Clamping force control system of tail clamp

Abstract

The utility model provides a tail clamping device clamping force control system which comprises an air cylinder arranged on a tail clamping device so as to control opening or closing of a roll collar on the tail clamping device, and the interior of the air cylinder is divided into a rod cavity and a rodless cavity by a piston; the first air source is connected with the rod cavity through a first pipeline, the second air source is connected with the rodless cavity through a second pipeline, and control valves are arranged on the first pipeline and the second pipeline; wherein the air pressure provided by the first air source is greater than that provided by the second air source. According to the control system, the clamping force of the tail clamping device can be dynamically switched, so that the tail clamping device can provide different clamping forces in different working states.

Description

Technical Field

[0001] The utility model relates to the technical field of bar rolling equipment, in particular to a clamping force control system for a tail clamp which can dynamically switch the clamping force of the tail clamp. Background Art

[0002] High-speed bar rolling has a fast speed, good product appearance quality, high yield rate and other advantages, but its braking problem has always been a technical difficulty in this setting. The existing technology uses the tail clamp as a braking device on the high-speed bar production line, which is set between the double-length flying shear and the rotating hub. It can not only convey the rolled piece clamped by the roller ring forward before the double-length flying shear shears the high-speed rolled piece, but also provide reaction force braking for the high-speed rolled piece (usually greater than 40m / s) after the double-length flying shear shears the rolled piece, so that its speed drops to the required speed (usually around 5m / s).

[0003] When the tail clamp is in braking action, the braking acceleration reaches -40m / s 2 , which is 4 times the acceleration of gravity. The braking force is provided by the friction force formed by the clamping force between the roller ring and the rolled piece. The clamping force is provided by the cylinder pressure, and the clamping force acts on the supporting bearing of the roller ring. When the tail clamp plays a clamping role, it mainly overcomes the resistance of the rolled piece in the guide groove. The clamping force is about 10% of the braking force value. Therefore, the clamping force required for clamping is 10% of the clamping force required for tail clamping braking.

[0004] In the prior art, an air source is usually used to control the extension and retraction of the cylinder, thereby driving the roller ring to open or close, wherein the clamping force of the roller ring to close the steel depends on the cylinder pressure. However, the existing control system for controlling the cylinder has the following disadvantages:

[0005] 1. The system pressure is set according to the pressure required for the tail clamp brake, which causes excessive pressure in the clamping mode, resulting in a relatively short life of the tail clamp and roller ring.

[0006] 2. When the roller gap opens and closes, the load is large, which will have a certain impact on the equipment and reduce the reliability of the equipment.

[0007] 3. The rodless chamber of the cylinder is always supplied with air at a constant pressure, which causes a certain waste of resources. Utility Model Content

[0008] The utility model aims to provide a clamping force control system for a tail clamp, which can realize dynamic switching of the clamping force of the tail clamp so that the tail clamp can provide different clamping forces under different working conditions.

[0009] The utility model provides a clamping force control system for a tail clamp, which comprises:

[0010] A cylinder, which is arranged on the tail clamp to control the opening or closing of the roller ring on the tail clamp, and the interior of the cylinder is divided into a rod chamber and a rodless chamber by a piston;

[0011] a first gas source and a second gas source, wherein the first gas source is connected to the rod chamber via a first pipeline, and the second gas source is connected to the rodless chamber via a second pipeline, and control valves are provided on the first pipeline and the second pipeline;

[0012] Wherein, the air pressure provided by the first air source is greater than the air pressure provided by the second air source.

[0013] The clamping force control system of the tail clamp described in the utility model can switch the connection state of the first pipeline and the second pipeline under the control of the control valve, thereby realizing the switching of the cylinder between different states, ensuring that during the clamping and conveying process before the rolled piece is cut off, the piston rod of the cylinder can provide a smaller driving force, and during the braking process after the rolled piece is cut off, the piston rod of the cylinder can provide a larger driving force.

[0014] During the clamping process before the workpiece is cut, the driving force provided by the cylinder to the ring roller is relatively small, so the clamping force of the ring roller on the workpiece is relatively small, thereby reducing the wear of the workpiece on the ring roller, extending the service life of the roller ring and the roll replacement cycle, reducing operating costs and improving operating efficiency.

[0015] The rodless chamber of the cylinder is supplied with air through a low-pressure air source, the opening of the roller gap is powered by the second air source (low pressure), and the closing of the roller gap is powered by the pressure difference between the first air source and the second air source (relatively low pressure), thereby reducing the impact when the roller gap opens and closes and improving the reliability of the equipment.

[0016] In a preferred embodiment of the present utility model, the control valve includes a first solenoid valve arranged on the first pipeline, the first solenoid valve has an air inlet, a ventilation port and an exhaust port, the first air source is connected to the air inlet of the first solenoid valve, the rod chamber is connected to the ventilation port of the first solenoid valve, the first solenoid valve has a charging position and a pressure relief position, when the first solenoid valve is in the charging position, the air inlet is connected to the ventilation port, and the exhaust port is closed, when the first solenoid valve is in the pressure relief position, the air inlet is closed, and the ventilation port is connected to the exhaust port.

[0017] In this embodiment, a control method is provided for controlling the connectivity state of the first pipeline through a two-position three-way solenoid valve, and switching between the connection between the rod chamber and the atmosphere or the connection with the first gas source is achieved through electrical control. The control method is relatively simple and easy to implement automatic control.

[0018] In a preferred embodiment of the present utility model, the control valve also includes a second solenoid valve arranged on the second pipeline, the structure of the second solenoid valve is the same as that of the first solenoid valve, the second air source is connected to the air inlet of the second solenoid valve, and the rodless chamber is connected to the air exchange port of the second solenoid valve.

[0019] In this embodiment, a control method is provided for controlling the connection state of the second pipeline through a two-position three-way solenoid valve, and switching between the connection between the rodless chamber and the atmosphere or the connection with the second gas source is achieved through electrical control. The control method is relatively simple and easy to realize automatic control.

[0020] In a preferred embodiment of the present invention, the exhaust port of the first solenoid valve and the exhaust port of the second solenoid valve are both connected to an exhaust pipe communicating with the atmosphere, and a muffler is provided on the exhaust pipe.

[0021] In this embodiment, the exhaust pipe connected to the exhaust port of the solenoid valve can facilitate the exhaust of gas in the rod cavity or the rodless cavity, and the muffler arranged on the exhaust pipe can reduce the noise during the exhaust process.

[0022] In a preferred embodiment of the utility model, the control system also includes a control unit, which is respectively connected to the first solenoid valve and the second solenoid to control them to switch between different working positions; when the tail clamp is in an open state, the first solenoid valve is in a pressure relief position, and the second solenoid valve is in a pressure charging position; when the tail clamp is in a closed clamping state, the first solenoid valve and the second solenoid valve are both in a pressure charging position; when the tail clamp is in a closed braking state, the first solenoid valve is in a pressure charging position, and the second solenoid valve is in a pressure relief position.

[0023] In this embodiment, the control unit can control the first solenoid valve and the second solenoid valve according to the current state of the rolled piece. The control unit is electrically connected to the front cutting mechanism to switch between the clamping, clamping and braking states of the rolled piece according to the cutting timing of the rolled piece, thereby realizing the automation of the rolling of the rolled piece.

[0024] In a preferred embodiment of the present invention, both the first pipeline and the second pipeline are provided with an oil mist generator.

[0025] In this embodiment, the oil mist device can provide lubrication for the first solenoid valve, the second solenoid valve and the piston in the cylinder to avoid an increase in the sliding resistance of the valve core and the piston after long-term operation.

[0026] In a preferred embodiment of the present invention, the first gas source and the second gas source are connected to a total gas source through pipelines, respectively, and pressure reducing valves are provided on the pipelines between the total gas source and the first gas source and the second gas source.

[0027] In this embodiment, the total gas source provides a stable gas pressure, and two pressure reducing valves are used to form a first gas source and a second gas source with different pressures, thereby avoiding the need to set up two parallel stable gas sources, and the cost is relatively low. At the same time, the pressure of the gas provided by the first gas source and the second gas source can be appropriately adjusted according to the actual operation requirements.

[0028] In a preferred embodiment of the present invention, both the first gas source and the second gas source are provided with gas tanks, and the gas outlets of the gas tanks are connected to the first pipeline or the second pipeline.

[0029] In this embodiment, the internal volume of the gas tank is much larger than the internal volume of the gas cylinder, which can ensure the stability of the pressure supply of the first gas source and the second gas source.

[0030] In a preferred embodiment of the present invention, a pressure gauge is provided on the gas tank.

[0031] In this embodiment, the pressure gauge can monitor in real time the gas pressure that can be provided by the first gas source and the second gas source, making it convenient for the staff to monitor the entire gas pressure control circuit.

[0032] In a preferred embodiment of the present invention, a drain valve is provided at the bottom end of the gas tank.

[0033] In this embodiment, impurities in the gas tank can be discharged through the drain valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0036] Figure 1 It is a structural schematic diagram of the tail clamp;

[0037] Figure 2 This is a schematic diagram of the connection structure of the clamping force control system of the tail clamp described in the utility model;

[0038] Figure 3 It is a schematic diagram of the cylinder of the utility model in a first state;

[0039] Figure 4 It is a schematic diagram of the cylinder of the utility model in the second state;

[0040] Figure 5 This is a schematic diagram of the cylinder of the utility model in the third state.

[0041] Description of Figure Numbers:

[0042] 01. Cylinder; 02. Upper swing seat; 03. Upper roller shaft; 04. Upper swing shaft; 05. Connecting rod; 06. Connecting plate; 07. Lower swing shaft; 08. Lower roller shaft; 09. Lower swing seat; 10. Box;

[0043] 20. Rod chamber; 21. Rodless chamber; 22. Piston; 23. Piston rod;

[0044] 30. first gas source; 31. first pipeline;

[0045] 40. Second gas source; 41. Second pipeline;

[0046] 50, first solenoid valve; 51, charging position; 52, pressure relief position;

[0047] 60. Second solenoid valve; 61. Charging position; 62. Pressure relief position;

[0048] 70. Total gas source; 71. Air release pipe; 72. Muffler; 73. Oil mist collector; 74. Pressure reducing valve; 75. Gas tank; 76. Pressure gauge; 77. Safety valve; 78. Drain valve;

[0049] 80. Ball valve; 81. Filter;

[0050] P, air inlet; A, ventilation port; R, exhaust port. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the technical solutions in the present invention, 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 should fall within the scope of protection of the present invention.

[0052] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0054] In order to explain the working principle of the clamping force control system of the tail clamp described in the utility model, the structure of the tail clamp is briefly introduced first. Figure 1 As shown, it shows the structural schematic diagram of the tail clamp.

[0055] The tail clamp mainly includes an upper roller shaft 03 and a lower roller shaft 08 which can be close to each other, and ring rollers are arranged on the upper roller shaft 03 and the lower roller shaft 08, wherein the upper roller shaft 03 is installed on the upper swing seat 02 through a bearing, and a roller ring is installed on it, the axis center of the upper swing shaft 04 is fixed (positioned on the box body 10 through a bearing), and the upper swing seat 02 can swing up and down around the upper swing shaft 04; the lower roller shaft 08 is installed on the lower swing seat 09 through a bearing, and a roller ring is installed on it, the axis center of the lower swing shaft 07 is fixed (positioned on the box body 10 through a bearing), and the lower swing seat 09 swings up and down around the lower swing shaft 07; the lower end of the connecting rod 05 of the cylinder 01 is hinged to the lower swing seat 09, and the upper end of the connecting rod 05 of the cylinder 01 is connected to the piston rod 23 of the cylinder 01; the connecting plate 06 is hinged to the upper swing seat 02 and the lower swing seat 09 to make them open and close symmetrically.

[0056] When the piston rod of cylinder 01 extends, the upper swing seat 02 swings upward, and the lower swing seat 09 swings downward, and the roll gap opens; when the piston rod of cylinder 01 retracts, the upper swing seat 02 swings downward, and the lower swing seat 09 swings upward, and the roll gap closes, forming a roller ring that clamps the workpiece.

[0057] Secondly, the shearing and conveying process of the rolled piece is briefly introduced: Assuming that the distance from the double-length shear (cutting mechanism) to the tail clamp is L1, starting from the rolled piece after double-length shearing, the rolled piece moves at a rolling speed V1, travels a distance L1, and lasts for t1=L1 / V1. The head of the rolled piece reaches the tail clamp (at this time, the roll gap is in an open state). At this time, the system controls the piston rod of cylinder 01 to retract, the roll gap closes to clamp the rolled piece, and the steel is fed forward; the rolled piece travels a double-length length L D When the double-length shear is used for segmented shearing, the length of the workpiece clamped by the tail clamp is L2 = L D -L1, duration t2=L2 / V1; after multiple-length shearing, the tail clamp immediately decelerates and brakes, reducing the speed to V2. At this time, the remaining length from the tail of the rolled piece to the tail clamp is L4, the rolled piece braking process travels L3=L1-L4, the braking time t3=L3 / ((V1+V2) / 2), the acceleration of the rolled piece a=(V2-V1) / t3; the rolled piece travels a distance of L4 at a low and steady speed of V2, and the low-speed travel time t4=L4 / V2 before throwing the steel (the steel tail leaves the tail clamp); after the rolled piece leaves the tail clamp, the system controls the piston rod of cylinder 01 to extend, the roll gap opens, and prepares to receive the next rolled piece.

[0058] When the tail clamp is in braking action, the braking acceleration can reach -40m / s 2 , which is 4 times the acceleration of gravity. The braking force is provided by the friction force formed by the clamping force between the roller ring and the rolled piece. The clamping force is provided by the pressure of the cylinder 01, and the clamping force acts on the supporting bearing of the roller ring. When the tail clamp plays a clamping role, it mainly overcomes the resistance of the rolled piece in the guide groove. The clamping force value is about 10% of the braking force value. Therefore, the clamping force required for clamping is 10% of the clamping force required for the tail clamp brake. In actual production, according to the fixed length L D =99m, braking distance L2 = 27m, clamping distance L2 = L D -L1=99-27=72m, so reducing the clamping force during the clamping process can effectively reduce the equipment load.

[0059] like Figures 2 to 5As shown, the utility model provides a clamping force control system for a tail clamp, which includes: a cylinder 01, which is arranged on the tail clamp to control the opening or closing of the roller ring on the tail clamp, and the interior of the cylinder 01 is divided into a rod chamber 20 and a rodless chamber 21 by a piston 22; a first air source 30 and a second air source 40, the first air source 30 is connected to the rod chamber 20 through a first pipeline 31, and the second air source 40 is connected to the rodless chamber 21 through a second pipeline 41, and control valves are provided on the first pipeline 31 and the second pipeline 41; wherein the air pressure provided by the first air source 30 is greater than the air pressure provided by the second air source 40.

[0060] The clamping force control system of the tail clamp described in the utility model can switch the connection state of the first pipeline 31 and the second pipeline 41 under the control of the control valve, thereby realizing the switching of the cylinder 01 between different states, ensuring that during the clamping and conveying process before the rolled piece is cut, the piston rod 23 of the cylinder 01 can provide a smaller driving force, and during the braking process after the rolled piece is cut, the piston rod 23 of the cylinder 01 can provide a larger driving force.

[0061] During the clamping process before the workpiece is cut, the driving force provided by cylinder 01 to the ring roller is relatively small, so the clamping force of the ring roller on the workpiece is also relatively small, thereby reducing the wear of the workpiece on the ring roller, extending the service life of the roller ring and the roll replacement cycle, reducing operating costs and improving operating efficiency.

[0062] The rodless chamber 21 of the cylinder 01 is supplied with air by a low-pressure air source (the second air source 40). The opening of the roller gap is powered by the second air source 40 (low pressure), and the closing of the roller gap is powered by the pressure difference (relative low pressure) between the first air source 30 and the second air source 40, thereby reducing the impact when the roller gap opens and closes and improving the reliability of the equipment.

[0063] Specifically, Figure 2 As shown, the inner cavity of the cylinder 01 is divided into a rod cavity 20 and a rodless cavity 21 by a piston 22. A piston rod 23 is connected to the piston 22. As the piston 22 moves in the cylinder, the piston rod 23 can extend or retract. The control valves arranged on the first pipeline 31 and the second pipeline 41 can control the connection state between the first pipeline 31 and the second pipeline 41 and the outside, thereby controlling the extension or retraction of the piston rod 23; the first gas source 30 can provide a relatively stable gas pressure P1, and the second gas source 40 can provide a relatively stable gas pressure P2, wherein P1 is greater than P2.

[0064] Furthermore, in actual operation, when the control valve controls the first pipeline 31 to be disconnected and the second pipeline 41 to be connected, the rod chamber 20 of the cylinder 01 is connected to the atmosphere, and the rodless chamber 21 of the cylinder 01 is connected to the second air source 40. At this time, under the action of the air pressure P2 provided by the second air source 40, the piston rod 23 extends and the roller gap opens; when the roller gap opens, the driving force (thrust) generated by the air pressure P2 provided by the second air source 40 is relatively small, and the impact force generated is also relatively small.

[0065] When the control valve controls the first pipeline 31 and the second pipeline 41 to be open, the rod chamber 20 of the cylinder 01 is connected to the first air source 30, and the rodless chamber 21 of the cylinder 01 is connected to the second air source 40. At this time, under the action of the pressure difference between the air pressure P1 provided by the first air source 30 and the air pressure P2 provided by the second air source 40, the piston rod 23 retracts and the roller gap closes; when the roller gap is closed, the thrust generated by the pressure difference (P1-P2) between the first air source 30 and the second air source 40 is relatively small, and the impact force generated is also relatively small. At this time, the piston rod 23 of the cylinder 01 can provide a relatively low driving force (pulling force), and accordingly, the clamping force generated after the roller gap is closed is relatively small, which can be used to clamp the rolled piece.

[0066] When the control valve controls the first pipeline 31 to open and the second pipeline 41 to disconnect, the rodless chamber 21 of the cylinder 01 is connected to the atmosphere, and the rod chamber 20 of the cylinder 01 is connected to the first gas source 30. At this time, under the action of the air pressure P1 provided by the first gas source 30, the piston rod 23 remains in a retracted state, but because the piston 22 is only affected by the air pressure P1 provided by the first gas source 30 in one direction, the piston rod 23 of the cylinder 01 can provide a relatively high driving force (pulling force). Accordingly, the clamping force generated in the closed roll gap state is relatively large, which can be used to brake the rolled piece.

[0067] Furthermore, in the prior art, in order to brake the sheared rolled piece, two parallel channels are usually provided on the tail clamp (that is, two sets of upper rollers 03 and lower rollers 08 are provided). Figure 2 In the embodiment shown, two parallel cylinders 01 are provided to control the opening and closing of the roller gaps in the two channels. Of course, the number of cylinders 01 needs to be set according to the specific structure of the tail clamp, and it is not limited to one cylinder. Figure 2 The two shown are limited.

[0068] According to one embodiment of the present utility model, Figure 2As shown, the control valve includes a first solenoid valve 50 arranged on the first pipeline 31, the first solenoid valve 50 has an air inlet P, a ventilation port A and an exhaust port R, the first air source 30 is connected to the air inlet P of the first solenoid valve 50, the rod chamber 20 is connected to the ventilation port A of the first solenoid valve 50, the first solenoid valve 50 has a charging position 51 and a pressure relief position 52, when the first solenoid valve 50 is in the charging position 51, the air inlet P is connected to the ventilation port A, and the exhaust port R is closed, when the first solenoid valve 50 is in the pressure relief position 52, the air inlet P is closed, and the ventilation port A is connected to the exhaust port R.

[0069] In this embodiment, a control method is provided for controlling the connectivity state of the first pipeline 31 through a two-position three-way solenoid valve, and switching between the connection of the rod chamber 20 with the atmosphere or with the first gas source 30 is achieved through electrical control. The control method is relatively simple and easy to realize automatic control.

[0070] Further, such as Figure 2 As shown, the control valve also includes a second solenoid valve 60 arranged on the second pipeline 41. The structure of the second solenoid valve 60 is the same as that of the first solenoid valve 50. The second air source 40 is connected to the air inlet P of the second solenoid valve 60, and the rodless chamber 21 is connected to the air exchange port A of the second solenoid valve 60.

[0071] In this embodiment, a control method is provided for controlling the connectivity state of the second pipeline 41 through a two-position three-way solenoid valve, and switching between the connection of the rodless chamber 21 with the atmosphere or with the second gas source 40 is achieved through electrical control. The control method is relatively simple and easy to realize automatic control.

[0072] Specifically, Figure 2 As shown, the first solenoid valve 50 is arranged on the first pipeline 31, and is used to control the rod chamber 20 of the cylinder 01 to be connected with the first gas source 30 or with the atmosphere. When the first solenoid valve 50 is energized, the first solenoid valve 50 switches to the charging position 51, at which time the rod chamber 20 of the cylinder 01 is connected with the first gas source 30; when the first solenoid valve 50 loses power, the first solenoid valve 50 switches to the pressure relief position 52, at which time the rod chamber 20 of the cylinder 01 is connected with the atmosphere.

[0073] The second solenoid valve 60 is arranged on the second pipeline 41, and is used to control the rodless chamber 21 of the cylinder 01 to be connected with the second gas source 40 or with the atmosphere. When the second solenoid valve 60 is energized, the second solenoid valve 60 switches to the charging position 61, and at this time the rodless chamber 21 of the cylinder 01 is connected with the second gas source 40; when the second solenoid valve 60 loses power, the second solenoid valve 60 switches to the pressure relief position 62, and at this time the rodless chamber 21 of the cylinder 01 is connected with the atmosphere.

[0074] Of course, in other embodiments of the present invention, control valves of other types or structures may also be used, and are not limited to the above-mentioned two-position three-way solenoid valve.

[0075] According to one embodiment of the present utility model, Figure 2 As shown, the exhaust port R of the first solenoid valve 50 and the exhaust port R of the second solenoid valve 60 are both connected to an exhaust pipe 71 communicating with the atmosphere, and a muffler 72 is provided on the exhaust pipe 71 .

[0076] In this embodiment, the vent pipe 71 connected to the exhaust port R of the solenoid valve can facilitate the discharge of gas in the rod chamber 20 or the rodless chamber 21 through the exhaust port R of the solenoid valve, avoiding gas shock at the solenoid valve. The muffler 72 arranged on the vent pipe 71 can reduce the noise during the venting process.

[0077] According to one embodiment of the present utility model, Figures 3 to 5 As shown, the clamping force control system of the tail clamp also includes a control unit (not shown in the figure), which is electrically connected to the first solenoid valve 50 and the second solenoid valve 60 to control them to switch between different working positions. Figure 3 As shown, the first solenoid valve 50 is in the pressure relief position 52, and the second solenoid valve 60 is in the pressure charging position 61; when the tail clamp is in the closed clamping state, as shown in FIG. Figure 4 As shown, the first solenoid valve 50 and the second solenoid valve 60 are in the pressure charging position 51 and the pressure charging position 61 respectively; when the tail clamp is in the closed braking state, the first solenoid valve 50 is in the pressure charging position 51, and the second solenoid valve 60 is in the pressure releasing position 62.

[0078] In this embodiment, the control unit can control the first solenoid valve 50 and the second solenoid valve 60 according to the current state of the rolled piece. The control unit is electrically connected to the front cutting mechanism (multiple-length shears) to switch between the clamping, clamping and braking states of the rolled piece according to the cutting timing of the rolled piece, thereby realizing the automation of the rolling of the rolled piece.

[0079] Specifically, the control unit may be a PLC control system, which can switch the state of the cylinder 01 according to the real-time state of the rolled piece on the production line. As can be seen from the above, the process of rolling and shearing the rolled piece on the production line is mainly divided into the following three stages:

[0080] In the first stage before the workpiece reaches the tail clamp, the workpiece moves toward the tail clamp at high speed. At this time, the roll gap of the tail clamp is in an open state, that is, the piston rod 23 of the cylinder 01 needs to be in an extended state.

[0081] The second stage is from when the workpiece reaches the tail clamp to when the double-length shears cut the workpiece. During this process, the workpiece passes through the tail clamp and continues to move toward the tail clamp. Since the workpiece has not been cut yet, it is still in a high-speed motion state. In order to position the workpiece and prevent it from loosening, the roller gap of the tail clamp needs to be switched from an open state to a closed state and remain closed when the workpiece reaches the tail clamp. At this time, the workpiece to be cut is still in a high-speed motion state. In order to reduce the friction between the ring roller and the workpiece, the clamping force of the ring roller on the workpiece needs to be reduced as much as possible, that is, the cylinder 01 needs to provide a relatively small driving force.

[0082] In the third stage after the workpiece is cut, it is separated from the base material. In order to achieve stable stacking of the cut workpiece, the clamping force of the ring roller on the workpiece needs to be increased to decelerate and brake the workpiece, that is, cylinder 01 needs to provide a relatively large driving force.

[0083] After the third stage, the roll gap of the tail clamp opens to throw the workpiece away, preparing to receive the next workpiece and re-enter the first stage. Each section of workpiece cut off from the parent material must go through the above three stages, so the above three stages are carried out continuously.

[0084] The control unit can control the first solenoid valve 50 and the second solenoid valve 60 according to the above three stages. When the rolled piece is in the first stage, the control unit de-energizes the first solenoid valve 50 and energizes the second solenoid valve 60. The rodless chamber 21 of the cylinder 01 is connected to the second air source 40, and the rod chamber 20 of the cylinder 01 is connected to the atmosphere. At this time, under the action of the air pressure P2 provided by the second air source 40, the piston rod 23 of the cylinder 01 extends and the roll gap opens. In fact, the extension process of the above-mentioned piston rod 23 occurs at the beginning of the first stage (that is, in the process of switching from the third stage to the first stage), and the piston rod 23 of the cylinder 01 is in an extended state throughout the first stage.

[0085] After the rolled piece enters the second stage, the control unit energizes the first solenoid valve 50 and the second solenoid valve 60 at the same time, the rod chamber 20 of the cylinder 01 is connected to the first air source 30, the rodless chamber 21 of the cylinder 01 is connected to the second air source 40, and the piston 22 of the cylinder 01 retracts under the pressure difference between the air pressure P1 provided by the first air source 30 and the air pressure P2 provided by the second air source 40 (P1>P2). At this time, under the action of the cylinder 01, the closing of the roll gap produces a relatively small clamping force on the rolled piece, ensuring that the rolled piece can pass through the roll gap and maintain high-speed movement.

[0086] After the rolled piece enters the third stage, the control unit energizes the first solenoid valve 50 and de-energizes the second solenoid valve 60. The rod chamber 20 of the cylinder 01 is connected to the first air source 30, and the rodless chamber 21 of the cylinder 01 is connected to the atmosphere. At this time, under the action of the air pressure P1 provided by the first air source 30, the piston rod 23 remains in a contracted state and can provide a greater clamping force to the ring roller to achieve braking of the rolled piece.

[0087] According to one embodiment of the present utility model, Figure 2 As shown, both the first pipeline 31 and the second pipeline 41 are provided with an oil mist collector 73 .

[0088] In this embodiment, the oil mist device 73 can provide lubrication for the first solenoid valve 50, the second solenoid valve 60 and the piston 22 in the cylinder 01, so as to avoid an increase in the sliding resistance of the valve core and the piston 22 after long-term operation.

[0089] According to one embodiment of the present utility model, Figure 2 As shown, the first gas source 30 and the second gas source 40 are connected to the main gas source 70 through pipelines respectively, and the pipelines between the main gas source 70 and the first gas source 30 and the second gas source 40 are provided with pressure reducing valves 74 .

[0090] In this embodiment, the total gas source 70 provides a stable gas pressure, and two pressure reducing valves 74 are used to form two first gas sources 30 and second gas sources 40 with different pressures, thereby avoiding the need to separately set up two parallel stable gas sources, and the cost is relatively low. At the same time, the pressure of the gas provided by the first gas source 30 and the second gas source 40 can be appropriately adjusted according to the actual operation requirements.

[0091] Specifically, Figure 2 As shown, the total gas source 70 is connected to a gas main pipe, to which are connected two gas branches respectively connected to the first gas source 30 and the second gas source 40. A pressure reducing valve 74 is respectively provided on the two gas branches for adjusting the gas pressure that the first gas source 30 and the second gas source 40 can provide.

[0092] Furthermore, a ball valve 80 and a filter 81 are provided on the gas main pipe. The ball valve 80 is used to control the opening and closing of the pipeline, and the filter 81 is used to filter impurities in the gas.

[0093] According to one embodiment of the present utility model, Figure 2 As shown, both the first gas source 30 and the second gas source 40 are provided with a gas tank 75, and the gas outlet of the gas tank 75 is connected to the first pipeline 31 or the second pipeline 41. The internal volume of the gas tank 75 is much larger than the internal volume of the cylinder 01, which can ensure the stability of the pressure supply of the first gas source 30 and the second gas source 40.

[0094] According to one embodiment of the present utility model, Figure 2 As shown, a pressure gauge 76 is provided on the gas tank 75. The pressure gauge 76 can monitor the gas pressure that can be provided by the first gas source 30 and the second gas source 40 in real time, so that the staff can monitor the entire gas circuit.

[0095] Furthermore, a safety valve 77 is provided at the top of the gas tank 75. When the gas pressure in the gas tank 75 is too high, the gas in the gas tank 75 is discharged through the safety valve 77; a drain valve 78 is provided at the bottom of the gas tank 75 to discharge impurities accumulated at the bottom of the gas tank 75.

[0096] The utility model also provides a method for controlling the clamping force of a tail clamp. The tail clamp is provided with a cylinder 01 for controlling the opening or closing of a roller ring on the tail clamp. The interior of the cylinder 01 is divided into a rod chamber 20 and a rodless chamber 21 by a piston 22. The control method includes:

[0097] When the rolled piece does not need to be clamped, the rod chamber 20 is connected to the atmosphere, the rodless chamber 21 is connected to the low-pressure gas source, and the piston rod 23 of the cylinder 01 is extended to open the tail clamp;

[0098] When the rolled piece needs to be clamped, the rod chamber 20 is connected to the high-pressure gas source, the rodless chamber 21 is connected to the low-pressure gas source, and the piston rod 23 of the cylinder 01 is retracted to put the tail clamp in a closed clamping state;

[0099] When the rolled piece needs to be braked, the rod chamber 20 is connected to the high-pressure gas source, the rodless chamber 21 is connected to the atmosphere, the piston rod 23 of the cylinder 01 remains retracted and the tail clamp is in a closed braking state.

[0100] The clamping force control method of the tail clamp of the utility model controls the connection state between the rod chamber 20 and the rodless chamber 21 of the cylinder 01 and the outside according to the different operation requirements of the rolled piece, so as to ensure that during the clamping and conveying process before the rolled piece is cut, the piston rod 23 of the cylinder 01 can provide a smaller driving force, and during the braking process after the rolled piece is cut, the piston rod 23 of the cylinder 01 can provide a larger driving force, thereby realizing the dynamic switching of the clamping force of the tail clamp on the rolled piece.

[0101] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A clamping force control system for a tail clamp, characterized in that: include: A cylinder, which is arranged on the tail clamp to control the opening or closing of the roller ring on the tail clamp, and the interior of the cylinder is divided into a rod chamber and a rodless chamber by a piston; a first gas source and a second gas source, wherein the first gas source is connected to the rod chamber via a first pipeline, and the second gas source is connected to the rodless chamber via a second pipeline, and control valves are provided on the first pipeline and the second pipeline; Wherein, the air pressure provided by the first air source is greater than the air pressure provided by the second air source; The control valve comprises a first solenoid valve arranged on the first pipeline, the first solenoid valve having an air inlet, a ventilation port and an exhaust port, the first air source is connected to the air inlet of the first solenoid valve, the rod chamber is connected to the ventilation port of the first solenoid valve, the first solenoid valve has a charging position and a pressure relief position, when the first solenoid valve is in the charging position, the air inlet is connected to the ventilation port, and the exhaust port is closed, when the first solenoid valve is in the pressure relief position, the air inlet is closed, and the ventilation port is connected to the exhaust port; The control valve also includes a second solenoid valve arranged on the second pipeline. The structure of the second solenoid valve is the same as that of the first solenoid valve. The second air source is connected to the air inlet of the second solenoid valve, and the rodless chamber is connected to the air exchange port of the second solenoid valve.

2. The clamping force control system of the tail clamp according to claim 1, characterized in that: The exhaust port of the first solenoid valve and the exhaust port of the second solenoid valve are both connected to an exhaust pipe connected to the atmosphere, and a muffler is provided on the exhaust pipe.

3. The clamping force control system of the tail clamp according to claim 1, characterized in that: The control system further comprises a control unit, which is respectively connected to the first solenoid valve and the second solenoid valve to control them to switch between different working positions; When the tail clamp is in an open state, the first solenoid valve is in a pressure relief position, and the second solenoid valve is in a pressure charging position; When the tail clamp is in a closed clamping and feeding state, the first solenoid valve and the second solenoid valve are both in a charging position; When the tail clamp is in a closed braking state, the first solenoid valve is in a pressure charging position, and the second solenoid valve is in a pressure releasing position.

4. The clamping force control system of the tail clamp according to claim 1, characterized in that: The first pipeline and the second pipeline are both provided with lubricators.

5. The clamping force control system of the tail clamp according to claim 1, characterized in that: The first gas source and the second gas source are connected to a total gas source through pipelines respectively, and pressure reducing valves are arranged on the pipelines between the total gas source and the first gas source and the second gas source.

6. The clamping force control system of the tail clamp according to claim 1, characterized in that: The first gas source and the second gas source are both provided with gas tanks, and the gas outlets of the gas tanks are connected to the first pipeline or the second pipeline.

7. The clamping force control system of the tail clamp according to claim 6, characterized in that: The gas tank is provided with a pressure gauge.

8. The clamping force control system of the tail clamp according to claim 6, characterized in that: A drain valve is arranged at the bottom end of the gas tank.

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