Winch hydraulic control system and operating machinery

Abstract

The present invention provides a winch hydraulic control system and an operating machine. The present invention relates to the field of winch control. A winch hydraulic control system comprises: a winch reducer having a first input end and a second input end, wherein the speed ratio of the first input end is smaller than the speed ratio of the second input end; a first motor is connected to the first input end, and the first motor drives the winch reducer to rotate in a first working mode; and a second motor is connected to the second input end, and the second motor drives the winch reducer to rotate in a second working mode. The winch hydraulic control system provided by the present invention realizes that the first input end with a low speed ratio is connected to the first motor through the winch reducer having the first input end and the second input end, so as to realize the rapid lifting and lowering of the winch in the first working mode, and the second input end with a high speed ratio is connected to the second motor, so as to realize the lifting and slow lowering of the winch in the second working mode, so as to achieve the second motor to operate stably during the extremely slow lowering of the winch.

Description

Technical Field

[0001] The present invention relates to the technical field of winch control, and in particular to a winch hydraulic control system and an operating machine. Background Art

[0002] A winch is a small and light lifting device that uses a drum to wind a wire rope or chain to lift or pull heavy objects. It is also called a winch. A winch can lift vertically, pull heavy objects horizontally or tilted. There are two types of winches: manual winches and electric winches. Electric winches are the main type now. It can be used alone or as a component of machinery for lifting, road construction, and mine hoisting. It is widely used because of its simple operation, large rope winding capacity, and easy relocation. It is mainly used for lifting or flat towing materials in construction, water conservancy projects, forestry, mining, docks, etc.

[0003] The winch structure is used in double-wheel slot milling machines, Xuanhua drilling rigs, cranes and other operating machines. For example, the double-wheel slot milling machine is an underground construction equipment that mainly uses the tool holder to break the rock or soil layer to dig deep slots. According to the construction requirements, the tool holder needs to accurately display its milling depth during the milling process. The tool holder is connected to the main machine through a wire rope and a winch wrapped with the wire rope. During the operation, the main machine controls the winch to rotate, thereby controlling the tool holder to mill downward.

[0004] During the milling process of the double-wheel slot milling machine, the feed speed of the working device is required to be slow and stable, and the maximum speed under slow working conditions is about 0.5m / min; when milling hard rock, the double-wheel slot milling machine may mill downward at a stable and extremely slow speed, generally less than 0.01m / min, otherwise it will cause the milling wheel to jam. The existing winch control system cannot achieve stable feed control when the double-wheel slot milling machine is milling at an extremely slow feed speed. Summary of the invention

[0005] The present invention provides a winch hydraulic control system and an operating machine, which are used to solve the defect that the winch control system in the prior art cannot achieve stable rotation at an extremely slow feeding speed, and adopts a dual-input winch reducer with different speed ratios at both ends, which is respectively connected to the first motor and the second motor in the two control circuits to achieve speed control requirements in different working modes, meet the extremely slow speed lowering requirements when the winch reducer drives the winch, and the second motor can still rotate stably.

[0006] The present invention provides a winch hydraulic control system, comprising:

[0007] A winch reducer: comprising a first input end and a second input end, wherein the speed ratio of the first input end is smaller than the speed ratio of the second input end;

[0008] A first control circuit includes a first motor connected to the first input end, and the first motor drives the winch reducer to rotate in the first working mode;

[0009] The second control loop includes a second motor connected to the second input end, and the second motor drives the winch reducer to rotate in the second working mode.

[0010] According to the winch hydraulic control system provided by the present invention, the second control circuit also includes a first pump source group connected in series with the second motor, and a throttling control component capable of regulating the hydraulic flow when driving the second motor to perform a lowering action.

[0011] According to the winch hydraulic control system provided by the present invention, the throttling control assembly includes a first speed regulating valve and a second speed regulating valve, wherein the first speed regulating valve and the second speed regulating valve are connected in parallel.

[0012] The first pump source group includes a first oil port and a second oil port, the second motor includes a third oil port and a fourth oil port, the first oil port is connected to the third oil port,

[0013] The first speed regulating valve and the second speed regulating valve are arranged between the second oil port and the fourth oil port.

[0014] According to the winch hydraulic control system provided by the present invention, the throttling control assembly includes a first one-way valve, and the first speed regulating valve and the second speed regulating valve are both connected in parallel with the first one-way valve.

[0015] The oil inlet of the first one-way valve is connected to the second oil port, and the oil outlet of the first one-way valve is connected to the fourth oil port.

[0016] According to the winch hydraulic control system provided by the present invention, the first control circuit also includes: a second pump source group connected in series with the first motor, and a balancing valve group capable of balancing the pressure difference at both ends of the first motor when performing a lowering action.

[0017] According to the winch hydraulic control system provided by the present invention, the balancing valve group includes a balancing valve and a second one-way valve, the second pump source group includes a seventh oil port and an eighth oil port, the first motor includes a fifth oil port and a sixth oil port,

[0018] The second one-way valve and the balance valve are connected in parallel between the eighth oil port and the sixth oil port, the oil inlet of the second one-way valve is connected to the eighth oil port, and the oil outlet of the second one-way valve is connected to the sixth oil port.

[0019] The control oil port of the balancing valve is connected to the oil circuit between the seventh oil port and the fifth oil port.

[0020] The hoisting hydraulic control system provided according to the present invention further includes a braking device, and the braking device is used to control the rotation and braking of the first input end and the second input end of the hoisting reducer.

[0021] According to the winch hydraulic control system provided by the present invention, the braking device includes a first brake cylinder and a second brake cylinder.

[0022] The first brake cylinder is used to release the brake of the first input end in the first working mode.

[0023] The second brake cylinder is used to release the brake of the second input end in the second working mode.

[0024] According to the winch hydraulic control system provided by the present invention, the displacement of the first motor is 10 to 30 times that of the second motor, and / or the speed ratio of the second input end is 10 to 30 times that of the first input end.

[0025] The present invention also provides an operating machine, comprising the above-mentioned winch hydraulic control system.

[0026] The beneficial effects of the present invention are:

[0027] The winch hydraulic control system provided by the present invention realizes two independent control loops to control the winch in two working modes through a winch reducer having a first input end and a second input end. The first input end with a low speed ratio is connected to the first motor of the first control loop to realize the rapid lifting and lowering of the winch in the first working mode, and the second input end with a high speed ratio is connected to the second motor of the second control loop to realize the lifting and slow lowering of the winch in the second working mode, and further achieves that the second motor can operate stably during the process of lowering the winch at an extremely slow speed.

[0028] Furthermore, in the working machine provided by the present invention, since it is provided with the hoisting hydraulic control system as described above, it also has the various advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is one of the hydraulic principle diagrams of the winch hydraulic control system provided by the present invention;

[0031] Figure 2 This is the second hydraulic principle diagram of the winch hydraulic control system provided by the present invention.

[0032] Reference numerals:

[0033] 100: winch reducer; 101: first input end; 102: second input end;

[0034] 200: first control circuit; 201: first motor; 202: first hydraulic pump; 203: first reversing valve; 204: balancing valve; 205: second check valve; 206: third overflow valve; 210: first oil inlet; 211: second oil inlet; 212: third oil inlet; 213: fifth oil port; 214: sixth oil port; 215: control oil port; 220: second pump source group; 221: seventh oil port; 222: eighth oil port; 230: balancing valve group;

[0035] 300: second control circuit; 301: second motor; 302: first pump source group; 303: first check valve; 304: throttling control assembly; 305: first overflow valve; 306: second overflow valve; 310: first speed regulating valve; 311: second speed regulating valve; 312: first oil port; 313: second oil port; 314: third oil port; 315: fourth oil port; 316: second hydraulic pump; 317: second reversing valve;

[0036] 400: braking device; 401: first brake cylinder; 402: second brake cylinder; 403: second hydraulic pump; 404: first reversing valve; 405: second reversing valve; 410: fourth oil inlet; 411: fifth oil inlet. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] Combine the following Figure 1 It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute a limitation on the present invention.

[0042] like Figure 1 As shown, the present invention provides a winch hydraulic control system, which is particularly applicable to a double-wheel slot milling machine, and controls the lifting, retraction, and slow feeding of the tool holder during the milling process. It can also be applied to other operating machines that require a large speed ratio change range and require an extremely low-speed stable lowering function. The winch hydraulic control system includes:

[0043] The winch reducer 100 comprises a first input terminal 101 and a second input terminal 102, wherein the speed ratio of the first input terminal 101 is smaller than the speed ratio of the second input terminal 102; the first control loop 200 comprises a first motor 201, wherein the first motor 201 is connected to the first input terminal 101, and the first motor 201 drives the winch reducer 100 to rotate in the first working mode; the second control loop 300 comprises a second motor 301, wherein the second motor 301 is connected to the second input terminal 102, and the second motor 301 drives the winch reducer 100 to rotate in the second working mode; wherein the flow rate of the first motor 201 is greater than that of the second motor 301.

[0044] Among them, the first motor 201 and the second motor 301 drive the winch reducer 100 to rotate forward and reverse, thereby realizing the lifting and lowering of the heavy object. One of the first motor 201 and the second motor 301 works to drive the winch reducer 100 to rotate. For example, in the process of the first motor 201 driving the winch reducer 100 to rotate forward and reverse, the first working mode, i.e., the rapid lifting and lowering of the winch, is realized. In the process of the second motor 301 driving the winch reducer 100 to rotate forward and reverse, the second working mode, i.e., the slow feeding of the winch, is realized.

[0045] Furthermore, the first input end 101 is an end with a low speed ratio, the second input end 102 is an end with a high speed ratio, the first motor 201 is a large displacement motor, and the second motor 301 is a small displacement motor. The low speed ratio winch reducer 100 with a large displacement motor can better control the rapid lifting and lowering of the winch. The high speed ratio winch reducer 100 with a small displacement motor can better control the slow feeding of the winch. During the slow feeding process of the winch, an extremely slow feeding speed and a very stable feeding state can be achieved. Among them, the extremely slow speed can reach a lowering speed of less than or equal to 0.01m / min.

[0046] In addition, by matching the winch reducer 100 with different speed ratios with motors of different displacements, the winch can be operated in two working modes: rapid lifting and lowering and slow feeding. Because each motor has a specific minimum stable speed limit in the actual working process, setting the second input terminal 102 with a high speed ratio can enable the second motor 301 to operate stably even in the minimum feeding state.

[0047] In an optional embodiment of the present invention, the displacement of the first motor 201 is 10 to 30 times that of the second motor 301 .

[0048] Further, in another optional embodiment of the present invention, the speed ratio of the second input end 102 is 10 to 30 times the speed ratio of the first input end 101. At the same time, the displacement of the first motor 201 can also be maintained to be 10 to 30 times the displacement of the second motor 301.

[0049] For example, the displacement of the first motor 201 is 20 times that of the second motor 301 , and the speed ratio of the second input end 102 is 20 times that of the first input end 101 , so that the lifting capacity at both ends of the winch reducer 100 can be the same.

[0050] Specifically, when the second motor 301 controls the winch reducer 100 to operate in the second working mode of slow feeding, in order to reduce the feeding speed, it is necessary to reduce the speed of the winch reducer 100. As shown in formula (1), the winch speed n is proportional to the input flow Q of the second motor 301, and inversely proportional to the displacement P of the second motor 301 and the speed ratio i of the winch reducer 100. Therefore, the second input end 102 of the present invention adopts a high speed ratio, that is, the speed ratio i of the winch reducer 100 is increased; by reducing the input flow Q of the second motor 301, the winch speed n can be effectively reduced, that is, the feeding speed can be reduced.

[0051] At the same time, in order to ensure the stable operation of the second motor 301, it is necessary to ensure that the ratio of the input flow Q of the second motor 301 to the displacement P of the second motor 301 is not too small, that is, the speed of the second motor 301 is not too small. Through the second input end 102 of the high-speed ratio of the winch reducer 100, when the input flow of the second motor 301 is small, the speed of the second motor 301 is increased, so that the speed of the second motor 301 can be not lower than the minimum stable speed of the second motor 301, and the stable rotation is maintained.

[0052] n=Q / Pi (1)

[0053] Continue to refer Figure 1 In an optional embodiment of the present invention, the second control circuit 300 also includes a first pump source group 302 connected in series with the second motor 301, and a throttling control component 304 capable of regulating the hydraulic flow when driving the second motor 301 to perform a lowering action.

[0054] Specifically, if Figure 1 As shown, for example, the first pump source group 302 is a closed pump. The closed pump includes a first oil port 312 and a second oil port 313, and the second motor 301 includes a third oil port 314 and a fourth oil port 315, the first oil port 312 is connected to the third oil port 314, and the second oil port 313 is connected to the fourth oil port 315.

[0055] Among them, in some embodiments of the present invention, the throttling control component 304 includes a first speed regulating valve 310 and a second speed regulating valve 311, the first speed regulating valve 310 is connected in parallel with the second speed regulating valve 311, the first pump source group 302 includes a first oil port 312 and a second oil port 313, the second motor 301 includes a third oil port 314 and a fourth oil port 315, the first oil port 312 is connected to the third oil port 314, and the first speed regulating valve 310 and the second speed regulating valve 311 are arranged between the second oil port 313 and the fourth oil port 315.

[0056] Further, in other embodiments of the present invention, the throttling control component 304 further includes a first one-way valve 303. The first speed regulating valve 310 and the second speed regulating valve 311 are both connected in parallel with the first one-way valve 303, the oil inlet of the first one-way valve 303 is connected with the second oil port 313, and the oil outlet of the first one-way valve 303 is connected with the fourth oil port 315.

[0057] For the lifting and slow feeding in the second working mode, the working state of the winch lifting is: the closed pump rotates forward, the second oil port 313 of the closed pump supplies oil to the fourth oil port 315 of the second motor 301, and the hydraulic oil output from the second oil port 313 opens the first check valve 303 and supplies oil to the fourth oil port 315. The hydraulic oil flows out from the third oil port 314 of the second motor 301 and returns to the first oil port 312 of the closed pump. The second motor 301 drives the winch reducer 100 to rotate through the second input end 102 of the high-speed ratio to realize the lifting process of the winch. The first check valve 303 keeps the load from falling freely due to gravity when lowering. The first speed regulating valve 310, the second speed regulating valve 311 and the first check valve 303 in parallel can achieve the effect of lifting without intercepting the flow and saving energy.

[0058] The winch slow feed working state: the closed pump reverses, the first oil port 312 of the closed pump supplies oil to the third oil port 314 of the second motor 301, the hydraulic oil enters the third oil port 314 from the first oil port 312, and then flows out from the fourth oil port 315 of the second motor 301, and flows back to the second oil port 313 of the closed pump through the throttling control component 304. The second motor 301 drives the winch reducer 100 to rotate through the second input end 102 of the high speed ratio, thereby realizing the slow lowering of the winch. Among them, the throttling control component 304 controls the maximum speed of the winch downward speed.

[0059] In an optional embodiment of the present invention, the throttling control assembly 304 includes a first speed regulating valve 310 and a second speed regulating valve 311 .

[0060] The lowering process of the winch is controlled in sections and stably by the first speed regulating valve 310 and the second speed regulating valve 311. For example, the second speed regulating valve 311 is closed, and the slow lowering is controlled by the opening of the first speed regulating valve 310 to obtain the first speed regulating range; the first speed regulating valve 310 is fully opened, and the lowering speed of the winch is controlled by controlling the opening of the second speed regulating valve 311 to obtain the second speed regulating range. The winch feed speed in the first speed regulating range is the slowest. The winch feed speed in the second speed regulating range is greater than the winch feed speed in the first speed regulating range.

[0061] Of course, by connecting multiple speed regulating valves in parallel, multiple winch lowering speed ranges can be obtained to achieve segmented control of the winch lowering speed. Among them, the first speed regulating valve 310 and the second speed regulating valve 311 can be electromagnetic speed regulating valves. It can be imagined that the purpose of the throttling control component 304 is to fine-control the input flow Q of the second motor 301. In other embodiments, a shunt speed regulation method can also be adopted instead of a cut-off method. Specifically, a proportional control shunt valve and an oil return oil circuit that bypasses the second motor 301 can be added to achieve the effect of shunt speed regulation.

[0062] In addition, the closed pump in this embodiment can be a closed plunger pump. A first overflow valve 305 and a second overflow valve 306 are provided at the first oil port 312 and the second oil port 313 of the closed pump to protect the closed pump. Compared with the pumping structure of an open pump with a reversing valve, the closed pump realizes hydraulic oil reversing regulation by forward and reverse rotation, thereby eliminating the reversing valve, reducing the pressure loss of the hydraulic channel, improving work efficiency, simplifying the system structure, and helping to compress the occupied space and reduce costs. In some other embodiments, an open pump with a reversing valve can be used.

[0063] Furthermore, the first speed regulating valve 310 and the second speed regulating valve 311 are electronic speed regulating valves. In order to achieve precise control of throttling adjustment, the throttling control component 304 may have a pressure compensator to further achieve precise flow control.

[0064] like Figure 2 As shown, the first pump source group 302 can be a second hydraulic pump 316 and a second reversing valve 317. Among them, the second reversing valve 317 can be a three-position four-way reversing valve. The oil inlet of the second hydraulic pump 316 is connected to the oil outlet of the oil tank, the oil outlet of the second hydraulic pump 316 is connected to the second reversing valve 317, and the working oil port of the second reversing valve 317 is respectively connected to the third oil port 314 of the second motor 301 and the fourth oil port 315 of the second motor 301. The oil return port of the second reversing valve 317 is connected to the oil inlet of the oil tank.

[0065] Continue to refer Figure 1In a specific embodiment of the present invention, the first control circuit 200 further includes: a second pump source group 220 connected in series with the first motor 201, and a balancing valve group 230 capable of balancing the pressure difference between the two ends of the first motor 201 when performing a lowering action.

[0066] The second pump source group 220 includes the first hydraulic pump 202 and the first reversing valve 203. In some embodiments of the present invention, the balancing valve group 230 includes a balancing valve 204 and a second one-way valve 205. The balancing valve 204 and the second one-way valve 205 keep the load from falling freely due to gravity when lowering. The second pump source group 220 includes the seventh oil port 221 and the eighth oil port 222, and the first motor 201 includes the fifth oil port 213 and the sixth oil port 214.

[0067] The second one-way valve 205 and the balance valve 204 are connected in parallel between the eighth oil port 222 and the sixth oil port 214 . The oil inlet of the second one-way valve 205 is connected to the eighth oil port 222 , and the oil outlet of the second one-way valve 205 is connected to the sixth oil port 214 .

[0068] Specifically, the first hydraulic pump 202 is connected to the first oil inlet 210 of the first reversing valve 203, the second oil inlet 211 of the first reversing valve 203 is connected to the fifth oil port 213 of the first motor 201, and the third oil inlet 212 of the first reversing valve 203 is connected to the sixth oil port 214 of the first motor 201. The oil outlet of the first reversing valve 203 is connected to the oil tank to achieve unloading.

[0069] Specifically, the first reversing valve 203 switches different working positions to realize the control of the forward and reverse rotation of the first motor 201. The first motor 201 drives the winch reducer 100 to rotate forward and reverse, driving the winch to lift up and lower.

[0070] Among them, the second one-way valve 205 and the balancing valve 204 are connected in parallel between the third oil inlet 212 and the sixth oil port 214, the oil inlet of the second one-way valve 205 is connected to the third oil inlet 212, the oil outlet of the second one-way valve 205 is connected to the sixth oil port 214, and the control oil port 215 of the balancing valve 204 is connected to the oil circuit between the second oil inlet 211 and the fifth oil port 213.

[0071] Furthermore, when the first reversing valve 203 is in the first working position, the hydraulic oil of the first hydraulic pump 202 enters the first oil inlet 210, and the first oil inlet 210 is connected to the third oil inlet 212. The hydraulic oil flows out from the third oil inlet 212 to open the second one-way valve 205, flows into the sixth oil port 214 of the first motor 201, flows out from the fifth oil port 213 of the first motor 201, enters the second oil port 313 of the first reversing valve 203, and the second oil port 313 is connected to the oil outlet of the first reversing valve 203 and flows back to the oil tank, so that the first motor 201 drives the winch reducer 100 to rotate and the winch is quickly lifted.

[0072] When the first reversing valve 203 is in the second working position, the hydraulic oil of the first hydraulic pump 202 enters the first oil inlet 210, the first oil inlet 210 is connected with the second oil inlet 211, and the hydraulic oil flows from the second oil inlet 211 into the fifth oil port 213 of the first motor 201, and flows out from the sixth oil port 214 of the first motor 201. The hydraulic oil flowing out of the sixth oil port 214 flows back to the third oil inlet 212 of the first reversing valve 203 through the balance valve 204, and then flows back to the oil tank. The first motor 201 drives the winch reducer 100 to rotate, and the winch is quickly lowered. A third overflow valve 206 is set on the oil circuit where the control oil port 215 of the balance valve 204 is located, and on the oil circuit where the sixth oil port 214 is located. The third overflow valve 206 is used to include the first motor 201.

[0073] In other optional embodiments of the present invention, the first reversing valve 203 is an electric proportional control directional valve. The first hydraulic pump 202 can be a plunger pump, and the first motor 201 and the second motor 301 can be variable motors.

[0074] Similarly, in other embodiments of the present invention, the first pump source group 302 may be a closed pump. The two oil ports of the closed pump are respectively connected to the fifth oil port 213 and the sixth oil port 214 of the first motor 201. This further simplifies the structure, reduces the pressure loss of the oil channel, improves the energy utilization efficiency, compresses the volume space, and reduces the cost.

[0075] Furthermore, in some embodiments of the present invention, the winch hydraulic control system further includes a brake device 400, which is used to control the rotation and braking of the first input end 101 and the second input end 102 of the winch reducer 100. For example, the brake device 400 can be one of hydraulic pilot brake, electric control brake, electro-hydraulic control brake or clutch on and off to realize the torque output control of the winch reducer 100.

[0076] Specifically, in a preferred embodiment of the present invention, the braking device 400 includes a first brake cylinder 401 and a second brake cylinder 402, wherein the first brake cylinder 401 is used to release the brakes of the first input terminal 101 and the first motor 201 in a first working mode, and the second brake cylinder 402 is used to release the brakes of the second input terminal 102 and the second motor 301 in a second working mode.

[0077] In other words, when the winch reducer 100 is not working, the first brake cylinder 401 and the second brake cylinder 402 both brake the first input terminal 101 and the second input terminal 102 of the winch reducer 100. When the first control loop 200 is working, the first brake cylinder 401 is turned on so that the first motor 201 can drive the first input terminal 101 to drive the winch reducer 100 to rotate. At the same time, the second brake cylinder 402 is still in a braking state, that is, the second motor 301 is not working, and the second motor 301 cannot drive the winch reducer 100.

[0078] In other words, when the second control circuit 300 is working, the second brake cylinder 402 is turned on, so that the second motor 301 drives the second input terminal 102 to drive the winch reducer 100 to rotate. At the same time, the first brake cylinder 401 is still in a braking state, that is, the first motor 201 does not work, and the first motor 201 cannot drive the winch reducer 100.

[0079] Furthermore, in another embodiment of the present invention, the braking device 400 includes a second hydraulic pump 403, a first reversing valve 404 and a second reversing valve 405, and the second hydraulic pump 403 is respectively connected to the fourth oil inlet 410 of the first reversing valve 404 and the fifth oil inlet 411 of the second reversing valve 405, wherein the first oil outlet of the first reversing valve 404 is connected to the first brake cylinder 401, and the second oil outlet of the second reversing valve 405 is connected to the second brake cylinder 402.

[0080] The first brake cylinder 401 and the second brake cylinder 402 are single-acting spring return cylinders. The first reversing valve 404 and the second reversing valve 405 can be electromagnetic reversing valves. The second hydraulic pump 403 supplies oil to the first reversing valve 404 and the second reversing valve 405. Before the first motor 201 of the first control circuit 200 works, the first reversing valve 404 is energized and the second reversing valve 405 is de-energized. The first brake cylinder 401 releases the brake on the first input terminal 101, thereby turning on the first hydraulic pump 202 to drive the first motor 201.

[0081] Similarly, before the second motor 301 of the second control circuit 300 works, the first reversing valve 404 is first de-energized and the second reversing valve 405 is energized. The second brake cylinder 402 releases the brake on the second input end 102, thereby opening the closed pump to drive the second motor 301.

[0082] The present invention also provides a working machine, comprising the winch hydraulic control system of the above embodiment, wherein the working machine may be a double-wheel slot milling machine.

[0083] The winch hydraulic control system provided by the present invention realizes two independent control loops to control the winch in two working modes through the winch reducer 100 having a first input terminal 101 and a second input terminal 102. The first input terminal 101 with a low speed ratio is connected to the large displacement motor of the first control circuit 200 to realize the rapid lifting and lowering of the winch in the first working mode, and the second input terminal 102 with a high speed ratio is connected to the small displacement motor of the second control circuit 300 to realize the lifting and slow lowering of the winch in the second working mode, and further achieves that the second motor 301 can operate stably during the process of lowering the winch at an extremely slow speed.

[0084] Furthermore, in the working machine provided by the present invention, since it is provided with the hoisting hydraulic control system as described above, it also has the various advantages as described above.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A winch hydraulic control system, characterized in that: include: A winch reducer: comprising a first input end and a second input end, wherein the speed ratio of the first input end is smaller than the speed ratio of the second input end; The first control circuit includes a first motor connected to the first input end, and the first motor drives the winch reducer to rotate in the first working mode; The second control circuit includes a second motor connected to the second input end, and the second motor drives the winch reducer to rotate in the second working mode; The second control circuit also includes a first pump source group connected in series with the second motor, and a throttling control component capable of regulating the hydraulic flow when driving the second motor to perform a lowering action; The throttling control assembly includes a first speed regulating valve, a second speed regulating valve and a first non-return valve, the first speed regulating valve is connected in parallel with the second speed regulating valve, the first pump source group includes a first oil port and a second oil port, the second motor includes a third oil port and a fourth oil port, the first oil port is connected to the third oil port, the first speed regulating valve and the second speed regulating valve are arranged between the second oil port and the fourth oil port; the first speed regulating valve and the second speed regulating valve are both connected in parallel with the first non-return valve, the oil inlet of the first non-return valve is connected to the second oil port, and the oil outlet of the first non-return valve is connected to the fourth oil port; The first control circuit further includes: a second pump source group connected in series with the first motor, and a balancing valve group capable of balancing the pressure difference between the two ends of the first motor when the first motor performs a lowering action; The balancing valve group includes a balancing valve and a second one-way valve, the second pump source group includes a seventh oil port and an eighth oil port, the first motor includes a fifth oil port and a sixth oil port, the second one-way valve and the balancing valve are connected in parallel between the eighth oil port and the sixth oil port, the oil inlet of the second one-way valve is connected to the eighth oil port, the oil outlet of the second one-way valve is connected to the sixth oil port, and the control oil port of the balancing valve is connected to the oil circuit between the seventh oil port and the fifth oil port.

2. The winch hydraulic control system according to claim 1, characterized in that: It also includes a braking device, which is used to control the rotation and braking of the first input end and the second input end of the hoisting reducer.

3. The winch hydraulic control system according to claim 2, characterized in that: The brake device comprises a first brake cylinder and a second brake cylinder. The first brake cylinder is used to release the brake of the first input end in the first working mode. The second brake cylinder is used to release the brake of the second input end in the second working mode.

4. The winch hydraulic control system according to any one of claims 1 to 3, characterized in that: The displacement of the first motor is 10 to 30 times the displacement of the second motor, and / or, The speed ratio of the second input port is 10 to 30 times the speed ratio of the first input port.

5. A working machine, characterized in that: The invention comprises the hoisting hydraulic control system according to any one of claims 1 to 4.

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