Overload concession seat and concession method suitable for hot shearing bar righting clamp

Abstract

The invention discloses an overload concession seat suitable for a hot shearing bar straightening clamp and a concession method. The concession seat comprises a fixed connecting plate, a first mounting plate, a connecting rod mechanism, a second mounting plate, a balance mechanism, a counter-pull positioning mechanism and a supporting plate. The bottom plate is fixedly arranged on the side edge of the lower die base. The first mounting plate is arranged on the fixed connecting plate and is hinged with one end of the connecting rod mechanism; the other end of the link mechanism is hinged to the second mounting plate; the balance mechanism comprises a balance spring, and two ends of the balance spring are respectively connected with the first mounting plate and the second mounting plate; the counter-pulling positioning mechanism comprises an air cylinder, and the two ends of the air cylinder are hinged to the first mounting plate and the second mounting plate correspondingly. When the receding seat works, a flattened bar is extruded to push the centralizing clamp to move, the thrust of the receding seat is far greater than the specified reverse tension provided by the air cylinder, so that the connecting rod mechanism is pushed to generate a backward and downward arc-shaped moving track, the displacement distance of the connecting rod mechanism is greater than the flattened and extruded length of the bar, and the centralizing clamp and the pushing device are ensured not to be damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of fastening equipment, and more specifically, relates to an overload retreat seat and retreat method suitable for a hot shear bar straightening fixture. Background Art

[0002] In the die forging field of the forging industry, in order to reduce production costs and improve efficiency, manufacturers generally use large-tonnage shears to cut round steel to a fixed length for bars with a diameter of less than 50; and for bars with a diameter of more than 50, a long round steel is heated in a furnace and then cut to a fixed length with a shear. Regardless of the above cold shearing or hot shearing methods, the end face of the billet after shearing will not be perpendicular to the axis, or even bent and deformed. Because the ends of the hot-sheared bars are not neat planes, such bars cannot be stably placed in the die like sawed bars. A straightening fixture must be used to clamp the bars vertically so that the bars can be released in time when the press hits them.

[0003] In an automatic production line at a certain production site, the straightening fixture sometimes fails to straighten due to a malfunction, causing the skewed bar to be flattened and stretched by the die, and the straightening clamp is damaged (see attached Figures 1 to 3 ). Although this situation occurs occasionally, once it occurs, it will affect the normal operation of the entire production line and increase the workload of repairing the righting fixture.

[0004] Therefore, at this stage, an overload retreat seat suitable for hot shear bar straightening fixture is continuously developed, which can effectively prevent the bar from being flattened and stretched by the die and damaging the straightening fixture. Summary of the invention

[0005] In view of the problem in the prior art that the rod is flattened and stretched by the die and the straightening clamp is damaged, the present invention provides an overload retreat seat and retreat method suitable for a hot shear rod straightening clamp to solve such problem.

[0006] To achieve the above-mentioned purpose, the present invention provides an overload retreat seat suitable for a hot shear bar straightening fixture, comprising a bottom plate fixedly arranged on the side of a lower die seat; a first mounting plate fixedly arranged on a fixed connecting plate, which is hinged to one end of a connecting rod mechanism; a second mounting plate hinged to the other end of the connecting rod mechanism, a support plate being vertically fixedly arranged on the top of the second mounting plate; a straightening fixture and a pushing device are fixedly arranged on the top of the support plate; and a balancing mechanism and a reverse pulling positioning mechanism, wherein the balancing mechanism comprises a balancing spring, whose two ends are respectively connected to the first mounting plate and the second mounting plate; the reverse pulling positioning mechanism comprises a cylinder, whose two ends are respectively hinged to the first mounting plate and the second mounting plate, which provides a specified reverse pulling force to the second mounting plate through a telescopic piston rod, so that the retreat seat does not shake in the initial position; the tilted bar is flattened and stretched to push the straightening fixture to move, and its thrust is much greater than the specified reverse pulling force provided by the cylinder, thereby pushing the connecting rod mechanism to produce a backward and downward arc-shaped moving trajectory, and its displacement distance is greater than the flattened and stretched length of the bar, thereby ensuring that the straightening fixture and the pushing device will not be damaged.

[0007] Furthermore, the linkage mechanism is a parallel four-bar structure, including a first linkage group and a second linkage group arranged in parallel, each linkage group including two linkages; the first linkage group and the second linkage group contact each other to limit the forward movement of the second mounting plate, so that the second mounting plate remains in a vertical state and the retreat seat is stably stopped in an initial position.

[0008] Further, the lower ends of the first connecting rod group are respectively hinged to the first shaft rod, and the two ends of the first shaft rod are respectively fixedly connected to the first shaft rod fixing seat, and the first shaft rod fixing seat is fixedly arranged on the rear side of the first mounting plate; the upper ends of the first connecting rod group are respectively hinged to the third shaft rod, and the two ends of the third shaft rod are respectively fixedly connected to the third shaft rod fixing seat, and the third shaft rod fixing seat is fixedly arranged on the front side of the second mounting plate; the lower ends of the second connecting rod group are respectively hinged to the second shaft rod, and the two ends of the second shaft rod are respectively fixedly connected to the second shaft rod fixing seat, and the second shaft rod fixing seat is fixedly arranged on the rear side of the first mounting plate, and is located parallel to and above the first shaft rod fixing seat; the upper ends of the second connecting rod group are respectively hinged to the fourth shaft rod, and the two ends of the fourth shaft rod are respectively fixedly connected to the fourth shaft fixing seat, and the fourth shaft fixing seat is fixedly arranged on the front side of the second mounting plate, and is located parallel to and above the first shaft fixing seat.

[0009] Furthermore, a cylinder through hole is opened in the middle of the second mounting plate for passing the cylinder, and spring through holes are symmetrically arranged on both sides of the cylinder through hole for passing the balance spring.

[0010] Furthermore, the reverse pull positioning mechanism also includes a pull rod, a cylinder hinge seat, a cylinder base and a pull rod hinge seat.

[0011] Furthermore, the cylinder base is vertically fixed at the rear end of the second mounting plate, directly below the cylinder through hole; the cylinder hinge seat is fixed at the top of the cylinder base, and is hinged to the bottom of the cylinder; the front end of the pull rod cylinder passes through the cylinder through hole, and its piston rod is fixedly connected to the rear end of the pull rod through a coupling; the front end of the pull rod is hinged to the pull rod hinge seat; the pull rod hinge seat is fixed on the rear side of the first mounting plate.

[0012] Furthermore, the balancing mechanism includes a balancing spring, a first spring fixing plate, a first spring fixing pile, a second spring fixing plate and a second spring fixing pile; the first spring fixing plate is vertically fixed with two groups on the rear side of the first mounting plate, and is symmetrically located on both sides of the pull rod hinge seat; the first spring fixing pile is vertically fixed on the outside of the first spring fixing plate; the second spring fixing plate is vertically fixed with two groups on the rear side of the first mounting plate, and is symmetrically located on both sides of the cylinder through hole; the second spring fixing pile is vertically fixed on the outside of the second spring fixing plate; one end of the balancing spring is fixedly connected to the first spring fixing pile, and the other end passes through the spring through hole and is fixedly connected to the second spring fixing pile.

[0013] Furthermore, the bottom plate is made of a whole steel plate, with first oblong holes at its four corners and two groups of weight-reducing holes in the middle; positioning holes are also provided on both sides of the weight-reducing holes on the bottom plate.

[0014] Furthermore, a second oblong hole is provided on the first mounting plate, and a bolt passes through the second oblong hole and is threadedly connected to the positioning hole, and is precisely adjusted and positioned, so that the first mounting plate is firmly fixed to the base plate.

[0015] According to another aspect of the present invention, there is also provided an overload retreat method applicable to a hot shear bar straightening fixture, comprising the following steps:

[0016] S100: The cylinder pulls the pull rod to generate a forward specified reverse pulling force, so that the second mounting plate remains in a vertical state;

[0017] S200: The first connecting rod assembly and the second connecting rod assembly rotate forward until they are in contact with each other to limit the position, so that the retreat seat is kept at the initial position without shaking;

[0018] S300: The tilted bar is flattened and stretched, which generates an impact load that pushes the straightening fixture to move backward;

[0019] S400: The impact load is much greater than the specified reverse pulling force provided by the cylinder, so that the cylinder piston rod extends and pushes the second mounting plate to move backward;

[0020] S500: The connecting rod mechanism generates an arc-shaped moving trajectory backward and downward, and its effective displacement distance is greater than the length of the bar being flattened and extended;

[0021] S600: The straightening fixture and the pusher are pushed open by the bar material to avoid damage;

[0022] S700: The staff takes out the flattened bar and removes the load on the straightening fixture and the pusher;

[0023] S800: The balance spring releases elastic potential energy and cooperates with the cylinder to push the second mounting plate back to its original position until the first connecting rod group and the second connecting rod group contact each other to limit the position, so that the retreat seat stops stably at the initial position.

[0024] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0025] 1. The retreat seat of the present invention is provided with a connecting rod mechanism, and its backward displacement distance is greater than the length of the rod being flattened and extended, thereby ensuring that the straightening clamp and the pushing device will not be damaged; by providing a reverse pulling positioning mechanism, it prevents the second mounting plate from moving backward through a fixed reverse pulling force, thereby keeping the second mounting plate in the initial position without shaking, and at the same time, because the specified reverse pulling force generated by the cylinder is greater than the motion load of the anti-straightening clamp and the pushing device during operation, the anti-straightening clamp and the pushing device on the top of the support plate will not shake during operation, thereby ensuring the smooth operation of both; when the tilted rod is flattened and extended, and the thrust generated exceeds the specified reverse pulling force provided by the cylinder, the retreat seat generates a backward and downward arc-shaped moving trajectory through the connecting rod mechanism, thereby ensuring that the straightening clamp and the pushing device will not be damaged.

[0026] 2. The retreat seat of the present invention is provided with a balancing mechanism, which can buffer and absorb the vertical force generated by the operation of the righting clamp and the pushing device under the action of the elastic potential energy of the balancing spring, thereby ensuring the stability of the operation of the righting clamp and the pushing device; it can automatically reset after the external load is removed, thereby ensuring the stable use and reusability of the retreat seat.

[0027] 3. The retreat seat of the present invention can effectively protect the straightening clamp and the pushing device when the bar is flattened. It has a stable structure and low overall cost. It does not require changes to the mold base and is easy to install, so it has a high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the operation of a straightening fixture straightening a bar in the prior art;

[0029] Figure 2 It is a schematic diagram of the state of the bar after being skewed in the prior art;

[0030] Figure 3 It is a schematic diagram of a state in which a skewed bar is flattened and stretched by a die and the straightening clamp is broken in the prior art;

[0031] Figure 4 It is a structural schematic diagram of an overload retreat seat suitable for a hot shear bar straightening fixture in an embodiment of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the reverse pull positioning mechanism in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the bottom plate in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the front structure of the first mounting plate in an embodiment of the present invention;

[0035] Figure 8 Schematic diagram of the rear structure of the first mounting plate in an embodiment of the present invention;

[0036] Fig. 9 This is a schematic diagram of the front structure of the second mounting plate in an embodiment of the present invention;

[0037] Fig.10 is a schematic diagram of the rear structure of the second mounting plate in an embodiment of the present invention;

[0038] Fig.11 This is a schematic diagram of the state in which the overload concession seat is in the initial position in an embodiment of the present invention;

[0039] Fig.12 This is a schematic diagram of the state of the overloaded yielding seat in the yielding operation in an embodiment of the present invention;

[0040] Fig.13 The present invention is a flowchart of an overload retreat method suitable for a hot shear bar straightening fixture in an embodiment of the present invention.

[0041] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-bottom plate, 101-weight reduction hole, 102-positioning hole, 103-first oblong hole, 2-first mounting plate, 201-second oblong hole, 3-connecting rod mechanism, 301-first connecting rod group, 302-second connecting rod group, 303-first shaft rod, 304-first shaft rod fixing seat, 305-second shaft rod, 306-second shaft rod fixing seat, 307-third shaft rod, 308-third shaft rod fixing seat, 309 -The fourth axis rod, 310-the fourth axis rod fixing seat, 4-the second mounting plate, 401-the cylinder through hole, 402-the spring through hole, 5-the balancing mechanism, 501-the balancing spring, 502-the first spring fixing plate, 503-the first spring fixing pile, 504-the second spring fixing plate, 505-the second spring fixing pile, 6-the reverse pulling positioning mechanism, 601-the cylinder, 602-the pull rod, 603-the cylinder hinge seat, 604-the cylinder base, 605-the pull rod hinge seat, 7-the support plate, 8-the reinforcement plate. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] like Figure 1-10 As shown, the present invention provides an overload retreat seat suitable for a hot shear bar straightening fixture, which includes a fixed connecting plate 1, a first mounting plate 2, a connecting rod mechanism 3, a second mounting plate 4, a balancing mechanism 5, a reverse pull positioning mechanism 6 and a support plate 7. The bottom plate 1 is fixedly arranged on the side of the lower die seat to transmit the load of the retreat seat to the lower die seat. The first mounting plate 2 is fixedly mounted on the fixed connecting plate 1, and is hinged to one end of the connecting rod mechanism 3; the connecting rod mechanism 3 is a parallel four-link structure, and the other end is hinged to the second mounting plate 4; the balancing mechanism 5 includes a balancing spring 501, whose two ends are respectively connected to the first mounting plate 2 and the second mounting plate 4, and is used to balance the vertical force of the connecting rod mechanism 3 and the straightening clamp and the pushing device, so that the retreat seat automatically resets after the external load is unloaded; the reverse pull positioning mechanism 6 includes a cylinder 601, whose two ends are respectively hinged to the first mounting plate 2 and the second mounting plate 4, and provides a specified reverse pulling force to the second mounting plate 4 through a telescopic piston rod, so that the retreat seat does not shake in the initial position, so as to resist the motion load when the straightening clamp and the pushing device are in operation. The support plate 7 is fixedly mounted on the top of the second mounting plate 4, and is used to install the straightening clamp and the pushing device. When the retreat seat of the present invention is in operation, the tilted bar is flattened and stretched to push the straightening fixture to move, and its thrust is much greater than the specified reverse pulling force provided by the cylinder 601, thereby pushing the connecting rod mechanism 3 to produce a backward and downward arc-shaped moving trajectory, and its displacement distance is greater than the length of the bar being flattened and stretched, thereby ensuring that the straightening fixture and the pushing device will not be damaged.

[0044] like Figure 4-6 As shown, the bottom plate 1 is made of a whole steel plate, and the first oblong holes 103 are opened at the four corners. Bolts are passed through the first oblong holes 103, and the positioning is precisely adjusted to firmly fix the bottom plate 1 to the front side of the lower die seat. The bottom plate 1 fixedly connected to the lower die seat can transmit the external load on the retreat seat to the lower die seat, ensuring the stable use of the retreat seat. Two groups of weight-reducing holes 101 are also provided in the middle of the bottom plate 1, which reduce the overall weight of the bottom plate 1 while ensuring the overall structural strength, so that it can be more firmly fixed to the front side of the lower die seat. Positioning holes 102 are also provided on the bottom plate 1, which are located on both sides of the weight-reducing holes 101 and are used to position and fix the first mounting plate 2.

[0045] like Figure 7-8As shown, the first mounting plate 2 is used to install the connecting rod mechanism 3, the balancing mechanism 5 and the reverse pulling positioning mechanism 6, and is provided with a second oblong hole 201. Bolts pass through the second oblong hole 201 and are threadedly connected to the positioning hole 102, and are precisely adjusted and positioned, so that the first mounting plate 2 is firmly fixed on the base plate 1.

[0046] The connecting rod mechanism 3 includes a first connecting rod group 301 and a second connecting rod group 302 arranged in parallel, and each connecting rod group includes two connecting rods. The lower end of the first connecting rod group 301 is respectively hinged to the first shaft rod 303, and the two ends of the first shaft rod 303 are respectively fixedly connected to the first shaft rod fixing seat 304, and the first shaft rod fixing seat 304 is fixedly arranged at the rear side of the first mounting plate 2; the upper end of the first connecting rod group 301 is respectively hinged to the third shaft rod 307, and the two ends of the third shaft rod 307 are respectively fixedly connected to the third shaft rod fixing seat 308, and the third shaft rod fixing seat 308 is fixedly arranged at the front side of the second mounting plate 4. The lower ends of the second connecting rod group 302 are respectively hinged to the second shaft rod 305, and the two ends of the second shaft rod 305 are respectively fixedly connected to the second shaft rod fixing seat 306. The second shaft rod fixing seat 306 is fixedly arranged on the rear side of the first mounting plate 2, and is located parallel to and above the first shaft rod fixing seat 304; the upper ends of the second connecting rod group 302 are respectively hinged to the fourth shaft rod 309, and the two ends of the fourth shaft rod 309 are respectively fixedly connected to the fourth shaft rod fixing seat 310. The fourth shaft rod fixing seat 310 is fixedly arranged on the front side of the second mounting plate 4, and is located parallel to and above the first shaft rod fixing seat 304.

[0047] In the embodiment of the present invention, the two ends of the connecting rod mechanism 3 are respectively hinged to the first mounting plate 2 and the second mounting plate 4, so that the second mounting plate 4 can rotate around the first mounting plate 2 to produce an arc-shaped moving trajectory backward and downward, and its backward displacement distance is greater than the length of the rod being flattened and stretched, thereby ensuring that the straightening clamp and the pushing device will not be damaged.

[0048] like Figure 9-10 As shown, a cylinder through hole 401 is opened in the middle of the second mounting plate 4 for passing the cylinder 601 , and spring through holes 402 are symmetrically provided on both sides of the cylinder through hole 401 for passing the balance spring 501 .

[0049] The support plate 7 is horizontally arranged and vertically fixed on the top of the second mounting plate 4, and is used to install and fix the straightening fixture and the pushing device. When the rod material is flattened and elongated to push the straightening fixture to move, the impact load is transmitted to the support plate 7, pushing the support plate 7 to move backward under the action of the connecting rod mechanism 4, thereby preventing the rod material from crushing and damaging the straightening fixture.

[0050] Furthermore, in order to enhance the connection strength between the support plate 7 and the second mounting plate 4, a reinforcing plate 8 is fixedly provided between the support plate 7 and the second mounting plate 4. Two groups of reinforcing plates 8 are provided, which are respectively located at the two ends of the bottom of the support plate 7. The reinforcing plate 8 is an L-shaped structure, one end of which is vertically fixedly connected to the bottom of the support plate 7, and the other end is fixedly connected to the front end of the second mounting plate 4, thereby greatly improving the connection strength between the support plate 7 and the second mounting plate 4, and preventing the impact load of the rod flattening from being transmitted to the support plate 7, causing it to break at the connection with the second mounting plate 4.

[0051] like Figure 4-5 As shown, the reverse-pull positioning mechanism 6 includes a cylinder 601, a pull rod 602, a cylinder hinge 603, a cylinder base 604 and a pull rod hinge 605; the cylinder base 604 is vertically fixed at the rear end of the second mounting plate 4, directly below the cylinder through hole 401; the cylinder hinge 603 is fixed at the top of the cylinder base 604, and is hinged to the bottom of the cylinder 601; the front end of the pull rod cylinder 601 passes through the cylinder through hole 401, and its piston rod is fixedly connected to the rear end of the pull rod 602 through a coupling; the front end of the pull rod 602 is hinged to the pull rod hinge 605; the pull rod hinge 605 is fixed to the rear side of the first mounting plate 2.

[0052] In the embodiment of the present invention, the cylinder 601 pulls the pull rod 602 through the telescopic piston rod to generate a specified forward reverse pulling force, so that the second mounting plate 4 remains in a vertical state. At this time, the first connecting rod group 301 and the second connecting rod group 302 are in contact to block the second mounting plate 4 from moving forward. The cylinder 601 prevents the second mounting plate 4 from moving backward through the specified reverse pulling force, thereby keeping the second mounting plate 4 in the initial position without shaking. At the same time, since the specified reverse pulling force generated by the cylinder 601 is greater than the motion load of the anti-straightening clamp and the pushing device during operation, the anti-straightening clamp and the pushing device on the top of the support plate 7 do not shake during operation, thereby ensuring the smooth operation of both.

[0053] In the embodiment of the present invention, the tilted bar is flattened and stretched to push the straightening clamp to move, and its thrust is much greater than the specified reverse pulling force provided by the cylinder 601, so that the piston rod of the cylinder 601 extends, pushing the second mounting plate 4 to move backward, and moves backward and downward under the action of the connecting rod mechanism 3, thereby preventing the bar from crushing and damaging the straightening clamp; in this process, the stretched length of the piston rod of the cylinder 601 is less than the piston protection stroke, thereby avoiding damage to the piston and the rod body; after removing the external load, the internal air pressure of the cylinder 601 pushes the piston to return to its original state, thereby pushing the second mounting plate 4 to move forward to the initial position, and providing a specified reverse pulling force to ensure that the anti-straightening clamp and the pushing device on the top of the support plate 7 do not shake during operation.

[0054] like Figure 4-5As shown in Figures 8 and 10, in the embodiment of the present invention, the balancing mechanism 5 is used to balance the vertical force of the connecting rod mechanism 3, the straightening fixture and the pusher device, to ensure that the connecting rod mechanism 3 can rotate smoothly, and to automatically reset after the external load is removed and the seat is retreated. It includes a balancing spring 501, a first spring fixing plate 502, a first spring fixing pile 503, a second spring fixing plate 504 and a second spring fixing pile 505. The first spring fixing plate 502 is vertically fixed with two groups at the rear side of the first mounting plate 2, and is symmetrically located on both sides of the pull rod hinge seat 605; the first spring fixing pile 503 is vertically fixed on the outside of the first spring fixing plate 502; the second spring fixing plate 504 is vertically fixed with two groups at the rear side of the first mounting plate 2, and is symmetrically located on both sides of the cylinder through hole 401; the second spring fixing pile 505 is vertically fixed on the outside of the second spring fixing plate 504; one end of the balancing spring 501 is fixedly connected to the first spring fixing pile 503, and the other end passes through the spring through hole 402 and is fixedly connected to the second spring fixing pile 505.

[0055] By providing a balancing mechanism 5, the vertical force component generated during the operation of the straightening clamp and the pushing device can be buffered and absorbed under the action of the elastic potential energy of the balancing spring 501, thereby ensuring the stability of the operation of the straightening clamp and the pushing device; when the rod material is flattened and stretched to push the straightening clamp to move, the balancing spring 501 converts the impact load into elastic potential energy by stretching, and generates a certain resistance to the rotation of the connecting rod mechanism 3, so that the connecting rod mechanism 3 can rotate smoothly, and avoids the instantaneous transmission of the impact load that causes the connecting rod mechanism 3 to turn and stop suddenly, thereby extending the service life of the retreat seat; after the impact load is removed, the balancing spring 501 releases the elastic potential energy, and cooperates with the cylinder 601 to push the second mounting plate 4 to reset until the first connecting rod group 301 and the second connecting rod group 302 contact each other to limit, so that the retreat seat stops stably at the initial position.

[0056] like Figure 11-12As shown, when the retreat seat of the present invention is in operation, the cylinder 601 pulls the pull rod 602 through the telescopic piston rod to generate a specified reverse pulling force forward, so that the second mounting plate 4 is kept in a vertical state, and the first connecting rod group 301 and the second connecting rod group 302 are in contact to limit the position, thereby blocking and limiting the retreat seat from rotating forward, and the cylinder 601 blocks and limits the retreat seat from rotating backward through the specified reverse pulling force, thereby keeping the retreat seat in the initial position without shaking; because the specified reverse pulling force generated by the cylinder 601 is greater than the motion load of the anti-straightening clamp and the pushing device during operation, the anti-straightening clamp and the pushing device on the top of the support plate 7 do not shake during operation, ensuring the smooth operation of both. Industry; the tilted bar is flattened and stretched, and the impact load it generates pushes the straightening fixture to move backward. The thrust is much greater than the specified reverse pulling force provided by the cylinder 601, so that the piston rod of the cylinder 601 extends, pushing the second mounting plate 4 to move backward, and the connecting rod mechanism 3 produces an arc-shaped moving trajectory backward and downward, and its displacement distance is greater than the length of the bar being flattened and stretched, thereby ensuring that the straightening fixture and the pushing device will not be damaged; after the impact load is removed, the balance spring 501 releases its elastic potential energy, and cooperates with the cylinder 601 to push the second mounting plate 4 to reset until the first connecting rod group 301 and the second connecting rod group 302 contact each other for limiting, so that the retreat seat stably stops at the initial position.

[0057] In one embodiment of the present invention, the high-temperature bar delivered by the robot enters the center of the mold in a vertical posture, the straightening clamp mounted on the top of the retreat seat clamps the bar, the press die presses the bar, the clamping claws of the straightening clamp automatically move away, and the push-pull device is actuated to push out the formed forging; in this process, because the action force of the straightening clamp and the action force of the pushing device are both smaller than the counter-pull force of the cylinder 601, the initial position of the connecting rod mechanism 3 will not be changed; once the bar delivered by the robot is not delivered to the center of the mold in a vertical posture, or the straightening clamp itself fails, causing the bar to tilt on the mold, the press at this time presses the bar, which will flatten the middle section of the bar and extend it by 20-30m. m; and if the rod material that has been elongated and deformed by the press happens to face the straightening clamp or the pushing device, it will push the straightening clamp to move. The force of the elongation and deformation is much greater than the 40-50 kg provided by the cylinder 601, and the first connecting rod group 301 and the second connecting rod group 302 will rotate with their respective ends as the center of the circle, and the straightening clamp and the pushing device will produce an arc-shaped moving trajectory to the right and downward; the connecting rod mechanism 3 drives the support plate 7 to move with a maximum range of movement of 40 mm horizontally to the right, and a maximum range of movement of 40 mm vertically downward, and the elongated size of the rod material is less than 30 mm, which is less than the maximum retreat size of 40 mm, thereby ensuring that the straightening clamp will not be damaged.

[0058] The retreat seat of the present invention is provided with a connecting rod mechanism 3, and its backward displacement distance is greater than the length of the rod being flattened and stretched, thereby ensuring that the straightening clamp and the pushing device will not be damaged; by providing a reverse pulling positioning mechanism 6, it prevents the second mounting plate 4 from moving backward through a fixed reverse pulling force, thereby keeping the second mounting plate 4 in the initial position without shaking, and at the same time, because the specified reverse pulling force generated by the cylinder 601 is greater than the motion load of the anti-straightening clamp and the pushing device during operation, the anti-straightening clamp and the pushing device on the top of the support plate 7 do not shake during operation, thereby ensuring the smooth operation of both; when the tilted rod is flattened and stretched, and the thrust generated exceeds the specified reverse pulling force provided by the cylinder 601, the retreat seat generates a backward and downward arc-shaped moving trajectory through the connecting rod mechanism 4, effectively ensuring that the straightening clamp and the pushing device will not be damaged.

[0059] The retreat seat of the present invention is provided with a balancing mechanism 5, which can buffer and absorb the vertical force generated by the operation of the straightening clamp and the pushing device under the action of the elastic potential energy of the balancing spring 501, thereby ensuring the stability of the operation of the straightening clamp and the pushing device; it can automatically reset after the external load is removed, ensuring the stable use and reusability of the retreat seat.

[0060] The retreat seat of the present invention can effectively protect the straightening clamp and the material pushing device when the bar is flattened, has a stable structure, low overall cost, does not require modification of the die base, is easy to install, and has high promotion value.

[0061] The present invention also provides an overload retreat method applicable to a hot shear bar straightening fixture, comprising the following steps:

[0062] S100: The cylinder 601 pulls the pull rod 602 to generate a forward specified reverse pulling force, so that the second mounting plate 4 remains in a vertical state;

[0063] S200: The first link assembly 301 and the second link assembly 302 rotate forward until they contact each other to limit the position, so that the retreat seat is kept at the initial position without shaking;

[0064] S300: The tilted bar is flattened and stretched, which generates an impact load that pushes the straightening fixture to move backward;

[0065] S400: The impact load is much greater than the specified reverse pulling force provided by the cylinder 601, so that the piston rod of the cylinder 601 extends and pushes the second mounting plate 4 to move backward;

[0066] S500: the connecting rod mechanism 3 generates an arc-shaped moving trajectory backward and downward, and its effective displacement distance is greater than the length of the rod being flattened and extended;

[0067] S600: The straightening fixture and the pusher are pushed open by the bar material to avoid damage;

[0068] S700: The staff takes out the flattened bar and removes the load on the straightening fixture and the pusher;

[0069] S800: The balance spring 501 releases its elastic potential energy and cooperates with the cylinder 601 to push the second mounting plate 4 to reset until the first connecting rod assembly 301 and the second connecting rod assembly 302 contact each other to limit the position, so that the retreat seat stops stably at the initial position.

[0070] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An overload retreat seat suitable for a hot shear bar straightening fixture, characterized in that: include: A bottom plate (1) fixedly arranged on the side of the lower die seat; A first mounting plate (2) fixedly mounted on the fixed connecting plate (1) and hingedly connected to one end of the connecting rod mechanism (3); A second mounting plate (4) is hinged to the other end of the connecting rod mechanism (3), and a support plate (7) is vertically fixed on the top thereof; a straightening clamp and a material pushing device are fixedly installed on the top of the support plate (7); and a balancing mechanism (5) and a reverse pulling positioning mechanism (6), wherein the balancing mechanism (5) comprises a balancing spring (501), two ends of which are respectively connected to the first mounting plate (2) and the second mounting plate (4); the reverse pulling positioning mechanism (6) comprises a cylinder (601), two ends of which are respectively hinged to the first mounting plate (2) and the second mounting plate (4), and the cylinder provides a specified reverse pulling force to the second mounting plate (4) through a telescopic piston rod, so that the retreat seat does not shake in the initial position; The tilted bar is flattened and stretched to push the straightening fixture to move, and its thrust is greater than the specified reverse pulling force provided by the cylinder (601), thereby pushing the connecting rod mechanism (3) to produce an arc-shaped moving trajectory backward and downward, and its displacement distance is greater than the length of the bar being flattened and stretched, thereby ensuring that the straightening fixture and the pushing device will not be damaged.

2. The overload retreat seat suitable for the hot shear bar straightening fixture according to claim 1, characterized in that: The connecting rod mechanism (3) is a parallel four-bar structure, comprising a first connecting rod group (301) and a second connecting rod group (302) arranged in parallel, each connecting rod group comprising two connecting rods; the first connecting rod group (301) and the second connecting rod group (302) are in contact with each other to restrict the second mounting plate (4) from moving forward, so that the second mounting plate (4) remains in a vertical state, and the retreat seat is stably stopped at an initial position.

3. The overload retreat seat suitable for the hot shear bar straightening fixture according to claim 2, characterized in that: The lower ends of the first connecting rod group (301) are respectively hinged to the first shaft rod (303), and the two ends of the first shaft rod (303) are respectively fixedly connected to the first shaft rod fixing seat (304), and the first shaft rod fixing seat (304) is fixedly arranged on the rear side of the first mounting plate (2); the upper ends of the first connecting rod group (301) are respectively hinged to the third shaft rod (307), and the two ends of the third shaft rod (307) are respectively fixedly connected to the third shaft rod fixing seat (308), and the third shaft rod fixing seat (308) is fixedly arranged on the front side of the second mounting plate (4); the lower ends of the second connecting rod group (302) are respectively hinged to the second shaft rod (307), and the two ends of the third shaft rod (307) are respectively fixedly connected to the third shaft rod fixing seat (308), and the third shaft rod fixing seat (308) is fixedly arranged on the front side of the second mounting plate (4); The shaft rod (305) is hinged, and the two ends of the second shaft rod (305) are respectively fixedly connected to the second shaft rod fixing seat (306), and the second shaft rod fixing seat (306) is fixedly arranged on the rear side of the first mounting plate (2), and is located parallel to and above the first shaft rod fixing seat (304); the upper ends of the second connecting rod group (302) are respectively hinged to the fourth shaft rod (309), and the two ends of the fourth shaft rod (309) are respectively fixedly connected to the fourth shaft rod fixing seat (310), and the fourth shaft rod fixing seat (310) is fixedly arranged on the front side of the second mounting plate (4), and is located parallel to and above the first shaft rod fixing seat (304).

4. An overload retreat seat suitable for a hot shear bar straightening fixture according to any one of claims 1 to 3, characterized in that: A cylinder through hole (401) is provided in the middle of the second mounting plate (4) for passing the cylinder (601), and spring through holes (402) are symmetrically provided on both sides of the cylinder through hole (401) for passing the balance spring (501).

5. The overload retreat seat suitable for the hot shear bar straightening fixture according to claim 4 is characterized in that: The reverse-pull positioning mechanism (6) also includes a pull rod (602), a cylinder hinge seat (603), a cylinder base (604) and a pull rod hinge seat (605).

6. The overload retreat seat suitable for the hot shear bar straightening fixture according to claim 5 is characterized in that: The cylinder base (604) is vertically fixed to the rear end of the second mounting plate (4) and is located directly below the cylinder through hole (401); the cylinder hinge seat (603) is fixed to the top of the cylinder base (604) and is hinged to the bottom of the cylinder (601); the front end of the pull rod cylinder (601) passes through the cylinder through hole (401), and its piston rod is fixedly connected to the rear end of the pull rod (602) through a coupling; the front end of the pull rod (602) is hinged to the pull rod hinge seat (605); the pull rod hinge seat (605) is fixed to the rear side of the first mounting plate (2).

7. The overload retreat seat suitable for the hot shear bar straightening fixture according to claim 4 is characterized in that: The balancing mechanism (5) comprises a balancing spring (501), a first spring fixing plate (502), a first spring fixing pile (503), a second spring fixing plate (504) and a second spring fixing pile (505); two groups of the first spring fixing plate (502) are vertically fixed on the rear side of the first mounting plate (2), and are symmetrically located on both sides of the pull rod hinge seat (605); the first spring fixing pile (503) is vertically fixed on the outside of the first spring fixing plate (502); two groups of the second spring fixing plate (504) are vertically fixed on the rear side of the first mounting plate (2), and are symmetrically located on both sides of the cylinder through hole (401); the second spring fixing pile (505) is vertically fixed on the outside of the second spring fixing plate (504); one end of the balancing spring (501) is fixedly connected to the first spring fixing pile (503), and the other end passes through the spring through hole (402) and is fixedly connected to the second spring fixing pile (505).

8. An overload retreat seat suitable for a hot shear bar straightening fixture according to any one of claims 1 to 3, characterized in that: The bottom plate (1) is made of a whole steel plate, with first oblong holes (103) opened at its four corners and two groups of weight-reducing holes (101) arranged in the middle; positioning holes (102) are also arranged on both sides of the weight-reducing holes (101) on the bottom plate (1).

9. An overload retreat seat suitable for a hot shear bar straightening fixture according to claim 8, characterized in that: The first mounting plate (2) is provided with a second oblong hole (201), which is threadedly connected to the positioning hole (102) through a bolt passing through the second oblong hole (201) and accurately adjusted and positioned, thereby firmly fixing the first mounting plate (2) on the base plate (1).

10. An overload retreat method for a hot shear bar straightening fixture, characterized in that: The steps include: S100: The cylinder (601) pulls the pull rod (602) to generate a forward designated reverse pulling force, thereby keeping the second mounting plate (4) in a vertical state; S200: The first connecting rod assembly (301) and the second connecting rod assembly (302) rotate forward until they are in contact with each other to limit the position, so that the retreat seat is kept in the initial position without shaking; S300: The tilted bar is flattened and stretched, which generates an impact load that pushes the straightening fixture to move backward; S400: The impact load is much greater than the specified reverse pulling force provided by the cylinder (601), so that the piston rod of the cylinder (601) extends and pushes the second mounting plate (4) to move backward; S500: the connecting rod mechanism (3) generates an arc-shaped moving trajectory moving backward and downward, and its effective displacement distance is greater than the length of the rod being flattened and extended; S600: The straightening fixture and the pusher are pushed open by the bar material to avoid damage; S700: The staff takes out the flattened bar and removes the load on the straightening fixture and the pusher; S800: The balance spring (501) releases elastic potential energy and cooperates with the cylinder (601) to push the second mounting plate (4) to reset until the first connecting rod group (301) and the second connecting rod group (302) contact each other to limit the position, so that the retreat seat stops stably at the initial position.

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