A hydraulic sub-control mechanism for a large-size tire building machine

Abstract

The present invention relates to a hydraulic sub-control mechanism of a large-size tire building machine applied in the field of tire building machines, comprising a controller, a hydraulic pump motor and an oil tank; a driver for controlling the operation of the hydraulic pump motor is installed at the front end of the hydraulic pump motor, the driver is electrically connected to the controller, a left oil circuit block and a right oil circuit block are installed at the rear end of the oil tank, two hydraulic pump motors are provided and respectively pump the oil in the oil tank to the left oil circuit block or the right oil circuit block, the left oil circuit block and the right oil circuit block both output pressure oil through an output oil circuit, a corresponding hydraulic cylinder is respectively connected to the rear end of the left oil circuit block and the right oil circuit block, the hydraulic cylinder is used to complete the buckle ring reverse packing operation, an output pressure feedback module is installed at the output end of the hydraulic cylinder, the output pressure feedback module is electrically connected to the driver, and the above-mentioned driver and output pressure feedback module and other structures are adopted to achieve the effect that the two hydraulic cylinders are in different action strokes, but start at the same time and reach the end point at the same time.

Description

Technical Field

[0001] The invention relates to a hydraulic sub-control mechanism, in particular to a hydraulic sub-control mechanism of a large-size tire building machine applied in the field of tire building machines. Background Art

[0002] Large-size tire building machines are mainly used to produce various tires with rim diameters of more than 25 inches. Due to the huge and heavy tire body and long and thick cord layer, it is difficult to complete the action of ordinary cylinder reverse wrapping steel wire rings. Hydraulic drive must be used to achieve finger-type positive capsule reverse wrapping action to complete the cord reverse wrapping steel wire rings. The complete set of equipment has a high degree of automation, complex procedures, and great design difficulty.

[0003] Its basic structure consists of the main machine, forward and reverse wrapping devices, a translational tailstock device, a cord drum expansion and guiding device, a clamping and traction device, a rear pressure roller and a lower pressure roller device, and a tread feeding device, and has a complete automatic control system and a pneumatic and electrical circuit system and a hydraulic transmission system.

[0004] The traditional hydraulic station of the molding machine is controlled by two motors to control the left and right side structures of the molding machine separately. It does not have an output pressure feedback signal, and the required pressure can only be adjusted manually by a fixed mechanical pressure regulating device;

[0005] The key technology of the forming machine - the buckle ring reverse packaging needs stable synchronization and a consistent pressure structure to ensure product quality. However, the lengths of the pipelines on the left and right sides are different, and the differences between the cylinders are also different, resulting in asynchronous movements. Even if the pressures on the left and right sides are adjusted to be inconsistent, only one group of cylinders can be guaranteed to move synchronously. The others are different due to differences in stroke, and inconsistent pressure is also a bad solution. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to provide a hydraulic sub-control mechanism of a large-size tire building machine capable of realizing synchronous reaching action to ensure the consistency of pressure during the buckle bead reverse packing operation.

[0007] To solve the above problems, the present invention provides a hydraulic sub-control mechanism for a large-size tire building machine, comprising a controller for setting a speed analog quantity, a hydraulic pump motor and an oil tank;

[0008] A driver for controlling the operation of the hydraulic pump motor is installed at the front end of the hydraulic pump motor, and the driver is electrically connected to the controller. A left oil block and a right oil block are installed at the rear end of the oil tank. Two hydraulic pump motors are provided and respectively pump the oil in the oil tank to the left oil block or the right oil block. Both the left oil block and the right oil block output pressure oil through the output oil circuit. The rear ends of the left oil block and the right oil block are respectively connected to a corresponding hydraulic cylinder, and the hydraulic cylinder is used to complete the buckle ring reverse packing operation;

[0009] An output pressure feedback module is installed at the output end of the hydraulic cylinder, and the output pressure feedback module is electrically connected to the driver.

[0010] In the hydraulic sub-control mechanism of the above-mentioned large-size tire forming machine, when in use, the corresponding hydraulic pump motor is started through the driver, and the speed and pressure are set in the controller program, and given to the driver through the analog output module, and the corresponding left oil circuit block or right oil circuit block hydraulic valve is opened, so that the hydraulic cylinder starts to move; during the action, the pressure output by the hydraulic cylinder is constantly fed back to the driver through the output pressure feedback module. Once the feedback pressure is greater than or equal to the set pressure, the driver speed will automatically drop to a relatively low value to maintain the pressure. This speed does not require PLC control and can be set directly on the driver; when the feedback pressure is less than the set pressure, the driver runs at the speed analog value set by the controller; when the action is completed, the driver control signal is disconnected, so that the corresponding hydraulic pump motor stops running, and the solenoid valve is closed at the same time;

[0011] In this way, although the hydraulic cylinders on the left and right sides are in different action strokes, they can be adjusted to synchronous action through controllable and differentiated speeds, so that although the starting points are inconsistent, they start at the same time and reach the end point at the same time, so as to ensure the consistency of pressure in the bead reverse packaging operation and improve the product quality of large-size tire building machines.

[0012] As a further supplement to the present application, a group of oil circuits are provided on both the left oil circuit block and the right oil circuit block, and the oil circuits include a telescopic speed regulating oil circuit and an external oil circuit;

[0013] The telescopic speed regulating oil circuit on the left oil circuit block is used to control the telescopic speed regulation of the spreader advance and retreat oil motor, the left capsule oil cylinder, the spreader advance and retreat positioning pin, the spreader rotation positioning pin, and the left buckle ring oil cylinder;

[0014] The telescopic speed regulating oil circuit on the right oil circuit block is used to control the telescopic speed regulation of the right capsule cylinder, cloth puller cylinder, and right buckle ring cylinder;

[0015] The external oil circuit on the left oil circuit block is used to connect the left capsule oil cylinder, the spreader advance and retreat positioning pin oil cylinder, the spreader rotation positioning pin, the spreader expansion and folding oil motor and the left buckle ring oil cylinder;

[0016] The external oil circuit on the right oil circuit block is used to connect the right capsule cylinder, the cloth puller cylinder and the right buckle ring cylinder.

[0017] As a further supplement to the present application, the oil circuit also includes a locking oil circuit;

[0018] The locking oil circuit on the left oil circuit block is used to control the locking of the left capsule cylinder and the left buckle ring cylinder;

[0019] The locking oil circuit on the right oil circuit block is used to control the locking of the cloth puller cylinder and the right buckle ring cylinder.

[0020] As a further supplement to the present application, the oil circuit also includes a locating pin anti-loosening oil circuit, and the locating pin anti-loosening oil circuit on the left oil circuit block is used to control the anti-loosening of the rotating locating pin of the spreader.

[0021] As a further supplement to the present application, the oil circuit also includes a telescopic reversing oil circuit;

[0022] The telescopic reversing oil circuit on the left oil circuit block is used to control the expansion and folding oil motor of the spreader, the left capsule oil cylinder, the advance and retreat positioning pin of the spreader, the rotation positioning pin of the spreader and the telescopic reversing of the left buckle ring oil cylinder;

[0023] The telescopic reversing oil circuit on the right oil circuit block is used to control the telescopic reversing of the right capsule cylinder, cloth puller cylinder and right buckle ring cylinder.

[0024] As a further supplement to the present application, the oil circuit also includes a delay adjustment oil circuit, and the delay adjustment oil circuit on the right oil circuit block is used to control the cloth pulling cylinder and the fast and slow switching delay adjustment.

[0025] As a further supplement to the present application, both the left oil circuit block and the right oil circuit block are provided with a high-pressure oil supply port and a low-pressure oil return port, and the left oil circuit block is also provided with a pressure gauge switch and an oil supply pressure display.

[0026] As another improvement of the present application, the pressure feedback module includes an oil pressure sensor, and the oil pressure sensor is arranged inside the output port of the output oil circuit;

[0027] The end of the output oil circuit of the left oil circuit block or the right oil circuit block is fixedly connected with a pressure relief oil block, and a pressure relief oil circuit with larger inner diameters at both ends and smaller inner diameter in the middle section is opened in the pressure relief oil block;

[0028] A piston that closes the pressure relief oil circuit is slidably connected in the pressure relief oil circuit through a support rod, and a passive telescopic structure is installed on the piston. When the hydraulic pressure in the pressure relief oil block is too large, the piston contracts through the passive telescopic structure and opens the pressure relief oil circuit;

[0029] The pressure relief oil circuit is connected with the external oil return circuit.

[0030] As another improved supplement of the present application, the passive telescopic structure includes a connecting rod and a compression spring. The connecting rod is fixed to the rear end of the piston. The end of the connecting rod away from the piston slides through the support rod in the pressure relief oil block. The compression spring is sleeved on the connecting rod, and the two ends of the compression spring are respectively fixed to the rear end of the piston and the support rod.

[0031] As another improved supplement of the present application, an electric push rod is provided at one end of the connecting rod away from the piston, and the electric push rod is electrically connected to the driver.

[0032] To sum up, when in use, the corresponding hydraulic pump motor is started through the driver, and the speed and pressure are set in the controller program, and given to the driver through the analog output module, and the corresponding left oil block or right oil block hydraulic valve is opened, so that the hydraulic cylinder starts to move; during the action, the pressure output by the hydraulic cylinder is constantly fed back to the driver through the output pressure feedback module. Once the feedback pressure is greater than or equal to the set pressure, the driver speed will automatically drop to a relatively low value to maintain the pressure. This speed does not require PLC control and can be set directly on the driver; when the feedback pressure is less than the set pressure, the driver runs at the speed analog value set by the controller; when the action is completed, the driver control signal is disconnected, so that the corresponding hydraulic pump motor stops running, and the solenoid valve is closed at the same time;

[0033] In this way, although the hydraulic cylinders on the left and right sides are in different action strokes, they can be adjusted to synchronized action through controllable and differentiated speeds, so that although the starting points are inconsistent, they start at the same time and reach the end point at the same time, so as to ensure the consistency of pressure in the buckle bead reverse packaging operation and improve the product quality of large-size tire building machines;

[0034] In the improved scheme, when the piston is subjected to excessive pressure, the excessive pressure of the piston will squeeze the compression spring, causing the compression spring to contract, thereby enabling the piston to move synchronously with the connecting rod, and finally opening the pressure relief oil circuit to achieve a passive automatic pressure relief effect;

[0035] By connecting an electric push rod to the connecting rod, when the oil pressure sensor detects that the pressure is too high, the driver can control the electric push rod to start, thereby driving the piston to move through the connecting rod. The same effect of opening the pressure relief oil circuit for pressure relief can be achieved, but the pressure relief is active and automatic. This method can be selected or used in conjunction with passive automatic pressure relief to achieve a flexible pressure relief effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the composition structure of the first embodiment of the present application;

[0037] Figure 2 This is a schematic structural diagram of the oil tank, left oil block and right oil block of the first embodiment of the present application;

[0038] Figure 3 This is a partial cross-sectional view of the pressure relief oil block and the piston in the second embodiment of the present application;

[0039] Figure 4 This is a schematic diagram of the oil circuit distribution of the left oil circuit block of the first implementation mode of the present application;

[0040] Figure 5 This is a bottom view structural diagram of the left oil circuit block of the first embodiment of the present application;

[0041] Figure 6 This is a schematic diagram of the oil circuit distribution of the right oil circuit block of the first implementation mode of the present application;

[0042] Figure 7 This is a bottom view structural diagram of the right oil circuit block of the first embodiment of the present application;

[0043] Figure 8 This is the sub-control flow chart of the first implementation mode of this application.

[0044] Description of the numbers in the figure:

[0045] 1. Driver; 2. Hydraulic pump motor; 3. Oil tank; 4. Left oil block; 401. Pressure gauge switch; 402. Oil supply pressure display; 5. Right oil block; 6. Hydraulic cylinder; 7. Pressure relief oil block; 701. Pressure relief oil circuit; 8. Piston; 801. Connecting rod; 802. Compression spring; 9. Oil pressure sensor;

[0046] 41. Output oil circuit;

[0047] 4101, telescopic speed regulating oil circuit; 4102, locking oil circuit; 4103, positioning pin anti-loosening oil circuit; 4104, external oil circuit; 4105, telescopic reversing oil circuit; 4106, delay adjustment oil circuit;

[0048] 5101, high-pressure oil supply port; 5102, low-pressure oil return port. DETAILED DESCRIPTION

[0049] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0050] The first implementation method:

[0051] The present invention provides a hydraulic sub-control mechanism for a large-size tire building machine. Figure 1-Figure 2 , including a controller for setting the speed analog quantity, a hydraulic pump motor 2 and an oil tank 3;

[0052] A driver 1 for controlling the operation of the hydraulic pump motor 2 is installed at the front end of the hydraulic pump motor 2, and the driver 1 is electrically connected to the controller. A left oil block 4 and a right oil block 5 are installed at the rear end of the oil tank 3. The hydraulic pump motor 2 is provided with two and respectively pumps the oil in the oil tank 3 to the left oil block 4 or the right oil block 5. The left oil block 4 and the right oil block 5 both output pressure oil through the output oil circuit 41. The rear ends of the left oil block 4 and the right oil block 5 are respectively connected to a corresponding hydraulic cylinder 6, and the hydraulic cylinder 6 is used to complete the buckle ring reverse packing operation;

[0053] An output pressure feedback module is installed at the output end of the hydraulic cylinder 6 , and the output pressure feedback module is electrically connected to the driver 1 .

[0054] Based on the above structure, when in use, the corresponding hydraulic pump motor 2 is started through the driver 1, and the speed and pressure are set in the controller program, and given to the driver 1 through the analog output module, and the corresponding left oil block 4 or right oil block 5 hydraulic valve is opened, so that the hydraulic cylinder 6 starts to move; during the action, the pressure output by the hydraulic cylinder 6 is constantly fed back to the driver 1 through the output pressure feedback module. Once the feedback pressure is greater than or equal to the set pressure, the speed of the driver 1 will automatically drop to a relatively low value to maintain the pressure. This speed does not require PLC control and can be set directly on the driver 1; when the feedback pressure is less than the set pressure, the driver 1 runs at the speed analog value set by the controller; when the action is completed, the driver 1 control signal is disconnected, so that the corresponding hydraulic pump motor 2 stops running, and the solenoid valve is closed at the same time;

[0055] In this way, although the hydraulic cylinders 6 on the left and right sides are in different action strokes, they can be adjusted to synchronous action through controllable and differentiated speeds, so as to achieve the effect of starting at the same time and reaching the end point at the same time although the starting points are inconsistent, so as to ensure the consistency of pressure in the buckle ring reverse packaging operation and improve the product quality of large-size tire building machines.

[0056] Figure 4-Figure 7 It is shown that a group of oil circuits are provided on both the left oil circuit block 4 and the right oil circuit block 5, and the oil circuits include a telescopic speed regulating oil circuit 4101, a locking oil circuit 4102, a positioning pin anti-loosening oil circuit 4103, an external oil circuit 4104, a telescopic reversing oil circuit 4105 and a delay regulating oil circuit 4106;

[0057] The telescopic speed regulating oil circuit 4101 on the left oil circuit block 4 is used to control the telescopic speed regulation of the spreader advance and retreat oil motor, the left capsule oil cylinder, the spreader advance and retreat positioning pin, the spreader rotation positioning pin, and the left buckle ring oil cylinder;

[0058] The telescopic speed regulating oil circuit 4101 on the right oil circuit block 5 is used to control the telescopic speed regulation of the right capsule cylinder, the cloth pulling cylinder, and the right buckle ring cylinder;

[0059] The external oil circuit 4104 on the left oil circuit block 4 is used to connect the left capsule cylinder, the spreader advance and retreat positioning pin cylinder, the spreader rotation positioning pin, the spreader expansion and folding oil motor and the left buckle ring cylinder;

[0060] The external oil circuit 4104 on the right oil circuit block 5 is used to connect the right capsule cylinder, the cloth pulling cylinder and the right buckle ring cylinder;

[0061] The locking oil circuit 4102 on the left oil circuit block 4 is used to control the locking of the left capsule oil cylinder and the left buckle ring oil cylinder;

[0062] The locking oil circuit 4102 on the right oil circuit block 5 is used to control the locking of the cloth pulling cylinder and the right buckle ring cylinder;

[0063] The positioning pin anti-loosening oil circuit 4103 on the left oil circuit block 4 is used to control the anti-loosening of the rotary positioning pin of the spreader;

[0064] The telescopic reversing oil circuit 4105 on the left oil circuit block 4 is used to control the telescopic reversing of the spreader expansion and folding oil motor, the left capsule oil cylinder, the spreader advance and retreat positioning pin, the spreader rotation positioning pin and the left buckle ring oil cylinder;

[0065] The telescopic reversing oil circuit 4105 on the right oil circuit block 5 is used to control the telescopic reversing of the right capsule cylinder, the cloth pulling cylinder and the right buckle ring cylinder;

[0066] The delay adjustment oil circuit 4106 on the right oil circuit block 5 is used to control the cloth pulling cylinder and the fast and slow switching delay adjustment;

[0067] The left oil circuit block 4 and the right oil circuit block 5 are both provided with a high-pressure oil supply port 5101 and a low-pressure oil return port 5102 . The left oil circuit block 4 is also provided with a pressure gauge switch 401 and an oil supply pressure display 402 .

[0068] Through the setting of the telescopic speed regulation oil circuit 4101, the locking oil circuit 4102, the locating pin anti-loosening oil circuit 4103, the external oil circuit 4104, the telescopic reversing oil circuit 4105 and the delay adjustment oil circuit 4106, the pressure distribution control and output can be performed on multiple components such as the spreader advance and retreat oil motor, the control spreader expansion and folding oil motor, the left capsule cylinder, the spreader advance and retreat locating pin, the spreader rotation locating pin, the left buckle ring cylinder, the right capsule cylinder, the cloth puller cylinder, the right buckle ring cylinder, etc., so as to perform telescopic speed regulation, locking, anti-loosening, telescopic reversing, fast and slow switching delay adjustment and other operations on the above-mentioned components, so as to cooperate with the driver 1 and the output pressure feedback module to realize the separate control of multiple actions of multiple components, so that the multiple actions of multiple components can be started and completed at the same time, thereby better ensuring the consistency of the coordination of each component in the buckle ring reverse packaging operation, and further improving the product quality of large-size tire forming machines.

[0069] Second implementation method:

[0070] Figure 3 Another hydraulic sub-control mechanism of a large-size tire building machine is shown, which is different from the first embodiment in that:

[0071] The pressure feedback module includes an oil pressure sensor 9, which is arranged inside the output port of the output oil circuit 41;

[0072] The ends of the output oil passage 41 of the left oil passage block 4 or the right oil passage block 5 are fixedly connected to a pressure relief oil block 7, and a pressure relief oil passage 701 with larger inner diameters at both ends and smaller inner diameter in the middle section is provided in the pressure relief oil block 7;

[0073] A piston 8 closing the pressure relief oil circuit 701 is slidably connected in the pressure relief oil circuit 701 through a support rod, and a passive telescopic structure is installed on the piston 8. When the hydraulic pressure in the pressure relief oil block 7 is too large, the piston 8 contracts through the passive telescopic structure and opens the pressure relief oil circuit 701.

[0074] The pressure relief oil circuit 701 is communicated with the external oil return circuit.

[0075] Based on the above structure, when the pressure in the output oil circuit 41 of the left oil circuit block 4 or the right oil circuit block 5 is much greater than the set pressure, the larger pressure will drive the piston 8 to compress the passive telescopic structure and move, so that the pressure relief oil circuit 701 opens, so that the hydraulic oil in the output oil circuit 41 is automatically depressurized when passing through the pressure relief oil block 7, so that the excessive oil pressure can be quickly balanced, thereby cooperating with the driver 1 to achieve the purpose of quickly adjusting the output pressure, achieving a better effect of controlling the stroke of the hydraulic cylinder 6, and can also play a certain protective role on the oil circuit in the hydraulic cylinder 6, thereby extending the service life of the hydraulic cylinder 6.

[0076] It should be noted that a main oil circuit connected to the output oil circuit 41 and the pressure relief oil circuit 701 is also provided on the pressure relief oil block 7. The main oil circuit is used to connect the output oil circuit 41 and the hydraulic cylinder 6 when the pressure is normal. At this time, the pressure oil can be controlled before entering the hydraulic cylinder 6, which can not only protect the hydraulic cylinder 6 to a certain extent, but also achieve the purpose of controlling the stroke of the hydraulic cylinder 6. Compared with Example 1, the position of the control pressure is different, but the effect is similar.

[0077] Figure 3 and Figure 8 The passive telescopic structure is shown to include a connecting rod 801 and a compression spring 802. The connecting rod 801 is fixed to the rear end of the piston 8. The end of the connecting rod 801 away from the piston 8 slides through the support rod in the pressure relief oil block 7. The compression spring 802 is sleeved on the connecting rod 801, and the two ends of the compression spring 802 are respectively fixed to the rear end of the piston 8 and the support rod. When the piston 8 is subjected to excessive pressure, the excessive pressure of the piston 8 will squeeze the compression spring 802, causing the compression spring 802 to contract, so that the piston 8 can move synchronously with the connecting rod 801, and finally the pressure relief oil circuit 701 is opened, achieving a passive automatic pressure relief effect.

[0078] An electric push rod is disposed at one end of the connecting rod 801 away from the piston 8, and the electric push rod is electrically connected to the driver 1;

[0079] By connecting an electric push rod to the connecting rod 801, when the oil pressure sensor 9 detects that the pressure is too high, the driver 1 can control the electric push rod to start, thereby driving the piston 8 to move through the connecting rod 801, and the same effect of opening the pressure relief oil circuit 701 for pressure relief can be achieved, but the pressure relief is active and automatic; this method can be arbitrarily selected or used in conjunction with passive automatic pressure relief (that is, the driver 1 is set to start the electric push rod to intervene after the oil pressure sensor 9 detects that the pressure is too high for a period of time (at this time, the compression spring 802 may accidentally cause the piston 8 to be unable to move), so as to achieve the coordinated use of passive and active pressure relief), to achieve a flexible pressure relief effect.

[0080] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A hydraulic sub-control mechanism for a large-size tire building machine, comprising a controller for setting a speed analog value, a hydraulic pump motor (2) and an oil tank (3), characterized in that: A driver (1) for controlling the operation of the hydraulic pump motor (2) is installed at the front end of the hydraulic pump motor (2), and the driver (1) is electrically connected to the controller. A left oil circuit block (4) and a right oil circuit block (5) are installed at the rear end of the oil tank (3). Two hydraulic pump motors (2) are provided, and the oil in the oil tank (3) is pumped to the left oil circuit block (4) or the right oil circuit block (5) respectively. The left oil circuit block (4) and the right oil circuit block (5) both output pressurized oil through the output oil circuit (41). The rear ends of the left oil circuit block (4) and the right oil circuit block (5) are respectively connected to a corresponding hydraulic cylinder (6), and the hydraulic cylinder (6) is used to complete the buckle ring reverse packing operation; An output pressure feedback module is installed at the output end of the hydraulic cylinder (6), and the output pressure feedback module is electrically connected to the driver (1); The left oil circuit block (4) and the right oil circuit block (5) are each provided with a group of oil circuits, the oil circuits comprising a telescopic speed regulating oil circuit (4101) and an external oil circuit (4104); The telescopic speed regulating oil circuit (4101) on the left oil circuit block (4) is used to control the telescopic speed regulation of the spreader advance and retreat oil motor, the left capsule oil cylinder, the spreader advance and retreat positioning pin, the spreader rotation positioning pin, and the left buckle ring oil cylinder; The telescopic speed regulating oil circuit (4101) on the right oil circuit block (5) is used to control the telescopic speed regulating of the right capsule cylinder, the cloth pulling cylinder, and the right buckle ring cylinder; The external oil circuit (4104) on the left oil circuit block (4) is used to connect the left capsule oil cylinder, the spreader advance and retreat positioning pin oil cylinder, the spreader rotation positioning pin, the spreader expansion and folding oil motor and the left buckle ring oil cylinder; The external oil circuit (4104) on the right oil circuit block (5) is used to connect the right capsule cylinder, the cloth pulling cylinder and the right buckle ring cylinder; The oil circuit also includes a locking oil circuit (4102); The locking oil circuit (4102) on the left oil circuit block (4) is used to control the locking of the left capsule oil cylinder and the left buckle ring oil cylinder; The locking oil circuit (4102) on the right oil circuit block (5) is used to control the locking of the cloth pulling cylinder and the right buckle ring cylinder; The oil circuit also includes a positioning pin anti-loosening oil circuit (4103), and the positioning pin anti-loosening oil circuit (4103) on the left oil circuit block (4) is used to control the anti-loosening of the rotating positioning pin of the spreader; The oil circuit also includes a telescopic reversing oil circuit (4105); The telescopic reversing oil circuit (4105) on the left oil circuit block (4) is used to control the telescopic reversing of the spreader expansion and folding oil motor, the left capsule oil cylinder, the spreader advance and retreat positioning pin, the spreader rotation positioning pin and the left buckle ring oil cylinder; The telescopic reversing oil circuit (4105) on the right oil circuit block (5) is used to control the telescopic reversing of the right capsule cylinder, the cloth pulling cylinder and the right buckle ring cylinder; The oil circuit also includes a delay adjustment oil circuit (4106), and the delay adjustment oil circuit (4106) on the right oil circuit block (5) is used to control the cloth pulling device cylinder and the fast and slow switching delay adjustment; The pressure feedback module comprises an oil pressure sensor (9), and the oil pressure sensor (9) is arranged inside the output port of the output oil circuit (41); The end of the output oil passage (41) of the left oil passage block (4) or the right oil passage block (5) is fixedly connected to a pressure relief oil block (7), and the pressure relief oil block (7) is provided with a pressure relief oil passage (701) having larger inner diameters at both ends and a smaller inner diameter in the middle; A piston (8) for closing the pressure relief oil circuit (701) is slidably connected in the pressure relief oil circuit (701) via a support rod, and a passive telescopic structure is installed on the piston (8). When the hydraulic pressure in the pressure relief oil block (7) is too high, the piston (8) contracts through the passive telescopic structure and opens the pressure relief oil circuit (701); The pressure relief oil circuit (701) is in communication with an external oil return circuit; The passive telescopic structure comprises a connecting rod (801) and a compression spring (802); the connecting rod (801) is fixed to the rear end of the piston (8); one end of the connecting rod (801) away from the piston (8) slides through a support rod in the pressure relief oil block (7); the compression spring (802) is sleeved on the connecting rod (801), and two ends of the compression spring (802) are respectively fixed to the rear end of the piston (8) and the support rod; An electric push rod is provided at one end of the connecting rod (801) away from the piston (8), and the electric push rod is electrically connected to the driver (1).

2. The hydraulic sub-control mechanism of a large-size tire building machine according to claim 1 is characterized in that: The left oil circuit block (4) and the right oil circuit block (5) are both provided with a high-pressure oil supply port (5101) and a low-pressure oil return port (5102), and the left oil circuit block (4) is also provided with a pressure gauge switch (401) and an oil supply pressure display (402).

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