A cylinder device and working method for manual resistance spot welding pliers

Abstract

The present invention relates to a cylinder device and a working method for manual resistance spot welding pliers, the device comprising a first cylinder and a second cylinder; an inner cylinder assembly is installed in the second cylinder; the inner cylinder assembly comprises an inner cylinder, a second piston rod, an inner cylinder piston, a clamping structure, and an end cover assembly, a first gap is provided between the inner cylinder and the second cylinder, and the first gap forms a space for gas flow; an end cover assembly is installed at the opening of the inner cylinder, a fourth air channel is provided on the end cover assembly, a clamping structure is installed on the inner cylinder near the position of the end cover assembly; a fifth air channel is provided on the inner cylinder; when the end cover assembly is pressed against the bottom of the second cylinder, the clamping structure is sleeved on the inner cylinder piston; the present invention has a simple structure, improves the working safety and stability of the welding pliers, and has a smaller volume and weight.

Description

Technical Field

[0001] The invention belongs to the field of welding, and in particular relates to a power output device-a cylinder used on a manual resistance spot welding device and a working method thereof. Background Art

[0002] In the field of resistance welding technology, the cylinder-assisted stroke mainly used in the prior art generally does not have a mechanical locking block structure and has no locking function. During welding, the boom position may move due to factors such as the large mass of the boom and unstable gas source, resulting in unqualified welds. Summary of the invention

[0003] The present invention provides an auxiliary stroke device with a mechanical lock block structure, which is safer and more stable during operation. The technical solution for achieving the above purpose is as follows:

[0004] A cylinder device for manual resistance spot welding pliers comprises a first cylinder and a second cylinder, wherein the first cylinder is connected to the second cylinder;

[0005] An inner cylinder assembly is installed in the second cylinder; the inner cylinder assembly includes an inner cylinder, a second piston rod, an inner cylinder piston, a clamping structure, and an end cover assembly; an end cover assembly is installed at the tail opening of the inner cylinder, the end cover assembly seals the inner cylinder, and a clamping structure is installed on the inner cylinder near the end cover assembly;

[0006] The first piston rod passes through the first cylinder and is inserted into the inner cylinder piston. The first piston rod is fixedly connected to the inner cylinder and pushes the inner cylinder and the inner cylinder piston to move. The second piston rod passes through the second cylinder, the end cover assembly, and the clamp structure and is connected to the inner cylinder piston.

[0007] When the end cover assembly abuts against the bottom of the second cylinder, the clamping structure is sleeved on the inner cylinder piston.

[0008] Optionally, a first air channel is arranged in the axial direction of the first piston rod, and a second air channel and a third air channel are arranged on the first cylinder; the second air channel is connected with the first air channel; the third air channel is connected with the first cylinder barrel, a piston ring is sleeved on the first piston rod, and the piston ring moves with the first piston rod.

[0009] Optionally, a connecting block is provided between the first cylinder and the second cylinder; a fourth air channel and a fifth air channel are provided on the connecting block, the fourth air channel is connected to the second cylinder; and the fifth air channel is connected to the first cylinder.

[0010] Optionally, a sixth air passage is provided on the inner cylinder, a first gap is provided between the inner cylinder and the second cylinder, the first gap forms a gas flow space, and the sixth air passage is connected to the first gap.

[0011] Optionally, a seventh air passage is provided on the end cover assembly; a first plug hole is provided on the inner cylinder, the clamping structure is accommodated in the first plug hole, and the seventh air passage is connected to the first plug hole.

[0012] Optionally, an eighth air passage is provided at the bottom of the second cylinder, and the eighth air passage is communicated with the second cylinder.

[0013] Optionally, the structure includes two locking blocks, two plungers, and several springs; each locking block is provided with a second insertion hole, the plunger is inserted into the second insertion hole, and the second piston rod passes between the two locking blocks, wherein springs are installed between the locking blocks.

[0014] Optionally, the end cover assembly includes a first end cover; a one-way valve is installed on the first end cover.

[0015] Optionally, the one-way valve includes a pressure block and a plug; a plurality of sockets three are arranged on the first end cover, a pressure block is adapted to be installed in each socket three, an exhaust groove is arranged on the pressure block, and a plug is placed in the exhaust groove.

[0016] Optionally, one end of the first cylinder is an open structure, and a second end cover is installed on the opening; it also includes a protective cover, which is installed on the outside of the second end cover, and the first piston rod exposed outside the first cylinder is accommodated in the protective cover, and a second gap is provided between the protective cover and the first piston rod, and compressed air enters the first air channel along the second air channel and the second gap.

[0017] The working method of the device of the present invention is as follows:

[0018] (1) First, compressed air enters from the second air passage 11, and then enters the first air passage through the second gap. The compressed air pushes the inner cylinder piston forward, and the inner cylinder piston pushes the second piston rod to move.

[0019] (2) When the inner cylinder piston moves to the locking block position, the inner cylinder piston pushes up the locking block. At this time, compressed air flows into the plunger through the sixth air channel, pushing the plunger to drive the locking block to move toward the inner cylinder piston and clamp the inner cylinder piston. During welding, compressed air enters from the third and fourth air channels at the same time, pushing the first push rod and the inner cylinder to move forward together, completing the welding stroke action.

[0020] (3) After welding is completed, compressed air enters from the fifth air passage, pushing the piston ring to drive the first push rod and the inner cylinder barrel back together;

[0021] (4) Finally, compressed air enters from the eighth air channel, and the compressed air pushes the plunger through the seventh air channel. After the plunger is lifted, the compressed air enters the inner cylinder, pushing the inner cylinder piston back to the initial position, completing the auxiliary stroke action.

[0022] The invention has a simple structure, improves the working safety and stability of the welding clamp, and has a smaller overall volume and weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is the internal schematic diagram of the present invention;

[0025] Figure 2 This is an internal schematic diagram of another direction of the present invention;

[0026] Figure 3 It is a three-dimensional schematic diagram of the card structure;

[0027] Figure 4 It is an overall schematic diagram of the present invention;

[0028] Figure 5 It is a schematic diagram of a one-way valve of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure after the plunger of the present invention is lifted up;

[0030] Figure 7 This is a schematic diagram of the internal structure of the multi-stage supercharged cylinder of the present invention;

[0031] Figure 8 It is a welding process flow chart;

[0032] Fig. 9 for Figure 8 A partial enlarged view of

[0033] Fig.10 for Figure 8 A partial enlarged view of

[0034] Description of the numbers of the accompanying drawings: first cylinder 1, second air channel 11, third air channel 111, second end cover 12, second cylinder 2, inner cylinder 20, second piston rod 21, inner cylinder piston 22, sixth air channel 23, seventh air channel 24, eighth air channel 25, locking block 26, two plungers 27, several springs 28, first end cover 29, first piston rod 3, first air channel 31, piston ring 32, shaft retaining ring 4, sealing ring 5, buffer pad 6, limit block 7, connecting block 8, fourth air channel 81, fifth air channel 82, screw 9, screw 10, protective cover 13; DETAILED DESCRIPTION

[0035] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. At least one embodiment of the present invention provides the following technical solutions:

[0039] Figure 1-Figure 7 In the invention, a cylinder device for manual resistance spot welding pliers includes a first cylinder 1 and a second cylinder 2, wherein the first cylinder 1 is connected to the second cylinder 2; compressed air is transmitted to the second cylinder 2 through the first cylinder 1, and the compressed air can be provided by a high-pressure pump or a compression pump. Preferably, the first cylinder 1 is a booster cylinder for boosting.

[0040] An inner cylinder assembly is installed in the second cylinder 2; the inner cylinder assembly includes an inner cylinder 20, a second piston rod 21, an inner cylinder piston 22, a clamping structure, and an end cover assembly; an end cover assembly is installed at the tail opening of the inner cylinder 20, the end cover assembly seals the inner cylinder 20, and a clamping structure is installed on the inner cylinder 20 near the end cover assembly;

[0041] The first piston rod 3 passes through the first cylinder 1 and is movably inserted into the inner cylinder piston 22. At the same time, the first piston rod 3 is fixedly connected to the inner cylinder 20, and the first piston rod 3 pushes the inner cylinder 20 and the inner cylinder piston 22 to move; the second piston rod 3 passes through the second cylinder 2, the end cover assembly, and the clamping structure and is connected to the inner cylinder piston 22; when the end cover assembly is against the bottom of the second cylinder 2 (a position away from the first cylinder), the clamping structure is sleeved on the inner cylinder piston. The clamping structure clamps the inner cylinder piston 22 to prevent it from retreating or shaking during welding, thereby improving the quality of welding.

[0042] As an option, a first air passage 31 is provided in the axial direction of the first piston rod 3, and a second air passage 11 and a third air passage 111 are provided on the first cylinder; the second air passage 11 is communicated with the first air passage 31, and the third air passage 111 is communicated with the first cylinder 1. Compressed air enters the first air passage 31 through the second air passage 11, and the gas coming out of the first air passage 31 pushes the inner cylinder piston 22 to move, and the inner cylinder piston 22 drives the second piston rod 3 to move, which is used for welding;

[0043] The first piston rod 3 is sleeved with a piston ring 32, and compressed air enters the first cylinder 1 through the third air passage 111 to push the piston ring 32, and the piston ring 32 follows the first piston rod 3 to move back and forth along the first cylinder 1; both sides of the piston ring 32 can be fixed to the first piston rod 3 through a shaft retaining ring 4, and a sealing ring 5 is provided on the piston ring 32 to maintain the sealing performance between the piston ring 32 and the first cylinder 1;

[0044] As an option, one end of the first cylinder 1 is an open structure, a second end cover 12 is installed on the opening, and the second air channel 11 is arranged on the second end cover 12;

[0045] As a preferred method, a buffer pad 6 is installed between the piston ring 32 and the second end cover 12 to alleviate the impact of the piston ring 32 on the second end cover 12 when the piston ring 32 moves in the reverse direction;

[0046] As an option, a limit block 7, such as a locking nut, is installed at one end of the first piston rod 3 inserted into the inner cylinder piston 22, and the first piston rod 3 and the inner cylinder 20 are fixed together by the locking nut.

[0047] As an option, a connecting block 8 is provided between the first cylinder 1 and the second cylinder 2, and the connecting block 8 serves as a transition component between the first cylinder 1 and the second cylinder 2. At the same time, the connecting block 8 seals the openings of the first cylinder 1 and the second cylinder 2. Preferably, the first cylinder 1 and the second cylinder 2 are further fixedly connected by several screws 9; a fourth air channel 81 and a fifth air channel 82 are provided on the connecting block 8, and the fourth air channel 81 is connected to the interior of the second cylinder 2; the fifth air channel 82 is connected to the interior of the first cylinder 1.

[0048] The compressed air enters the first air passage 31 from the second air passage 11. The compressed air coming out of the first air passage 31 pushes the inner cylinder piston 22 to move. At the same time, the compressed air coming in from the third air passage 111 also pushes the piston ring 32 to move. The piston ring 32 moves synchronously with the first piston rod 3. The piston ring 32 pushes the compressed air inside the first cylinder 1 into the second cylinder 2 through the fourth air passage 81. The first piston rod 3 pushes the inner cylinder 20 to move forward.

[0049] Preferably, a buffer pad 6 is also provided between the inner cylinder 20 and the connecting block 8 to alleviate the impact force of the inner cylinder 20 on the connecting block 8, thereby indirectly reducing the buffer between the two cylinders.

[0050] As an option, a sixth air passage 23 is provided on the inner cylinder 20, a first gap is provided between the inner cylinder 20 and the second cylinder 2, the first gap forms a gas flow space, and the sixth air passage 23 is communicated with the first gap;

[0051] In the present invention, the seventh air passage 24 is provided on the end cover assembly; the inner cylinder 20 is provided with a first insertion hole, the clamping structure is accommodated in the first insertion hole, and the seventh air passage 24 is communicated with the first insertion hole.

[0052] An eighth air passage 25 is disposed at the bottom of the second cylinder 2 , and the eighth air passage 25 is communicated with the interior of the second cylinder 2 .

[0053] As an option, the clamp structure includes two locking blocks 26, two plungers 27, and several springs 28; each locking block 26 is provided with a second insertion hole, the bottom of the plunger 27 is adapted to be inserted into the second insertion hole, and the second piston rod 22 passes between the two locking blocks 26, wherein the spring 28 is installed between the two locking blocks 26, and when not working, the spring 28 is compressed by the locking block 26. Preferably, the second insertion hole is a screw hole, and the bottom of the plunger 27 is a threaded structure;

[0054] As a preferred embodiment, the first jack is a stepped structure, and the plunger 27 is a matching stepped structure. When the compressed air enters the second cylinder 2 from the eighth air passage 25, the compressed air pushes up the plunger 27 along the seventh air passage 24, so that the locking block 26 is separated from the inner cylinder piston 22, and the inner cylinder piston 22 can retreat with the second piston rod 21.

[0055] As an option, the end cover assembly includes a first end cover 29 , which is fastened to the bottom of the inner cylinder 20 by screws 10 ; a one-way valve is installed on the first end cover 29 .

[0056] like Figure 3 , Figure 5As shown, the one-way valve includes a pressure block 200 and a plug 201; a plurality of sockets 202 are provided on the first end cover 29, and a pressure block 200 is adapted to be installed in each socket 202. An exhaust groove is provided on the pressure block 200, and a plug 201 is placed in the exhaust groove. The plug 201 can be a steel ball.

[0057] The structure of the exhaust groove is preferably a stepped or conical structure, so that the steel ball is conveniently limited. The compressed air entering the inner cylinder 20 through the first air passage 31 pushes the steel ball in the pressing block 200, and the exhaust groove is opened, and the compressed air can be discharged from the exhaust groove. Conversely, when the air enters from the second cylinder 2, it pushes the steel ball to block the exhaust groove, so that the air cannot enter the inner cylinder 20, and the space of the inner cylinder 20 is kept sealed.

[0058] A sealing ring 5 is provided at the contact point between the first end cover 29 and the second piston rod 21 , and a sealing ring 5 is provided at the contact point between the first end cover 29 and the second cylinder barrel 2 to maintain the sealing performance of the space in the second cylinder barrel 2 .

[0059] As an option, a protective cover 13 is installed on the outer side of the second end cover 12, and the first piston rod 3 exposed outside the first cylinder is accommodated in the protective cover 13, and a second gap is provided between the protective cover 13 and the first piston rod 3, and the compressed air enters the first air passage 31 along the second air passage 11 and the second gap;

[0060] As another option, the free end of the second cylinder 2 is an open structure, and the third end cover 203 is installed on the opening. The eighth air duct 25 is arranged on the third end cover 203, and the guide seat 204 is installed on the third end cover 203. The inner hole of the guide seat 204 is respectively equipped with a dust ring 205, a sealing ring 5 and a guide sleeve 206 to avoid vibration during the movement of the second piston rod 22.

[0061] When a greater welding pressure is needed, only the pressure of the compressed air is increased without changing the cylinder barrel and inner cylinder barrel assembly structure, which brings convenience to the work.

[0062] The present invention can realize the connection of multi-stage cylinders, such as Figure 7 As shown, the multi-stage cylinder can increase the number of first cylinders to achieve a higher working pressure.

[0063] The working process of this device is described below:

[0064] The device has two strokes, namely an auxiliary stroke and a welding stroke. The auxiliary stroke controls the welding clamp to switch back and forth from the maximum opening stroke to the working stroke, and the welding stroke controls the welding clamp to switch back and forth from the working stroke to the welding clamp closing stroke.

[0065] During operation, the compressed air entering from the second air channel 11 enters the first air channel 31 through the second gap, and the compressed air simultaneously pushes the inner cylinder piston 22 to move forward, thereby pushing the second piston rod to move; when the inner cylinder piston 22 moves to the position of the locking block 26 and lifts the locking block 26, the compressed air flows into the plunger 27 through the sixth air channel 23, pushing the plunger 27 to drive the locking block 26 to move toward the inner cylinder piston 22, and jams the inner cylinder piston 22; during welding, compressed air enters from the third air channel 111 and the fourth air channel 81 at the same time, pushing the first push rod 3 and the inner cylinder 20 to move forward together, completing the welding stroke action.

[0066] After welding is completed, compressed air enters from the fifth air channel 82, pushing the piston ring 32 to drive the first push rod 3 and the inner cylinder 20 to return together. Finally, compressed air enters from the eighth air channel 25. After the compressed air pushes the plunger 27 up through the seventh air channel 24, it enters the inner cylinder 20, pushing the inner cylinder piston 22 back to the initial position, completing the auxiliary stroke action.

[0067] Figure 8-Figure 10 Flow chart of the welding process.

[0068] The above are only preferred embodiments of the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A cylinder device for manual resistance spot welding pliers, characterized in that: It comprises a first cylinder and a second cylinder, the first cylinder is connected to the second cylinder, a connecting block is arranged between the first cylinder and the second cylinder, the connecting block serves as a transition component between the first cylinder and the second cylinder, and the connecting block seals the opening between the first cylinder and the second cylinder; An inner cylinder assembly is installed in the second cylinder; the inner cylinder assembly includes an inner cylinder, a second piston rod, an inner cylinder piston, a clamping structure, and an end cover assembly; an end cover assembly is installed at the tail opening of the inner cylinder, the end cover assembly seals the inner cylinder, and a clamping structure is installed on the inner cylinder near the end cover assembly; The first piston rod passes through the first cylinder and the connecting block and then movably inserts into the inner cylinder piston. The first piston rod is fixedly connected to the inner cylinder at the same time. The first piston rod pushes the inner cylinder and the inner cylinder piston to move. The second piston rod passes through the second cylinder, the end cover assembly, and the clamping structure and then connects to the inner cylinder piston. When the end cover assembly abuts against the bottom of the second cylinder, the clamping structure is sleeved on the inner cylinder piston, and the clamping structure clamps the inner cylinder piston; The card structure includes two lock blocks, two plungers, and several springs; each lock block is provided with a second jack, the plunger is inserted into the second jack, and the second piston rod passes between the two lock blocks, wherein the spring is installed between the lock blocks; The end cover assembly includes a first end cover; a one-way valve is installed on the first end cover; the one-way valve includes a pressure block and a plug; a plurality of sockets three are provided on the first end cover, a pressure block is adapted to be installed in each socket three, an exhaust groove is provided on the pressure block, and a plug is placed in the exhaust groove.

2. The cylinder device for manual resistance spot welding pliers according to claim 1, characterized in that: A first air channel is arranged in the axial direction of the first piston rod, and a second air channel and a third air channel are arranged on the first cylinder; the second air channel is connected with the first air channel; the third air channel is connected with the first cylinder barrel, a piston ring is sleeved on the first piston rod, and the piston ring moves with the first piston rod.

3. The cylinder device for manual resistance spot welding pliers according to claim 2, characterized in that: A connecting block is arranged between the first cylinder and the second cylinder; a fourth air channel and a fifth air channel are arranged on the connecting block, the fourth air channel is communicated with the second cylinder; and the fifth air channel is communicated with the first cylinder.

4. The cylinder device for manual resistance spot welding pliers according to claim 3, characterized in that: The inner cylinder is provided with a sixth air passage, a first gap is provided between the inner cylinder and the second cylinder, the first gap forms a gas flow space, and the sixth air passage is communicated with the first gap.

5. The cylinder device for manual resistance spot welding pliers according to claim 4, characterized in that: The end cover assembly is provided with a seventh air passage; the inner cylinder is provided with a first plug hole, the clamping structure is accommodated in the first plug hole, and the seventh air passage is communicated with the first plug hole.

6. The cylinder device for manual resistance spot welding pliers according to claim 5, characterized in that: An eighth air passage is arranged at the bottom of the second cylinder, and the eighth air passage is communicated with the second cylinder.

7. The cylinder device for manual resistance spot welding pliers according to claim 6, characterized in that: One end of the first cylinder is an open structure, and a second end cover is installed on the opening; it also includes a protective cover, which is installed on the outside of the second end cover, and the first piston rod exposed outside the first cylinder is accommodated in the protective cover, and a second gap is provided between the protective cover and the first piston rod, and compressed air enters the first air channel along the second air channel and the second gap.

8. A method for operating a cylinder device for manual resistance spot welding tongs, characterized in that: A cylinder device for manual resistance spot welding pliers comprising claim 7; First, compressed air enters from the second air passage, and then enters the first air passage through the second gap, and the compressed air pushes the inner cylinder piston to move forward, and the inner cylinder piston pushes the second piston rod to move; When the inner cylinder piston moves to the locking block position, the inner cylinder piston pushes up the locking block. At this time, the compressed air flows into the plunger through the sixth air channel, pushing the plunger to drive the locking block to move toward the inner cylinder piston and clamp the inner cylinder piston. During welding, the compressed air enters from the third and fourth air channels at the same time, pushing the first push rod and the inner cylinder to move forward together, completing the welding stroke action. After welding is completed, compressed air enters from the fifth air channel, pushing the piston ring to drive the first push rod and the inner cylinder barrel back together; Finally, compressed air enters from the eighth air channel, and pushes the plunger through the seventh air channel. After the plunger is lifted, compressed air enters the inner cylinder, pushing the inner cylinder piston back to the initial position, completing the auxiliary stroke action.

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