A catapult drive device

Abstract

The present application relates to the technical field of drive devices, and specifically to a catapult drive device, which includes: a traction rope, which is connected to a carrier; a first drive assembly, which is connected to the traction rope; a first reset rope, which is elastic and has a first connector provided on the first reset rope; a second reset rope, which has a second connector provided on it; a second drive assembly, which is configured to drive the first reset rope to pull the first connector to move in a second direction opposite to the first direction, and to change the resistance of the first connector to the movement of the first reset rope. The second drive assembly is also configured to drive the second reset rope to pull the second connector to move in the first direction, thereby performing buffer braking through the cooperation of the first connector, the second connector, and the second drive assembly, which has little impact on the drive device and high reliability.

Description

Technical Field

[0001] The present application relates to the technical field of drive devices, and in particular to an ejection drive device. Background Art

[0002] Most existing hydraulic ejection drive devices use a hydraulic motor as an actuator, that is, the hydraulic motor drives the drum to rotate, directly pulling the wire rope, so that the wire rope pulls the accelerated object to move and accelerate it.

[0003] However, after the acceleration of such a drive device is completed, the hydraulic motor is mainly used for sudden reversal to perform buffering. This buffering method will have a large impact on the drive device and affect the performance of the drive device. Summary of the Invention

[0004] The present application provides an ejection drive device to solve the problem that the existing drive device uses a hydraulic motor to perform buffering by sudden reversal, which may cause a large impact on the drive device.

[0005] In order to solve the above problems, this application adopts the following technical solutions:

[0006] The present application provides an ejection drive device for driving a carrier to reciprocate along a guide rail, wherein the carrier is used to carry an accelerated object. The ejection drive device includes:

[0007] a traction rope connected to the load-bearing member;

[0008] a first driving assembly connected to the traction rope so that the traction rope pulls the supporting member to move from an initial position toward a first direction;

[0009] a first reset cord having elasticity and provided with a first connecting member, the first connecting member being configured to connect to the carrier when the carrier moves to a predetermined position along the first direction, and to push the carrier to move in a second direction opposite to the first direction to the initial position as the carrier moves in the first direction;

[0010] a second reset rope having a second connecting member provided thereon, wherein the second connecting member is configured to push the first connecting member to move toward the first direction to the predetermined position when the first connecting member pushes the supporting member to move toward the second direction to the predetermined position;

[0011] a second driving assembly configured to drive the first reset cord to pull the first connecting member to move toward the second direction and to change the resistance of the first connecting member to the movement of the first reset cord; and the second driving assembly is further configured to drive the second reset cord to pull the second connecting member to move toward the first direction.

[0012] In some possible designs, the first reset cord is a nylon cord.

[0013] In some possible designs, the second drive assembly includes a first drum, a first drum shaft, a second drum, and a second drum shaft, the first drum being mounted on the first drum shaft, the second drum being mounted on the second drum shaft, one end of the first reset cord being connected to the first connector and the other end being wound around the first drum, and one end of the second reset cord being connected to the second connector and the other end being wound around the second drum;

[0014] The second drive assembly also includes at least one brake member, a first clutch, a second clutch, a transfer case and a reset motor. The brake member is installed on the first drum shaft and is used to adjust the rotational resistance of the first drum shaft. The first clutch is used to connect the transfer case and the first drum shaft. The second clutch is used to connect the transfer case and the second drum shaft. The transfer case is used to be connected to the output end of the reset motor to transmit the power of the reset motor to the first clutch and the second clutch.

[0015] In some possible designs, the braking component includes a brake disc and a brake, the brake disc is fixed on the first reel shaft, the brake includes two brake blocks and a driving cylinder, the two brake blocks are arranged on both sides of the brake disc, and the driving cylinder is used to adjust the position of the brake block so that the brake block clamps or releases the brake disc.

[0016] In some possible designs, an oil supply device is also included, which includes an oil tank, a first reversing valve, an electric proportional pressure reducing valve and at least one first accumulator. The reset motor is connected to the first reversing valve, the driving cylinder is connected to the electric proportional pressure reducing valve, the oil tank is connected to the first accumulator and the electric proportional pressure reducing valve, and the first accumulator is also connected to the electric proportional pressure reducing valve and the first reversing valve.

[0017] In some possible designs, the first drive assembly includes a traction cylinder and at least one pulley group, the pulley group includes a fixed pulley group and a movable pulley group, the fixed pulley group and the movable pulley group each include at least two pulleys, the traction cylinder is used to drive the movable pulley group to move toward or away from the fixed pulley group, one end of the traction rope is connected to the bearing member, and the other end alternately passes around the pulleys of the fixed pulley group and the movable pulley group.

[0018] In some possible designs, the oil supply device also includes at least one third accumulator, a launch main valve, a charging valve, a switch valve, a booster tank, an oil drain valve and at least one gas cylinder. The traction cylinder is connected to the charging valve and the launch main valve. The oil tank is connected to the oil drain valve, the launch main valve, the third accumulator and the switch valve. The launch main valve is also connected to the third accumulator. The top of the booster tank is connected to the gas cylinder, and the bottom of the booster tank is connected to the oil drain valve and the charging valve.

[0019] In some possible designs, there are two pulley blocks, which are respectively arranged on both sides of the traction cylinder. One end of the traction rope is connected to the supporting member, and the other end is connected to the supporting member after passing through the two pulley blocks in sequence.

[0020] In some possible designs, the first drive assembly further includes two damping cylinders, a balancing wheel, a balancing bracket, a screw, and an adjustment mechanism. The two damping cylinders are arranged in parallel on both sides of the balancing wheel. The balancing wheel is rotatably mounted on the balancing bracket. The balancing bracket is connected to the screw, and the adjustment mechanism is connected to the screw to drive the screw to push the balancing bracket toward or away from the adjustment mechanism.

[0021] The traction rope includes a first connecting section, a second connecting section and a third connecting section. One end of the first connecting section is connected to the supporting member, and the other end is connected to one of the pulley sets and then connected to one of the damping cylinders. One end of the third connecting section is connected to the supporting member, and the other end is connected to another of the damping cylinders after passing around another of the pulley sets. One end of the second connecting section is connected to one of the damping cylinders, and the other end is connected to another of the damping cylinders after passing around the balancing wheel.

[0022] In some possible designs, the oil supply device also includes a first one-way valve, at least one second accumulator, a second reversing valve and a first overflow valve, and a damping valve connected in sequence. The damping valve is connected to the second reversing valve and the first overflow valve. The damping valve and the first one-way valve are also connected to the damping cylinder so that the hydraulic oil in the second accumulator can enter the damping cylinder through the first one-way valve. The first overflow valve is connected to the oil tank.

[0023] The ejection drive device provided by the present application separates acceleration and buffering, that is, the accelerated object is first accelerated by moving the carrier through the traction rope. After accelerating to a predetermined speed, the first connecting member, the first reset rope and the second drive assembly cooperate to gradually decelerate the carrier to a stop. In this process, since the first reset rope is elastic, the first reset rope will elastically stretch slightly, which has little impact on the drive device and has high reliability. Finally, the second connecting member, the second reset rope and the second drive assembly cooperate to reset the carrier and the first connecting member, and then the next acceleration can be carried out, which is extremely convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] Figure 1 A schematic diagram of the structure of the ejection drive device provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the oil supply device;

[0027] Figure 3 for Figure 1 Schematic diagram of the connection structure between the damping oil cylinder and the oil supply device;

[0028] Figure 4 for Figure 1 Schematic diagram of the connection structure between the balance bracket and the screw rod;

[0029] Figure 5 for Figure 1 Schematic diagram of the structure of the second drive component in.

[0030] Reference numerals:

[0031] 1-Traction rope, 2-Accelerated object, 3-Carrying member, 4-Moving pulley group, 5-Fixed pulley group, 6-Traction cylinder, 7-Damping cylinder, 702-Second accumulator, 703-First one-way valve, 704-Second reversing valve, 705-Damping valve, 706-First overflow valve, 8-Balance bracket, 802-Balance wheel, 803-Adjustment mechanism, 804-Screw rod, 9-First guide pulley, 10-Third guide pulley, 11-Second reset rope, 12-First reset rope, 12a-First connecting member, 12b-Second connecting member, 13-Second drive assembly, 1301-Brake disc, 1302- Brake, 1303-first reel, 1305-second reel, 1306a-second clutch, 1306b-first clutch, 1307-reset motor, 1308-transfer case, 14-liquid level sensor, 15-boost tank, 16-gas cylinder, 17-switching valve, 18-drain valve, 19-second one-way valve, 20-motor, 21-oil pump, 22-second overflow valve, 23-oil tank, 24-third accumulator, 25-launching main valve, 26-charging valve, 27-first accumulator, 28-pressure reducing valve, 29-first reversing valve, 30-one-way throttle valve, 31-electric proportional pressure reducing valve.

[0032] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0034] As described in the background technology, when the driving device of the hydraulic ejection system uses a hydraulic motor as an actuator, after the acceleration is completed, the hydraulic motor will suddenly reverse for buffering. This buffering method will cause a large impact on the driving device and affect the performance of the driving device.

[0035] In addition, when using a hydraulic motor as an actuator, it is also limited by the speed of the hydraulic motor and the diameter of the drum, and cannot achieve high-speed acceleration of large mass loads. It can generally only be used for acceleration of small drones and has a narrow scope of application.

[0036] At present, although the use of oil cylinders and multiple pulley sets can achieve high-speed acceleration of large mass loads, if the oil cylinder back cavity buffering method is used for deceleration buffering, it is easy to cause buffering failure due to the limitation of the effective area of ​​the back cavity or the strength of the piston rod. If the diameter of the oil cylinder or the piston rod is increased, the volume and flow of the oil cylinder will increase.

[0037] Some people also use external buffers in combination with oil cylinders and speed pulleys to avoid the problem of buffer failure. However, the traditional external buffer method has poor adjustability, and the buffering process will still cause a large impact on the drive system.

[0038] In order to avoid the above problems, the present application provides a catapult drive device. During the buffering braking process, the first reset rope will elastically stretch slightly, which cooperates with the second reset rope and the second drive assembly. During the buffering braking process, the impact on the drive device is small and the reliability is high.

[0039] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0040] See Figure 1 As shown, an embodiment of the present application provides a catapult drive device, which is used to drive a carrier 3 to move back and forth along a guide rail, wherein the carrier 3 is used to carry the accelerated object 2, which can be a common component such as a trolley or a slide rope. As long as it can be used to carry the accelerated object 2 and can automatically release the limit on the accelerated object 2 after the acceleration is completed, this embodiment does not limit it here, and the guide rail is a pre-set acceleration track, generally a linear guide rail, which is well known to those skilled in the art and will not be described in detail in this embodiment.

[0041] The ejection drive device provided in this embodiment includes a traction rope 1 , a first drive assembly, a first reset rope 12 , a second reset rope 11 and a second drive assembly 13 .

[0042] The traction rope 1 is connected to the carrier 3 to pull the carrier 3 and accelerate the accelerated object 2. The first drive assembly is connected to the traction rope 1 to provide power to pull the carrier 3 from its initial position in the first direction X for acceleration. The first reset rope 12 is provided with a first connector 12a. The first reset rope 12 is elastic, that is, during use, the first reset rope 12 can undergo a small elastic extension. The second reset rope 11 is provided with a second connector 12b, which cooperates with the first connector 12a. When moving in the same direction, the two contact each other and promote the same direction of movement. When moving in opposite directions, they separate and do not affect each other. The second drive assembly 13 is connected to the first reset cord 12 and the second reset cord 11. That is, the second drive assembly 13 can drive the first reset cord 12 to pull the first connecting member 12a to move in the second direction Y opposite to the first direction X. It can also provide resistance to slow down the first connecting member 12a when the first connecting member 12a moves in the first direction X. The second drive assembly 13 can also drive the second reset cord 11 to pull the second connecting member 12b to move in the first direction X. It can be understood that the first direction X and the second direction Y are both parallel to the extension direction of the guide rail.

[0043] The first reset cord 12 may be a nylon cord. Nylon cord is not only elastic, but also lightweight, strong, and highly resistant to oil, corrosion, and wear, effectively pulling the first connector 12a. It is understood that the first reset cord 12 may also be made of other materials that exhibit a certain degree of elasticity and meet the requirements of use, and this embodiment is not limited thereto.

[0044] The traction rope 1 and the second reset rope 11 can be steel ropes or other rope-like objects, as long as they can effectively bear the tension, and this embodiment does not limit them.

[0045] It can be understood that the first connecting member 12a and the second connecting member 12b can both be common structures such as hooks, as long as the first connecting member 12a can move synchronously with the supporting member 3 when they are in contact and move in the same direction, and separate themselves when they move in opposite directions. The second connecting member 12b can move synchronously with the first connecting member 12a when they are in contact and move in the same direction, and separate themselves when they move in opposite directions. This embodiment does not limit this.

[0046] In addition, the traction rope 1 can be guided by the first guide pulley so that it extends in the required direction, the first reset rope 12 can be guided by the second guide pulley, and the second reset rope 11 can be guided by the third guide pulley. The number of guide pulleys can be selected according to actual guiding requirements, and this embodiment does not limit it here.

[0047] Specifically, in the initial state of the ejection drive device, the carrier 3 is located at the initial position, the first connecting member 12a is located at the predetermined position, the second connecting member 12b is located on the side of the first connecting member 12a facing the carrier 3, and the first connecting member 12a is in contact with the second connecting member 12b or a slight distance is reserved between the two.

[0048] During use, the accelerated object 2 is mounted on the carrier 3, the first drive assembly is loaded, and the carrier 3 is pulled to accelerate in the first direction X, thereby accelerating the accelerated object 2. After the carrier 3 reaches the predetermined position, it contacts the first connecting member 12a, causing the first connecting member 12a to move in the first direction X along with the second connecting member 12b. At this time, the first reset rope 12 will produce a small elastic extension, and the second drive assembly 13 will provide resistance, so that the resistance transmitted by the first reset rope 12 to the first connecting member 12a increases, and the resistance of the carrier 3 to push the first connecting member 12a to move increases, and the first drive assembly is unloaded, so that the carrier 3 and the first connecting member 12a gradually decelerate, and the accelerated object 2 flies out, while the carrier 3 and the first connecting member 12a will continue to The vehicle body 3 is moved in the second direction Y by the second reset rope 12. When the first link 12a passes the predetermined position, it contacts the second link 12b, thereby synchronously pushing the second link 12b to move together. After the vehicle body 3 returns to the initial position, the second drive member drives the second reset rope 11 to pull the second link 12b to move in the first direction X. At this time, the second link 12b pushes the first link 12a to move synchronously. After the first link 12a returns to the predetermined position, it stops moving, thereby returning the drive device to its initial state. The entire buffering process is relatively gentle, with little impact on the drive device and high reliability.

[0049] In addition, it can be understood that the first drive assembly can be a combination of a hydraulic motor and a reel, or a combination of an oil cylinder and a double-speed chain pulley, which is not limited in this embodiment.

[0050] For some possible implementations, see Figure 1 and Figure 5 As shown, the second drive assembly 13 includes a first drum 1303, a first drum shaft, a second drum 1305 and a second drum shaft. The first drum 1303 is installed on the first drum shaft, and the second drum 1305 is installed on the second drum shaft. One end of the first reset rope 12 is connected to the first connecting member 12a, and the other end is wound around the first drum 1303. One end of the second reset rope 11 is connected to the second connecting member 12b, and the other end is wound around the second drum 1305.

[0051] The second drive assembly 13 also includes at least one brake, a first clutch 1306b, a second clutch 1306a, a transfer case 1308 and a reset motor 1307. The brake is mounted on the first drum shaft and is used to adjust the rotational resistance of the first drum shaft, thereby controlling the resistance of the first reset rope 12 to release the rope, so that when the supporting member 3 pushes the first connecting member 12a to move in the first direction X, it can gradually decelerate under the resistance provided by the brake. The first clutch 1306b is used to connect the transfer case 1308 and the first reel shaft, the second clutch 1306a is used to connect the transfer case 1308 and the second reel shaft, and the transfer case 1308 is used to connect to the output end of the reset motor 1307 to transmit the power of the reset motor 1307 to the first clutch 1306b and the second clutch 1306a. As long as the first clutch 1306b is engaged, the reset motor 1307 can transmit power to the first reel shaft through the transfer case 1308 to rotate the first reel shaft. Similarly, as long as the second clutch 1306a is engaged, the reset motor 1307 can transmit power to the second reel shaft through the transfer case 1308 to rotate the second reel shaft.

[0052] Among them, such as Figure 1 As shown, the first reset rope 12 is made of nylon rope, and the first drum 1303 is arranged on the right side of the initial position of the supporting member 3 (in the Y direction of the supporting member 3). The first direction X and the second direction Y are on the same straight line. Therefore, the first reset rope 12 does not need to be turned. At this time, the number of second guide pulleys can be set to 0, that is, there is no need to use a second guide pulley, and two second guide pulleys are provided. The arrangement direction thereof is perpendicular to the extension direction of the guide rail. One end of the second reset rope 11 is connected to the second connecting member 12b, and the second connecting member 12b is located between the first connecting member 12a and the supporting member 3. The other end is first connected to a second guide pulley, so that the second reset rope 11 between the guide pulley and the first connecting member 12a is parallel to the guide rail, and then passes around the second guide pulley and is connected to the second drum 1305. The first reset rope 12 between this second guide pulley and the second drum 1305 is also parallel to the guide rail.

[0053] Exemplarily, the lower end of the first reel shaft is connected to the first clutch 1306b, and the lower end of the second reel shaft is connected to the second clutch 1306a. The transfer case 1308 can include multiple gears to transmit power through gears. For example, the transfer case 1308 includes two gears, one gear is connected to the first clutch 1306b, and the other gear is connected to the second clutch 1306a. The two gears are engaged with each other. The output end of the reset motor 1307 is connected to a gear, which can drive a gear to rotate. When the reset motor 1307 is started, it can drive the two gears to rotate. As long as either the first clutch 1306b or the second clutch 1306a is in a coupled state, power can be transmitted. When the first clutch 1306b and the second clutch 1306a are separated, power cannot be transmitted.

[0054] It is understandable that the transfer case 1308 may have other structures as long as it can effectively transmit the power of the reset motor 1307 to the first clutch 1306b and the second clutch 1306a. This embodiment is only an example and not a limitation.

[0055] In addition, the first clutch 1306b and the second clutch 1306a are both existing devices. When the clutch is engaged, the power of the reset motor 1307 transmitted through the transfer case 1308 can be transmitted to the reel shaft. When the clutch is disengaged, the power transmission to the reel shaft can be stopped, thereby controlling the transmission of power between the reset motor 1307 and the reel shaft through the clutch.

[0056] Such a setting can realize the rotation control of the first reel shaft and the second reel shaft through a reset motor 1307, which helps to simplify the structure of the second drive component 13.

[0057] In some possible embodiments, the braking component includes a brake disc 1301 and a brake 1302, the brake disc 1301 is fixed on the first reel shaft, the brake 1302 includes two brake blocks and a driving cylinder, the two brake blocks are arranged on both sides of the brake disc 1301, and the driving cylinder is used to adjust the position of the brake block so that the brake block clamps or releases the brake disc 1301.

[0058] Specifically, the brake disc 1301 can be a metal disc, and the brake 1302 can use the caliper assembly of a common disc brake, such as a floating caliper and a fixed caliper, and the installation and connection method of the brake block and the driving cylinder can be adaptively adjusted according to the specific type selected by the brake 1302. This is well known to those skilled in the art and will not be described in detail in this embodiment.

[0059] During use, when the carrier 3 contacts the first connecting member 12a and pushes the first connecting member 12a in the first direction X, the driving cylinder is loaded, causing the brake block to move toward the brake disc 1301 and gradually clamp the brake disc 1301, thereby gradually increasing the rotational resistance of the first spool shaft. This causes the carrier 3 and the first connecting member 12a to gradually decelerate, and the magnitude of the deceleration can be adjusted by the force with which the brake block clamps the brake disc 1301. After the driving cylinder drives the brake block to move back and separate from the brake disc 1301, the rotational resistance applied by the brake member to the first spool shaft disappears, allowing the first spool shaft to rotate freely.

[0060] It is understandable that the braking member can be provided as one or more, as long as it can effectively perform braking, and this embodiment does not limit it.

[0061] Exemplarily, there are two brake members, and the two brake members are respectively arranged at both ends of the first reel shaft. The middle part of the brake disc 1301 is fixedly connected to the reel shaft. The brake 1302 is located on one side of the first reel shaft and is supported by a special mounting frame.

[0062] For some possible implementations, see Figure 3 As shown, the ejection drive device also includes an oil supply device, which includes an oil tank 23, a first reversing valve 29, an electric proportional pressure reducing valve 31 and at least one first accumulator 27. The reset motor 1307 is connected to the first reversing valve 29, the driving cylinder is connected to the electric proportional pressure reducing valve 31, the oil tank 23 is connected to the first accumulator 27 and the electric proportional pressure reducing valve 31, and the first accumulator 27 is also connected to the electric proportional pressure reducing valve 31 and the first reversing valve 29.

[0063] Specifically, the first reversing valve 29 has an oil inlet, an oil return port and two convertible oil outlets. The oil inlet is connected to the oil tank 23 and the first accumulator 27, the oil return port is also connected to the oil tank 23, and both oil outlets are connected to the reset motor 1307.

[0064] Of course, a pressure reducing valve 28 can be added at the oil inlet to maintain a stable pressure upstream of the first reversing valve 29, thereby ensuring a relatively stable flow rate. Furthermore, a one-way throttle valve 30 can be added between each of the two oil outlets and the reset motor 1307 to adjust the speed of the reset motor 1307.

[0065] Specifically, when the reset motor 1307 is working, the hydraulic oil in the oil tank 23 enters the reset motor 1307 through the first reversing valve 29. One oil outlet of the first reversing valve 29 sends the hydraulic oil into the reset motor 1307, and the other oil outlet is used to return the oil, so that the reset motor 1307 rotates in the required direction. When the rotation direction of the reset motor 1307 needs to be changed, it is only necessary to change the direction through the first reversing valve 29, and the first accumulator 27 is used to ensure that the minimum pressure meets the requirements. Of course, one or more first accumulators 27 can be set, and the specific minimum pressure requirement shall be met. This embodiment does not limit it here.

[0066] In addition, the electric proportional pressure reducing valve 31 can adjust the oil inlet pressure of the driving cylinder, thereby adjusting the braking force of the brake 1302 to perform buffer braking on the carrier 3, making braking simpler.

[0067] In some possible embodiments, the first drive assembly includes a traction cylinder 6 and at least one pulley block, the pulley block including a fixed pulley block 5 and a movable pulley block 4, each of which includes at least two pulleys. The traction cylinder 6 is used to drive the movable pulley block 4 to move toward or away from the fixed pulley block 5. One end of the traction rope 1 is connected to the support 3, and the other end alternately passes around the pulleys of the fixed pulley block 5 and the movable pulley block 4. As a result, when the traction cylinder 6 drives the movable pulley block 4 to move, the length of the traction rope 1 between the pulley block and the support 3 changes accordingly. That is, the pulleys of the fixed pulley block 5 and the movable pulley block 4 are arranged in a one-to-one correspondence. The traction rope 1 first passes around one pulley of the movable fixed pulley block 5, then around a pulley in the movable pulley block 4, and then around another pulley in the movable pulley block 4. This process is repeated until the traction rope 1 has completely passed around all the pulleys of the fixed pulley block 5 and the movable pulley block 4.

[0068] The number of pulley groups can be set according to needs, and the number of pulleys in the movable pulley group 4 and the fixed pulley group 5 can also be set according to needs, which is not limited in this embodiment.

[0069] For example, each fixed pulley set 5 and each movable pulley includes 6 pulleys, so the movement between the movable pulley set 4 and the fixed pulley set 5 will be magnified to the supporting member 3 at a magnification of 12 times.

[0070] For example, two pulley groups are provided and are arranged on both sides of the traction cylinder 6. The traction rope 1 is wrapped around one pulley group and then around the other pulley group. The two movable pulley groups 4 are connected by a connecting frame, and the piston rod of the traction cylinder 6 is connected to the connecting frame, so that the two movable pulley groups 4 can move synchronously by only pushing the connecting frame to move.

[0071] It is understandable that when multiple pulley assemblies are provided, the traction rope 1 only needs to pass around all the pulley assemblies in sequence.

[0072] When the accelerated object 2 needs to be accelerated, the accelerated object 2 is carried by the carrier 3. When the accelerated object 2 is accelerated, the traction cylinder 6 is loaded, so that the movable pulley group 4 moves in the direction away from the fixed pulley group 5, so that the carrier 3 is pulled by the traction rope 1 and moves in the first direction X to accelerate the accelerated object 2. The acceleration condition can be adjusted by controlling the oil inlet speed of the traction cylinder 6, so that the acceleration process is adjustable. When the carrier 3 moves to the predetermined position and contacts the first connecting member 12a, it will be blocked by the first connecting member 12a and gradually decelerated, so that the accelerated object 2 on the carrier 3 moves rapidly in the X direction and flies out, and each moving component gradually decelerates to a stop.

[0073] In addition, the rod chamber of the traction cylinder 6 is the working oil chamber, and the rodless chamber is connected to the atmosphere. The piston rod of the traction cylinder 6 only bears tension, so the piston rod can be selected with a small diameter and light weight. The rod chamber has a large effective area and strong traction force, which can adapt to high-speed acceleration of large mass loads and improve the applicability of the ejection drive device.

[0074] In some possible embodiments, two pulley blocks are provided and are respectively arranged on both sides of the traction cylinder 6 , one end of the traction rope 1 is connected to the bearing member 3 , and the other end is connected to the bearing member 3 after passing through the two pulley blocks in sequence.

[0075] For example, the overall direction of the traction rope 1 is similar to a double-layer L-shape, and four first guide pulleys are provided. The direction of the traction rope 1 is guided by the four first guide pulleys and the pulley group, so that two parts of the supporting member 3 are connected to the traction rope 1, thereby improving the traction effect of the traction rope 1 on the supporting member 3.

[0076] For some possible implementations, see Figure 1 and Figure 4 As shown, the first drive assembly also includes two damping cylinders 7, a balancing wheel 802, a balancing bracket 8, a screw 804 and an adjusting mechanism 803. The two damping cylinders 7 are arranged in parallel on both sides of the balancing wheel 802. The balancing wheel 802 is rotatably set on the balancing bracket 8. The balancing bracket 8 is connected to the screw 804. The adjusting mechanism 803 is connected to the screw 804 to drive the screw 804 to push the balancing bracket 8 to move toward or away from the adjusting mechanism 803.

[0077] The traction rope 1 includes a first connecting section, a second connecting section and a third connecting section. One end of the first connecting section is connected to the supporting member 3, and the other end is connected to a pulley set and then connected to a damping cylinder 7. One end of the third connecting section is connected to the supporting member 3, and the other end is connected to another damping cylinder 7 after passing around another pulley set. One end of the second connecting section is connected to a damping cylinder 7, and the other end is connected to another damping cylinder 7 after passing around the balance wheel 802.

[0078] Specifically, when the accelerated object 2 is accelerated, the traction cylinder 6 will cause the tension of the traction rope 1 to suddenly increase, and the damping cylinder 7 can withstand the corresponding tension through mechanical limiting, ensuring that it can provide sufficient support for the load of the traction rope 1 and prevent the traction rope 1 from breaking due to excessive instantaneous load. At the same time, it can also ensure that the traction rope 1 will not loosen and fall off.

[0079] During use, the balance wheel 802 can rotate as the second connecting section moves, which can balance the tension at both ends of the traction rope 1, prevent the traction rope 1 from breaking due to uneven force at both ends, and provide better protection for the traction rope 1.

[0080] After long-term use, the traction rope 1 is prone to plastic elongation due to force, resulting in excessive initial retraction stroke of the damping cylinder 7, offset of the initial position of the support member 3 and other problems. At this time, the adjustment mechanism 803 can be used to drive the screw rod 804 to move in the first direction X to compensate for the plastic elongation of the traction rope 1.

[0081] It is understandable that the adjustment mechanism 803 may include a gear and a motor, or a gear and a handwheel, the gear is engaged with the screw rod 804, and the gear is driven to rotate by the motor or handwheel, thereby driving the screw rod 804 to drive the balance wheel 802 to move back and forth in the direction of approaching or moving away from the damping cylinder 7.

[0082] For some possible implementations, see Figure 3 As shown, the oil supply device also includes a first one-way valve 703, a second accumulator 702, a second reversing valve 704 and a first overflow valve 706, and a damping valve 705 connected in sequence. The damping valve 705 is connected to the second reversing valve 704 and the first overflow valve 706. The damping valve 705 and the first one-way valve 703 are also connected to the damping cylinder 7 so that the hydraulic oil in the second accumulator 702 can enter the damping cylinder 7 through the first one-way valve 703. The first overflow valve 706 is connected to the oil tank 23. It can be understood that all components are connected through pipelines for conveying hydraulic oil.

[0083] Specifically, the damping cylinder 7 has a rod chamber and a rodless chamber like a conventional cylinder. The second connecting section can be connected to the piston rod of the damping cylinder 7, or it can be connected to the end of the damping cylinder 7 away from the piston rod, while the first connecting section and the third connecting section can be connected to the other end of the damping cylinder 7 accordingly.

[0084] For example, the second connecting section is connected to the ends of the rodless chambers of the two damping cylinders 7 , and the first connecting section and the third connecting section are connected to the piston rods of the two damping cylinders 7 , respectively.

[0085] At this time, the first one-way valve 703 and the damping valve 705 are both connected to the rod chamber of the damping cylinder 7. When acceleration begins, the traction cylinder 6 is loaded, causing the tension of the traction rope 1 to suddenly increase. The damping cylinder 7 is passively extended under the pull of the traction rope 1, and the hydraulic oil in the rod chamber flows back to the second accumulator 702 through the damping valve 705 and the second reversing valve 704. Among them, the damping valve 705 can increase the pressure in the rod chamber when the damping cylinder 7 is passively extended, ensuring that it can provide sufficient support for the load of the traction rope 1, and prevent the traction rope 1 from breaking due to excessive instantaneous load.

[0086] After the accelerated object 2 is accelerated to a predetermined speed, the traction cylinder 6 is unloaded, causing the tension of the traction rope 1 to suddenly decrease. The hydraulic oil in the second accumulator 702 quickly enters the rod chamber of the damping cylinder 7 through the first one-way valve 703, causing the piston rod to retract quickly, thereby ensuring that the traction rope 1 will not loosen or fall off.

[0087] In addition, after all moving parts slow down to a stop, the traction rope 1 restores its tension, and the piston rod of the damping cylinder 7 further retracts to the middle position. During the entire acceleration process, the hydraulic oil will generate a large amount of heat after flowing into the second accumulator 702 through the damping valve 705, causing the temperature of the hydraulic oil to rise. At this time, the electromagnet of the second reversing valve 704 is controlled to be energized, so that the hydraulic oil in the second accumulator 702 flows back to the oil tank 23 through the second reversing valve 704. After the hot oil is drained, the electromagnet of the second reversing valve 704 is controlled to be de-energized. The hydraulic oil in the oil tank 23 passes through the first overflow valve 706 and the second reversing valve 704 to charge the second accumulator 702, and then returns to its initial state, waiting for the next acceleration.

[0088] It can be understood that one or more second accumulators 702 can be provided, and the specific selection can be made according to the pressure requirement, which is not limited in this embodiment.

[0089] In some possible embodiments, the oil supply device further includes at least one third accumulator 24, a main launch valve 25, a charging valve 26, an on-off valve 17, a boost tank 15, an oil drain valve 18, and at least one gas cylinder 16. The traction cylinder 6 is connected to the charging valve 26 and the main launch valve 25. The oil tank 23 is connected to the oil drain valve 18, the main launch valve 25, the third accumulator 24, and the on-off valve 17. The main launch valve 25 is also connected to the third accumulator 24. The top of the boost tank 15 is connected to the gas cylinder 16, and the bottom of the boost tank 15 is connected to the oil drain valve 18 and the charging valve 26. It will be understood that all components are connected via pipelines for conveying hydraulic oil.

[0090] Among them, the filling valve 26 is installed at the bottom of the boost tank 15, which can achieve the maximum oil replenishment capacity through the boost tank 15, and the gas cylinder 16 is connected to the top of the boost tank 15, which can effectively replenish the pressure of the boost tank 15 and ensure that the minimum pressure of the boost tank 15 can meet the requirements after the hydraulic oil is replenished to the outside. Among them, the pressure of the boost tank 15 is generally maintained at 3-5 bar.

[0091] It can be understood that when multiple gas cylinders 16 are set, each gas cylinder 16 is connected to the boost tank 15 through a pipeline, and the number of gas cylinders 16 can be set according to actual usage requirements, as long as the usage requirements of the boost tank 15 can be met. This embodiment will not be described in detail here.

[0092] It is understandable that multiple third accumulators 24 can also be provided to meet the acceleration requirements of the accelerated object 2. Of course, when multiple third accumulators 24 are provided, each third accumulator 24 is connected to the launch main valve 25 and the oil tank 23 through a pipeline. This embodiment does not limit the setting of the third accumulator 24.

[0093] Of course, the structures and working principles of the first accumulator 27 , the second accumulator 702 and the third accumulator 24 are well known to those skilled in the art, and will not be described in detail in this embodiment.

[0094] In addition, the oil drain valve 18 and the launch main valve 25 can both adopt at least one high-response two-way plug-in electro-hydraulic proportional throttle valve to achieve efficient adjustment of acceleration, and multiple two-way plug-in electro-hydraulic proportional throttle valves can be set in parallel to meet the regulation of large flow hydraulic oil, and the specific number can be adjusted according to actual conditions.

[0095] Furthermore, a liquid level sensor 14 can be provided to monitor the liquid level in the boost tank 15 in real time through the liquid level sensor 14, and to control the opening and closing of the drain valve 18 through the liquid level sensor 14, that is, when the liquid level sensor 14 detects that the liquid level in the boost tank 15 is lower than or equal to the preset liquid level, the drain valve 18 is in a closed state; when the liquid level sensor 14 detects that the liquid level in the boost tank 15 is higher than the preset liquid level, the drain valve 18 is in an open state to discharge excess hydraulic oil to the tank 23.

[0096] In addition, in order to ensure the oil supply pressure of the traction cylinder 6, the reset motor 1307, the driving cylinder, etc., taking the traction cylinder 6 as an example, a pump group consisting of a motor 20, an oil pump 21, a second one-way valve 19, and a second overflow valve 22 can be set on the connecting pipeline between the oil outlet end of the oil tank 23 and the switch valve 17, the launch main valve 25, and the third accumulator 24, that is, the oil inlet of the third accumulator 24, the switch valve 17, and the launch main valve 25 are connected through a pipeline, and the pipeline is connected to the second one-way valve 19, so that the hydraulic oil in the oil tank 23 can only enter the switch valve 17, the launch main valve 25, and the third accumulator 24 through the second one-way valve 19 under the action of the oil pump 21.

[0097] It can be understood that when multiple pump groups are provided, the multiple pump groups are provided in parallel between the oil tank 23 and the pipeline connecting the oil inlet of the third accumulator 24, the switch valve 17, and the launch main valve 25, and for each pump group, the second overflow valve 22 and the oil pump 21 are provided in parallel between the second one-way valve 19 and the oil tank 23, so that the drive system's requirements for the hydraulic oil flow can be met in this way.

[0098] Among them, the reset motor 1307, the driving cylinder, etc. are also arranged in the same way, that is, the oil inlet of the first accumulator 27 and the first reversing valve 29 are connected through a pipeline, and a pump group is arranged on the pipeline in the same way.

[0099] In addition, the specific number of pump groups is determined according to actual conditions, and this embodiment will not elaborate on it here. The oil tank 23 can be set as one or more. The reset motor 1307, traction cylinder 6, drive cylinder, and damping cylinder 7 can use the same oil tank 23 or different oil tanks 23. This embodiment does not limit it here.

[0100] For ease of understanding, the working principle of the ejection drive device provided in this embodiment is further described below with reference to the accompanying drawings:

[0101] In the initial state, such as Figure 1 and Figure 5As shown, the first clutch 1306b and the second clutch 1306a are both in a disengaged state. After the accelerated object 2 is mounted on the carrier 3, oil is supplied to the traction cylinder 6, causing the piston rod of the traction cylinder 6 to retract and drive the movable pulley group 4 to move toward the second direction Y. At this time, the distance between the movable pulley group 4 and the fixed pulley group 5 increases, and the traction rope 1 pulls the carrier 3 toward the first direction X at a multiple distance to accelerate the movement.

[0102] When the support member 3 reaches the predetermined position, the traction cylinder 6 is unloaded. Due to the inertia of the moving parts in the system, the piston rod of the movable pulley group 4 and the traction cylinder 6 still moves in the second direction Y. At this time, the support member 3 is connected to the first connecting member 12a, driving the first connecting member 12a to move in the first direction X, so that the first reset rope 12 drives the first drum shaft and the brake disc 1301 to rotate, and the first reset rope 12 wound on the first drum 1303 is released, and the brake 1302 is loaded, so that the brake block clamps the brake disc 1301. The friction force increases the rotational resistance of the brake disc 1301 and the first drum shaft, and the rotation speed gradually slows down, thereby gradually slowing down the moving parts such as the support member 3, the movable pulley group 4, and the piston rod of the traction cylinder 6. The connection between the accelerated object 2 and the support member 3 is automatically disconnected, and the accelerated object 2 continues to move rapidly in the first direction X and flies out, and the moving parts gradually slow down until they stop moving.

[0103] After all the moving parts stop moving, the driving device is reset. At this time, the brake 1302 is unloaded, the first clutch 1306b is engaged, and the reset motor 1307 rotates to drive the first drum shaft and the brake disc 1301 to rotate, so that the first drum 1303 rotates, the first reset rope 12 is gradually retracted, and the first connecting member 12a drives the supporting member 3 to move in the second direction Y. At this time, the traction rope 1 will also change its position with the movement of the supporting member 3, so that the piston rod of the movable pulley group 4 and the traction cylinder 6 moves in the first direction X, wherein the traction cylinder 6 is passively extended. When the first reset rope 12 passes through the predetermined position again, the first connecting member 12a will connect with the second connecting member 12b Then, the first connecting member 12a drives the second connecting member 12b to move in the second direction Y, and the second reset rope 11 wound on the second drum 1305 is released until the piston rod of the traction cylinder 6 is fully extended. After the supporting member 3 returns to the initial position, the second clutch 1306a engages, the first clutch 1306b disengages, and the second drum 1305 rotates in the opposite direction, so that the second connecting member 12b drives the first connecting member 12a to move in the first direction X. After the first connecting member 12a returns to the predetermined position, the reset motor 1307 stops rotating. At the same time, the first clutch 1306b and the second clutch 1306a are both disengaged, and the driving device returns to the initial state, ready for the next acceleration.

[0104] During use, the working principle of the oil supply device is as follows:

[0105] like Figure 2 As shown, before acceleration, each pump group is started to charge the first accumulator 27 and the third accumulator 24. At this time, the oil discharge valve 18 is in the left position and is fully closed. The switch valve 17 is in the right position so that the control oil port of the filling valve 26 is connected to the oil tank 23. The filling valve 26 is not actively opened. The launch main valve 25 is in the left position and is fully closed. The first reversing valve 29 is in the middle position. The pressure of the electric proportional pressure reducing valve 31 is set to 0.

[0106] When the accelerated object 2 begins to accelerate, the launch main valve 25 opens, and the high-pressure hydraulic oil in the pump group and the third accumulator 24 enters the traction cylinder 6 through the launch main valve 25, generating a pulling force, causing the accelerated object 2 to start accelerating toward the first direction X.

[0107] When the accelerated object 2 is accelerated to a predetermined speed, the main launch valve 25 is closed, the pulling force applied by the traction cylinder 6 to the movable pulley group 4 disappears, and the hydraulic oil in the booster tank 15 enters the traction cylinder 6 through the filling valve 26 to replenish oil to prevent air absorption. The electric proportional pressure reducing valve 31 controls the oil inlet pressure of the brake 1302 to gradually increase, and the braking force of the brake 1302 will also increase accordingly, so that the moving parts gradually slow down until they stop.

[0108] When resetting the drive system, the switch valve 17 is in the left position, so that the filling valve 26 is actively opened, the launch main valve 25 is in the left position and is fully closed, the pressure of the electric proportional pressure reducing valve 31 is set to 0, the clutch is engaged, the first reversing valve 29 is in the left position, and the high-pressure oil in the pump group and the first accumulator 27 enters the reset motor 1307 through the pressure reducing valve 28, the first reversing valve 29 and the one-way throttle valve 30. The reset motor 1307 rotates, driving the traction cylinder 6 to extend, and the hydraulic oil in the traction cylinder 6 is discharged through the filling valve 26 flows into the boost tank 15. When the liquid level in the boost tank 15 detected by the liquid level sensor 14 is lower than or equal to the preset liquid level, the drain valve 18 is in the closed state. When the liquid level is higher than the preset liquid level, the drain valve 18 opens to discharge the excess oil into the tank 23. After the traction cylinder 6 is fully extended, the first reversing valve 29 is in the right position, and the reset motor 1307 rotates in the opposite direction. After the transmission part reaches the specified position, the reversing valve is in the middle position, the clutch is disengaged, and the drive device returns to its initial state, ready for the next acceleration.

[0109] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0110] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A catapult drive device for driving a carrier (3) to move back and forth along a guide rail, wherein the carrier (3) is used to carry an accelerated object (2), characterized in that: The ejection drive device comprises: A traction rope (1) connected to the carrier (3); a first driving assembly connected to the traction rope (1) so that the traction rope (1) pulls the carrier (3) to move from an initial position toward a first direction; a first reset rope (12) having elasticity, and a first connecting member (12a) being provided on the first reset rope (12), wherein the first connecting member (12a) is used to connect with the carrier (3) when the carrier (3) moves to a predetermined position along the first direction, and as the carrier (3) moves toward the first direction, the first connecting member (12a) is also used to push the carrier (3) to move toward a second direction opposite to the first direction to the initial position; a second reset rope (11) having a second connecting member (12b) provided thereon, wherein the second connecting member (12b) is used for pushing the first connecting member (12a) to move toward the first direction to the predetermined position when the first connecting member (12a) pushes the bearing member (3) to move toward the second direction to the predetermined position; and a second driving assembly (13) configured to drive the first reset rope (12) to pull the first connecting member (12a) to move toward the second direction, and to change the resistance of the first connecting member (12a) to the movement of the first reset rope (12); the second driving assembly (13) is further configured to drive the second reset rope (11) to pull the second connecting member (12b) to move toward the first direction; The second driving assembly (13) comprises a first drum (1303), a first drum shaft, a second drum (1305) and a second drum shaft, wherein the first drum (1303) is mounted on the first drum shaft, and the second drum (1305) is mounted on the second drum shaft, one end of the first reset rope (12) is connected to the first connecting member (12a), and the other end is wound around the first drum (1303), and one end of the second reset rope (11) is connected to the second connecting member (12b), and the other end is wound around the second drum (1305); The second drive assembly (13) further includes at least one brake member, a first clutch (1306b), a second clutch (1306a), a transfer case (1308) and a reset motor (1307), wherein the brake member is mounted on the first reel shaft and is used to adjust the rotational resistance of the first reel shaft, the first clutch (1306b) is used to connect the transfer case (1308) and the first reel shaft, the second clutch (1306a) is used to connect the transfer case (1308) and the second reel shaft, and the transfer case (1308) is used to connect to the output end of the reset motor (1307) to transmit the power of the reset motor (1307) to the first clutch (1306b) and the second clutch (1306a).

2. The ejection drive device according to claim 1, characterized in that: The first reset rope (12) is a nylon rope.

3. The ejection drive device according to claim 1, characterized in that: The braking component includes a brake disc (1301) and a brake (1302), wherein the brake disc (1301) is fixed on the first reel shaft, and the brake (1302) includes two brake blocks and a driving cylinder, wherein the two brake blocks are respectively arranged on both sides of the brake disc (1301), and the driving cylinder is used to adjust the position of the brake blocks so that the brake blocks clamp or release the brake disc (1301).

4. The ejection drive device according to claim 3, characterized in that: The invention also includes an oil supply device, which includes an oil tank (23), a first reversing valve (29), an electric proportional pressure reducing valve (31) and at least one first accumulator (27); the reset motor (1307) is connected to the first reversing valve (29); the driving oil cylinder is connected to the electric proportional pressure reducing valve (31); the oil tank (23) is connected to the first accumulator (27) and the electric proportional pressure reducing valve (31); and the first accumulator (27) is also connected to the electric proportional pressure reducing valve (31) and the first reversing valve (29).

5. The ejection drive device according to claim 4, characterized in that: The first driving assembly comprises a traction cylinder (6) and at least one pulley group, wherein the pulley group comprises a fixed pulley group (5) and a movable pulley group (4), wherein the fixed pulley group (5) and the movable pulley group (4) each comprise at least two pulleys, and the traction cylinder (6) is used to drive the movable pulley group (4) to move toward or away from the fixed pulley group (5). One end of the traction rope (1) is connected to the bearing member (3), and the other end alternately passes around the pulleys of the fixed pulley group (5) and the movable pulley group (4).

6. The ejection drive device according to claim 5, characterized in that: The oil supply device further comprises at least one third accumulator (24), a launch main valve (25), a charging valve (26), a switch valve (17), a pressurized oil tank (15), an oil discharge valve (18) and at least one gas cylinder (16); the traction oil cylinder (6) is connected to the charging valve (26) and the launch main valve (25); the oil tank (23) is connected to the oil discharge valve (18), the launch main valve (25), the third accumulator (24) and the switch valve (17); the launch main valve (25) is also connected to the third accumulator (24); the top of the pressurized oil tank (15) is connected to the gas cylinder (16); and the bottom of the pressurized oil tank (15) is connected to the oil discharge valve (18) and the charging valve (26).

7. The ejection drive device according to claim 5 or 6, characterized in that: There are two pulley blocks, which are respectively arranged on both sides of the traction oil cylinder (6); one end of the traction rope (1) is connected to the bearing member (3), and the other end is connected to the bearing member (3) after passing through the two pulley blocks in sequence.

8. The ejection drive device according to claim 7, characterized in that: The first driving assembly further comprises two damping oil cylinders (7), a balancing wheel (802), a balancing bracket (8), a screw rod (804) and an adjusting mechanism (803), wherein the two damping oil cylinders (7) are arranged in parallel on both sides of the balancing wheel (802), the balancing wheel (802) is rotatably arranged on the balancing bracket (8), the balancing bracket (8) is connected to the screw rod (804), and the adjusting mechanism (803) is connected to the screw rod (804) to drive the screw rod (804) to push the balancing bracket (8) to move toward or away from the adjusting mechanism (803); The traction rope (1) includes a first connecting section, a second connecting section and a third connecting section. One end of the first connecting section is connected to the bearing member (3), and the other end is connected to one of the pulley blocks and then connected to one of the damping cylinders (7). One end of the third connecting section is connected to the bearing member (3), and the other end is connected to another of the pulley blocks and then connected to another of the damping cylinders (7). One end of the second connecting section is connected to one of the damping cylinders (7), and the other end is connected to another of the damping cylinders (7) after passing through the balancing wheel (802).

9. The ejection drive device according to claim 8, characterized in that: The oil supply device further comprises a first one-way valve (703), at least one second accumulator (702), a second reversing valve (704) and a first overflow valve (706), and a damping valve (705) connected in sequence. The damping valve (705) is connected to the second reversing valve (704) and the first overflow valve (706). The damping valve (705) and the first one-way valve (703) are both connected to the damping oil cylinder (7) so that the hydraulic oil in the second accumulator (702) can enter the damping oil cylinder (7) through the first one-way valve (703). The first overflow valve (706) is connected to the oil tank (23).

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