifting part extending into the positioning block is provided inside, a protrusion is formed on one side of the positioning block, and a product is placed between the protrusion and the positioning block.

[0007] Furthermore, the locking part includes multiple locking blocks and multiple supporting blocks fixed on the bottom plate surface, a cover plate is hinged between two supporting blocks, an L-shaped block is fixed on one side of the cover plate, and a buckle plate that can be buckled with the locking block is torsionally hinged on one side of the L-shaped block.

[0008] Furthermore, a concave surface is formed on one side of the L-shaped block, the gusset plate is located in the concave surface, and the gusset plate is F-shaped, with one protruding end being L-shaped.

[0009] Furthermore, the locking block is L-shaped, and a side block is formed on one side. The side of the side block on the upper right is an inclined surface, and the side of the other protruding end of the gusset plate on the lower left is an inclined surface.

[0010] Furthermore, a pressing block adapted to the top of the product is fixed to the bottom of the cover plate.

[0011] Furthermore, the lifting part includes a convex cylinder installed at the bottom of the sleeve, the interior of the sleeve is convex, and a linear bearing is provided between the maximum diameter of the inner side of the sleeve and the convex cylinder, the inner side of the linear bearing is sleeved with a push rod, and a limiting convex ring is provided at the middle of the push rod.

[0012] Furthermore, a shelf groove is provided at the center of the top of the positioning block, and a semicircular groove is provided at the top of the protrusion, and the product is placed between the shelf groove and the semicircular groove.

[0013] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0014] The multi-station preload force fixture can pre-clamp and fix the product through the positioning block and the locking part, and then drive the lifting part to lift the product through the external upper lifting component. The positioning block is synchronously pushed up under the action of the ball head plunger, so that the positioning block fits the product and improves the firmness of the clamping, thereby improving the stability during welding. At the same time, multiple groups can be installed on the base plate, so that multiple products can be processed at one time to improve efficiency. In addition, the fixture has a simple and compact structure, which is also convenient for subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a three-dimensional diagram of the cover plate connection structure in the utility model;

[0017] Figure 3 This is an exploded view of the sleeve connection structure in the present utility model;

[0018] Figure 4 It is a cross-sectional view of the sleeve in the present utility model.

[0019] In the figure: 1. Base plate; 2. Support block; 3. Locking block; 4. Cover plate; 5. L-shaped block; 6. Buckle plate; 7. Pressure block; 8. Sleeve; 9. Linear bearing; 10. Push rod; 11. Positioning block; 12. Positioning pin; 13. Bump; 14. Ball plunger; 15. Product. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-4 In this embodiment, a multi-station preload clamp includes a base plate 1 and twelve stations installed on the top of the base 1. The top of the base plate 1 is provided with a locking portion at each station. A sleeve 8 extending to the top of the base plate 1 is fixed at the station of the base plate 1. The sleeve 8 is located below the locking portion and between the sleeve 8 and the external lifting device. Two positioning pins 12 and four ball plungers 14 are installed on the top of the sleeve 8. A positioning block 11 is provided above the sleeve 8 and is sleeved with the positioning pins 12. A lifting portion opposite to the ejection end of the lifting device is provided on the inner side of the sleeve 8. The ejection end of the lifting portion is penetrated by the sleeve 8 and the positioning block 11. A protrusion 13 is formed on one side of the positioning block 11, and a product 15 is placed between the protrusion 13 and the positioning block 11.

[0022] In the above structure, the product is adapted by the protrusion and the positioning block, and the product is limited at the same time, and then the product is pressed and positioned with the positioning block through the locking part, thereby realizing the effect of pre-positioning, which can prevent the product from shifting after placement. During pre-compression, the positioning block will squeeze the ball plunger, and the ball plunger will play a buffering role. When the product is lifted by the external lifting device, the product and the locking part are tightly attached to improve the firmness of the fixation, and the product is stopped when a certain pre-tightening force is applied to it. When lifting the product, the ball plunger will also push the positioning block up to fit the product, thereby improving stability.

[0023] The center of the top of the positioning block 11 is provided with a resting groove, and the top of the protruding block 13 is provided with a semicircular groove, and the product 15 is placed between the resting groove and the semicircular groove. The resting groove on the positioning block and the semicircular groove on the protruding block can place and limit the specified product shape.

[0024] like Figure 2As shown, in order to play the role of pre-stressing, the locking part includes a locking block 3 fixed to the surface of the bottom plate 1 at the work station and two supporting blocks 2 distributed opposite to the locking block 3. A cover plate 4 is torsionally hinged between the two supporting blocks 2. The right side of the bottom of the cover plate 4 is in contact with the locking block 3. An L-shaped block 5 is fixed to the right side of the cover plate 4. The right side of the L-shaped block 5 is torsionally hinged with a gusset plate 6 that can be buckled with the locking block 3. When the cover is opened, the gusset plate is separated from the locking block. When the product is placed on the positioning block, the cover is released and the gusset plate is opened at the same time. When the cover is in contact with the locking block, the gusset plate is lowered and the gusset plate is buckled with the locking block, so that the cover pre-stresses the product. The top of the cover is provided with a welding hole for easy welding operation.

[0025] The right side of the L-shaped block 5 is formed with a concave surface, and the gusset plate 6 is torsionally hinged in the concave surface. The gusset plate 6 is F-shaped, and the protruding end in the middle is L-shaped. With the protruding end in the middle of the gusset plate located in the concave surface, the horizontal end of the protruding end in the middle can contact the concave surface to play a limiting role. At the same time, one side of the vertical end of the protruding end in the middle can provide space for the gusset plate to move and limit the angle of movement of the gusset plate. Therefore, it can prevent the gusset plate from tilting too much when opening, and can always keep the gusset plate vertically downward in a natural state.

[0026] In addition, the locking block 3 has a rectangular bottom and an L-shaped top. A side block is formed on the right side of the locking block 3. The side block has an inclined surface on the upper right side, and the other protruding end of the gusset plate 6 has an inclined surface on the lower left side. In its natural state, the gusset plate is vertically downward. When the cover plate is fastened, the inclined surface of the gusset plate will push the gusset plate apart through the inclined surface of the locking block until the protruding end of the gusset plate is located below the side block. The gusset plate is then fastened to the locking block under the torsional force, completing the locking operation.

[0027] At the same time, a pressing block 7 adapted to the top of the product 15 is fixed by screws to the bottom of the cover plate 4 on the side opposite to the center of the positioning block 11. The contact between the pressing block and the product can reduce damage to the cover plate, increase the pressing force, and facilitate replacement of the pressing block.

[0028] like Figure 3-4 The lifting part includes a convex cylinder installed at the bottom of the sleeve 8. The interior of the sleeve 8 is convex, and a linear bearing 9 is provided between the maximum diameter of the inner side of the sleeve 8 and the convex cylinder. A push rod 10 is sleeved on the inner side of the linear bearing 9. The middle part of the push rod 10 is located at the top of the linear bearing 9 to form a limit convex ring. The push rod is pushed upward by an external lifting device. The push rod extends to the top of the positioning block, thereby lifting the product upward. When the product reaches a certain preload force, the ball plunger will also push the positioning block upward to fit the product to improve stability. When the external lifting device retracts, the push rod falls freely until the limit convex ring comes into contact with the linear bearing and stops.

[0029] The working principle of the above embodiment is:

[0030] By installing the locking part, sleeve and lifting part on the twelve workstations of the base plate, first open the locking part, and put the product into the positioning block. The positioning block and the protrusion can adapt to the product, thereby playing the role of supporting and limiting the product. At the same time, the product's own weight will press the ball plunger down through the positioning block, and under the action of the ball plunger, it acts as a buffer. Loosen the locking part, the cover plate returns to its position, and the inclined surface of the buckle plate connects with the inclined surface of the locking block. Then press the cover plate to squeeze the buckle plate and the locking block to tilt. The locking block will squeeze the buckle plate to a certain angle, and then fasten the buckle plate and the locking block, so that the pressure block is close to the product, which plays the role of limiting and pressing the upper part of the product. Then the external lifting device pushes the push rod upward, and the push rod pushes the product so that the product stops after reaching a certain preload force. At the same time, the ball plunger will also drive the positioning block to move upward, so that the positioning block will drag the product to improve the stability of the product's later welding.

[0031] In summary, the preload clamp can realize multi-station operation, so that multiple products can be fixed and welded at one time, improving efficiency. At the same time, the structure of the clamp is simple and compact, which can reduce space waste and facilitate subsequent maintenance.

[0032] The entire workflow is complete, and all contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0033] It should be noted that in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-station preload clamp, characterized by: The invention comprises a base plate (1), the top of which is provided with a plurality of locking parts, and a sleeve (8) fixedly located below the locking parts and opposite to an external lifting device, the top of the sleeve (8) is provided with a plurality of positioning pins (12) and a plurality of ball plungers (14), the top of the sleeve (8) is provided with a positioning block (11) sleeved with the positioning pins (12), and a lifting part extending into the positioning block (11) is provided inside, a protrusion (13) is formed on one side of the positioning block (11), and a product (15) is placed between the protrusion (13) and the positioning block (11).

2. The multi-station preload clamp according to claim 1, characterized in that: The locking portion comprises a plurality of locking blocks (3) and a plurality of supporting blocks (2) fixed on the surface of the base plate (1); a cover plate (4) is hinged between two supporting blocks (2); an L-shaped block (5) is fixed to one side of the cover plate (4); and a buckle plate (6) capable of buckling with the locking block (3) is torsionally hinged to one side of the L-shaped block (5).

3. The multi-station preload clamp according to claim 2, characterized in that: A concave surface is formed on one side of the L-shaped block (5), and the gusset plate (6) is located in the concave surface. The gusset plate (6) is F-shaped, and one of the protruding ends is L-shaped.

4. The multi-station preload clamp according to claim 3, characterized in that: The locking block (3) is L-shaped, and a side block is formed on one side. The side of the side block on the upper right side is an inclined surface, and the side of the other protruding end of the buckle plate (6) on the lower left side is an inclined surface.

5. The multi-station preload clamp according to claim 4, characterized in that: A pressing block (7) adapted to the top of the product (15) is fixed to the bottom of the cover plate (4).

6. The multi-station preload clamp according to claim 1, characterized in that: The lifting portion comprises a convex cylinder installed at the bottom of a sleeve (8); the interior of the sleeve (8) is in a convex shape; a linear bearing (9) is provided between the maximum diameter of the inner side of the sleeve (8) and the convex cylinder; a push rod (10) is sleeved on the inner side of the linear bearing (9); and a limiting convex ring is provided at the middle of the push rod (10).

7. The multi-station preload clamp according to claim 1, characterized in that: A shelf groove is provided at the center of the top of the positioning block (11), a semicircular groove is provided at the top of the protrusion (13), and the product (15) is placed between the shelf groove and the semicircular groove.

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