Cab overturning system

Abstract

A working port A of a flashlight combination pump is communicated with lower cavities of two sets of lifting oil cylinders and lower cavities of two sets of hydraulic locks through first pipelines, and a working port B of the flashlight combination pump is connected with upper cavities of the two sets of lifting oil cylinders through second pipelines. The manual and electric combined pump comprises a valve block, an oil tank and a motor pump assembly, the oil tank and the motor pump assembly are arranged on the two sides of the valve block, a valve sleeve is fixedly mounted in a first mounting cavity of the valve block, a manual pump assembly for pumping oil in the manual oil suction channel into the second oil channel is arranged on the valve block, and a distribution shaft is arranged in a second mounting cavity of the valve block. The distribution shaft is provided with a first distribution oil channel and a second distribution oil channel which are arranged in an isolated mode, the second distribution oil channel is communicated with the working port A and the working port B in a switching mode through the distribution shaft, a throttling block is arranged in the second distribution oil channel, and a throttling hole is formed in the throttling block. Therefore, the problem of potential safety hazards caused by sudden descending of the cab to a driver is solved.

Description

Technical Field

[0001] The invention relates to the technical field of rollover systems, and in particular to a cab rollover system. Background Art

[0002] In the current field of new energy commercial heavy-duty trucks, the cab flipping system includes a flashlight combination pump, a cab hydraulic lock and a lifting cylinder. In addition, the current cab flipping system has the following problems: 1. The oil return speed is too fast during the rotation (resetting) process of the flipping cab. In addition, the cab's own gravity when rotating can easily cause the cab to drop suddenly, which can easily cause safety hazards to the driver. Therefore, the existing flashlight combination pump needs to be improved; 2. The piston rod in the lifting cylinder extends and retracts too fast, and the speed of the cab flipping and resetting is also fast, which leads to unstable flipping and resetting of the cab and poor safety. Therefore, the existing lifting cylinder needs to be improved. Summary of the invention

[0003] The purpose of the present invention is to provide a cab flipping system, and the flipping system of the present invention is made safer by improving the hand-operated combined pump.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: a cab flipping system, including a hand-operated combination pump, two groups of hydraulic locks and two groups of lifting cylinders, the working port A of the hand-operated combination pump is connected to the lower chambers of the two groups of lifting cylinders and the lower chambers of the two groups of hydraulic locks through a first pipeline, the working port B of the hand-operated combination pump is connected to the upper chambers of the two groups of lifting cylinders through a second pipeline, the hand-operated combination pump includes a valve block and an oil tank and a motor pump assembly arranged on both sides of the valve block, the valve block is provided with a first installation cavity, a second installation cavity, a manual oil suction channel, an electric oil suction channel, a first oil channel, a second oil channel, a third oil channel, a working port A and a working port B, a valve sleeve is fixedly installed in the first installation cavity, one end of the first oil channel is connected to the oil tank through the manual oil suction channel, the other end of the first oil channel is connected to the second oil channel, and the first oil channel is provided with a third oil channel. A check valve, a manual pump assembly for pumping the oil in the manual oil suction channel into the second oil channel is provided on the valve block, the electric oil suction channel is connected to the second oil channel through the third oil channel, the motor pump assembly can drive the oil in the oil tank to be pumped to the second oil channel through the electric oil suction channel and the third oil channel, a second check valve is provided in the third oil channel, a distribution shaft is provided in the second installation cavity, the distribution shaft is provided with a first distribution oil channel and a second distribution oil channel arranged in isolation, the second oil channel is switched to connect working port A and working port B through the distribution shaft, when the second oil channel is connected to working port A through the first distribution oil channel, working port B is connected to the oil tank through the second distribution oil channel; when the second oil channel is connected to working port B through the first distribution oil channel, working port A is connected to the oil tank through the second distribution oil channel, a throttling block is provided in the second distribution oil channel, and a throttling hole is provided on the throttling block.

[0005] Further, the first pipeline includes connecting pipe a, connecting pipe b, connecting pipe c, connecting pipe d, a four-way pipe and a first three-way pipe, one end of connecting pipe a is connected to the working port A of the flashlight combination pump, the other end of connecting pipe a is connected to the four-way pipe, connecting pipe b is provided with two and connects the lower cavity of the lifting cylinder and the four-way pipe, one end of connecting pipe c is connected to the four-way pipe, and the other end is connected to the first three-way pipe, one end of the first three-way pipe is connected to the lower cavity of one of the hydraulic locks, one end of connecting pipe d is connected to the lower cavity of another hydraulic lock, and the other end of connecting pipe d is connected to the first three-way pipe.

[0006] Furthermore, the second pipeline includes a connecting pipe e, a connecting pipe f and a second three-way pipe, one end of the connecting pipe e is connected to the working port B of the flashlight combination pump, and the other end of the connecting pipe e is connected to the second three-way pipe. The connecting pipe f is provided with two and connects the upper chamber of the lifting cylinder and the second three-way pipe.

[0007] Furthermore, the manual pump assembly includes a valve stem slidably arranged on the valve sleeve, a manual valve rotatably connected to the valve stem, and a connecting rod rotatably connected to the manual valve, the other end of the connecting rod is rotatably connected to the valve block, and first sealing members are respectively provided on both sides of the valve sleeve for sealing with the valve stem.

[0008] Furthermore, the valve sleeve includes a first sleeve portion and a second sleeve portion, the first sleeve portion and the second sleeve portion are axially detachably fixedly connected as a whole, the second sleeve portion is provided with a valve cavity for accommodating a valve stem, the first oil passage includes an oil passage a and an oil passage b arranged in the first sleeve portion, one end of the oil passage a is connected to a manual oil suction passage, the other end of the oil passage a is connected to a valve cavity adjacent to one side of the first sleeve portion, one end of the oil passage b is connected to a valve cavity adjacent to the first sleeve portion, the other end of the oil passage b is connected to the second oil passage, the oil passage a and the oil passage b are respectively provided with a first check valve, when the manual valve drives the valve stem to rise, the oil in the oil tank is guided to the first check valve in the oil passage a, so that the oil enters the valve cavity, when the manual valve drives the valve stem to descend, the first check valve in the oil passage a is closed and the oil pressure in the valve cavity is guided to the first check valve in the oil passage b, so that the oil enters the second oil passage.

[0009] Furthermore, an annular gap is provided between the valve sleeve and the first installation cavity, and second sealing members are provided on both sides of the first installation cavity corresponding to the annular gap, respectively, and the oil passage b and the second oil passage are connected through the annular gap.

[0010] Furthermore, an auxiliary oil channel is provided in the valve block, one end of the auxiliary oil channel is connected to the working port B, the other end of the auxiliary oil channel is arranged on the other side of the working port A and corresponds to the working port A, and the first end of the second distribution oil channel and the second end of the first distribution oil channel are located on both sides of the same circumferential surface.

[0011] Furthermore, the lifting oil cylinder includes a cylinder barrel, a piston rod assembly slidably arranged in the cylinder barrel, and a valve seat fixed to the bottom of the cylinder barrel, the piston rod assembly includes a piston and a piston rod fixedly connected to the piston, the piston seals and divides the inner chamber of the cylinder barrel into an upper oil chamber and a lower oil chamber, the valve seat is provided with a fourth oil channel and a fifth oil channel arranged in isolation, one end of the fourth oil channel is connected to the first pipeline, and the other end of the fourth oil channel is connected to the lower oil chamber, the fourth oil channel is provided with a first valve port and a first pressure limiting component arranged at the first valve port, and the return oil pressure of the hydraulic oil in the lower oil chamber is limited by the first pressure limiting component, the outside of the cylinder barrel is connected to an oil pipe for connecting the upper oil chamber and the fifth oil channel, one end of the fifth oil channel is connected to the second pipeline, and the other end of the fifth oil channel is connected to the oil pipe, the fifth oil channel is provided with a second valve port and a second pressure limiting component arranged at the second valve port, and the return oil pressure of the hydraulic oil in the upper oil chamber is limited by the second pressure limiting component.

[0012] Furthermore, the first pressure limiting component includes a first blocking ball, a first elastic member A and a first elastic member B arranged on both sides of the first blocking ball, the first elastic member A provides an elastic force for the first blocking ball to move toward the side of blocking the first valve port, and the first elastic member B provides an elastic force for the first blocking ball to move toward the side of opening the first valve port. When the return oil pressure of the hydraulic oil in the lower oil chamber is greater than the set maximum return oil pressure, the first blocking ball will block the first valve port under the action of the oil pressure of the hydraulic oil and the first elastic member A.

[0013] Furthermore, the second pressure limiting assembly includes a second blocking ball, a second elastic member A and a second elastic member B arranged on both sides of the second blocking ball, the second elastic member A provides an elastic force for the second blocking ball to move toward the side of blocking the second valve port, and the second elastic member B provides an elastic force for the second blocking ball to move toward the side of opening the second valve port. When the return oil pressure of the hydraulic oil in the upper oil chamber is greater than the set maximum return oil pressure, the second blocking ball will block the second valve port under the action of the oil pressure of the hydraulic oil and the second elastic member A.

[0014] In summary, the present invention has the following beneficial effects: 1. The present invention provides a throttle block at the second oil distribution channel, which can effectively reduce the speed at which the oil in the lower chamber of the oil cylinder flows to the oil tank, thereby ensuring that the problem of the sudden drop of the cab causing safety hazards to the driver is solved; 2. The present invention greatly simplifies the oil circuit structure by designing the oil circuit of the valve block, making the structure of the handheld integrated pump more compact, and solving the problem of many oil leakage points and inconvenient processing of the handheld integrated pump; 3. The present invention can prevent the cab from flipping over or returning to its original position too quickly by setting the first pressure-limiting component and the second pressure-limiting component in the lifting cylinder, and at the same time has a good explosion-proof effect, effectively improving the working safety of the cab. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the oil circuit structure of the present invention.

[0017] Figure 3 It is a structural schematic diagram of the hand-electric combination pump of the present invention.

[0018] Figure 4 It is a front view of the hand-electric combination pump of the present invention.

[0019] Figure 5 It is a schematic diagram of the installation structure of the connecting shaft of the hand-electric combination pump of the present invention.

[0020] Figure 6 It is a cross-sectional view of the valve block of the hand-operated combination pump of the present invention.

[0021] Figure 7 The present invention Figure 6 Sectional view at point A.

[0022] Figure 8 The present invention Figure 6 Enlarged view of point B.

[0023] Fig. 9 It is a structural schematic diagram of the distribution shaft of the present invention.

[0024] Fig.10 It is a structural schematic diagram of the lifting cylinder of the present invention.

[0025] Fig.11 The present invention Fig.10 Sectional view at point C.

[0026] Fig.12 It is a cross-sectional view of the lifting cylinder of the present invention.

[0027] Fig.13 The present invention Fig.12 Enlarged view of point D.

[0028] Fig.14 It is a schematic structural diagram of the lock hook assembly of the hydraulic lock of the present invention when locked.

[0029] Fig.15 It is a schematic structural diagram of the lock hook assembly of the hydraulic lock of the present invention when it is unlocked.

[0030] In the figure: 10, hand-operated combination pump; 110, valve block; 111, first installation cavity; 112, second installation cavity; 1121, drain channel; 1122, ring groove; 1123, rubber part; 113, manual oil suction channel; 114, electric oil suction channel; 115, first oil channel; 1151, first check valve; 116, second oil channel; 117, third oil channel; 1171, second check valve; 118, working port A; 119, working port B; 1191, auxiliary oil channel; 120, oil tank; 12 1. Oil pumping device; 130. Motor pump assembly; 131. Connecting shaft; 140. Valve sleeve; 141. First sleeve; 1411. Oil passage a; 1412. Oil passage b; 142. Second sleeve; 1421. Valve cavity; 143. Annular gap; 150. Manual pump assembly; 151. Valve stem; 152. Manual valve; 153. Connecting rod; 160. Distribution shaft; 161. First distribution oil passage; 162. Second distribution oil passage; 163. Annular cavity; 164. Arc-shaped limit groove; 165. Handle; 166 , filter; 170, throttle block; 171, throttle hole; 180, limit rod; 190, switch assembly; 20, hydraulic lock; 21, cylinder module; 211, cylinder body; 212, piston rod; 22, lock body module; 221, sleeve; 222, lock hook assembly; 2221, mounting seat; 2222, lock hook; 223, return spring; 224, limit block; 30, lifting cylinder; 310, cylinder barrel; 311, upper oil chamber; 312, lower oil chamber; 320, piston rod assembly; 321, piston; 322, piston rod; 330, valve seat; 331, fourth oil passage; 3311, first valve port; 3312, oil passage c; 3313, oil passage d; 3314, oil passage e; 332, fifth oil passage; 3321, second valve port; 3322, oil passage f; 3323, oil passage g; 3324, oil passage h; 333, first pressure limiting assembly; 3331, first blocking ball; 3332, first elastic member A; 3333, first elastic member B; 3334, first sealing plug; 3335, first abutment block; 334, second pressure limiting assembly; 3341, second blocking ball; 3342, second elastic member A; 3343, second elastic member B; 3344, second sealing plug; 3345, second abutment block; 340, oil pipe; 350, guide sleeve; 40, first pipeline; 41, connecting pipe a; 42, connecting pipe b; 43, connecting pipe c; 44, connecting pipe d; 45, four-way pipe; 46, first three-way pipe; 50, second pipeline; 51, connecting pipe e; 52, connecting pipe f; 53, second three-way pipe. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] like Figure 1-Figure 15As shown, a cab flipping system includes a hand-held combination pump 10, two groups of hydraulic locks 20 and two groups of lifting cylinders 30. The working port A118 of the hand-held combination pump 10 is connected to the lower chambers of the two groups of lifting cylinders 30 and the lower chambers of the two groups of hydraulic locks 20 through a first pipeline 40. The working port B119 of the hand-held combination pump 10 is connected to the upper chambers of the two groups of lifting cylinders 30 through a second pipeline 50. When the hand-held combination pump 10 supplies oil to the lower chambers of the hydraulic locks 20 and the lower chambers of the lifting cylinders 30, the two groups of lifting cylinders 30 drive the cab to flip. The hydraulic locks 20 are used to limit the maximum flipping angle of the cab. When the hand-held combination pump 10 supplies oil to the upper chambers of the lifting cylinders 30, the two groups of lifting cylinders 30 drive the cab to reset, and the lock hooks of the hydraulic locks 20 are reset under the action of the springs.

[0033] The hydraulic lock 20 includes a cylinder module 21 and a lock body module 22 arranged at the upper end of the cylinder module 21, the cylinder module 21 includes a cylinder body 211 and a piston rod 212 slidably arranged in the cylinder body 211, the lock body module 22 includes a sleeve 221 connected to the upper end of the cylinder body 211, a lock hook assembly 222 arranged in the sleeve 221 and a reset spring 223 for driving the lock hook assembly 222 to reset, the lock hook assembly 222 includes a mounting seat 2221 and a lock hook 2222 rotatably connected to the mounting seat 2221, and a limit block 224 for limiting the rotation angle of the lock hook 2222 is provided in the sleeve 221. In the initial state, the piston column 212 of the cylinder module 21 is located in the cylinder body 211, and the lock hook assembly 222 is in the original position under the action of the return spring 223, and the lock hook is in a locked state; when the flashlight combination pump 10 controls the hydraulic oil in the oil tank 120 to pump oil to the lower ends of the connecting pipes c43 and d44, the piston column 212 moves toward the side of the sleeve 221 and drives the lock hook assembly 222 to move toward the side of the compression return spring 223, and the lock hook 2222 moves toward the unlocking side.

[0034] The hand-operated combination pump 10 includes a valve block 110, an oil tank 120 and a motor pump assembly 130 arranged on both sides of the valve block 110, and a switch component 190 for controlling the opening and closing of the motor pump assembly 130 is arranged on the valve block 110; a first installation cavity 111, a second installation cavity 112, a manual oil suction channel 113, an electric oil suction channel 114, a first oil channel 115, a second oil channel 116, a third oil channel 117, a working port A118 and a working port B119 are arranged in the valve block 110, a valve sleeve 140 is fixedly installed in the first installation cavity 111, one end of the first oil channel 115 is connected to the oil tank 120 through the manual oil suction channel 113, and the other end of the first oil channel 115 is connected to the second oil channel 116, and the third oil channel 117 is connected to the working port A118 and the working port B119. A first check valve 1151 is provided in an oil passage 115, and a manual pump assembly 150 is provided on the valve block 110 for pumping the oil in the manual oil suction passage 113 into the second oil passage 116. The electric oil suction passage 114 is connected to the second oil passage 116 through the third oil passage 117. The motor pump assembly 130 can drive the oil in the oil tank 120 to be pumped to the second oil passage 116 through the electric oil suction passage 114 and the third oil passage 117. A second check valve 1171 is provided in the third oil passage 117. Both the first check valve 1151 and the second check valve 1171 are press-in check valves. The purpose of the second check valve 1171 is to prevent the oil in the third oil passage 117 from flowing back into the electric oil suction passage 114.

[0035] A distribution shaft 160 is provided in the second installation cavity 112, and a handle 165 is provided at the outer end of the distribution shaft 160. The distribution shaft 160 is provided with a first distribution oil passage 161 and a second distribution oil passage 162 which are isolated from each other. The second oil passage 116 is switched to connect the working port A118 and the working port B119 through the distribution shaft 160. When the second oil passage 116 is connected to the working port A118 through the first distribution oil passage 161, the working port B119 is connected to the oil tank 120 through the second distribution oil passage 162; when the second oil passage 116 is connected to the working port B119 through the first distribution oil passage 161, the working port A118 is connected to the oil tank 120 through the second distribution oil passage 162. A throttling block 170 is provided in the second distribution oil passage 162, and a throttling hole 171 is provided on the throttling block 170. Specifically, a filter plate 166 is also provided in the second distribution shaft 160.

[0036] The first pipeline 40 includes a connecting pipe a41, a connecting pipe b42, a connecting pipe c43, a connecting pipe d44, a four-way pipe 45 and a first three-way pipe 46. One end of the connecting pipe a41 is connected to the working port A118 of the hand-held combination pump 10, and the other end of the connecting pipe a41 is connected to the four-way pipe 45. The connecting pipe b42 is provided with two and connects the lower cavity of the lifting cylinder 30 and the four-way pipe 45. One end of the connecting pipe c43 is connected to the four-way pipe 45, and the other end is connected to the first three-way pipe 46. One end of the first three-way pipe 46 is connected to the lower cavity of one of the hydraulic locks 20. One end of the connecting pipe d44 is connected to the lower cavity of another hydraulic lock 20, and the other end of the connecting pipe d44 is connected to the first three-way pipe 46.

[0037] The second pipeline 50 includes a connecting pipe e51, a connecting pipe f52 and a second three-way pipe 53. One end of the connecting pipe e51 is connected to the working port B119 of the hand-held combination pump 10, and the other end of the connecting pipe e51 is connected to the second three-way pipe 53. The connecting pipe f52 has two upper chambers that connect the lifting cylinder 30 and the second three-way pipe 53.

[0038] The manual pump assembly 150 includes a valve stem 151 slidably arranged on the valve sleeve 140, a manual valve 152 rotatably connected to the valve stem 151, and a connecting rod 153 rotatably connected to the manual valve 152, the other end of the connecting rod 153 is rotatably connected to the valve block 110, and first sealing members are respectively provided on both sides of the valve sleeve 140 and are sealed with the valve stem 151.

[0039] The valve sleeve 140 includes a first sleeve portion 141 and a second sleeve portion 142, the first sleeve portion 141 and the second sleeve portion 142 are detachably fixedly connected as a whole along the axial direction, the second sleeve portion 142 is provided with a valve cavity 1421 for accommodating the valve stem 151, the first oil passage 115 includes an oil passage a1411 and an oil passage b1412 provided in the first sleeve portion 141, one end of the oil passage a1411 is connected to the manual oil suction passage 113, the other end of the oil passage a1411 is connected to the valve cavity 1421 adjacent to one side of the first sleeve portion 141, one end of the oil passage b1412 is connected to the valve cavity 1421 adjacent to the first sleeve portion 141, and the oil passage a1411 is connected to the valve cavity 1421 adjacent to the first sleeve portion 141. The other end of b1412 is connected to the second oil passage 116, and the first check valve 1151 is respectively provided in the oil passage a1411 and the oil passage b1412. When the manual valve 152 drives the valve stem 151 to rise, the oil in the oil tank 120 is guided to the first check valve 1151 in the oil passage a1411, so that the oil enters the valve chamber 1421. When the manual valve 152 drives the valve stem 151 to descend, the first check valve 1151 in the oil passage a1411 is closed and the oil pressure in the valve chamber 1421 is guided to the first check valve 1151 in the oil passage b1412, so that the oil enters the second oil passage 116.

[0040] The oil passage a1411 and the oil passage b1412 are respectively provided with a first check valve 1151. When the manual valve 152 drives the valve stem 151 to rise, the oil in the oil tank 120 is guided to the first check valve 1151 in the oil passage a1411, so that the oil enters the valve chamber 1421. When the manual valve 152 drives the valve stem 151 to descend, the first check valve 1151 in the oil passage a1411 is closed and the oil pressure in the valve chamber 1421 is guided to the first check valve 1151 in the oil passage b1412, so that the oil enters the second oil passage 116. The first check valve 1151 in the oil passage a1411 prevents the oil in the valve chamber 1421 from flowing back into the oil passage a1411, and the first check valve 1151 in the oil passage b1412 prevents the oil in the second oil passage 116 from flowing back into the oil passage b1412.

[0041] An annular gap 143 is provided between the valve sleeve 140 and the first installation cavity 111 . Second sealing members are provided on both sides of the first installation cavity 111 corresponding to the annular gap 143 . The oil passage b1412 and the second oil passage 116 are connected via the annular gap 143 .

[0042] An auxiliary oil channel 1191 is provided in the valve block 110, one end of the auxiliary oil channel 1191 is connected to the working port B119, the other end of the auxiliary oil channel 1191 is arranged on the other side of the working port A118 and corresponds to the working port A118, and the first end of the second distribution oil channel 162 and the second end of the first distribution oil channel 161 are located on both sides of the same circumferential surface.

[0043] The first oil distribution passage 161 is obliquely disposed in the distribution shaft 160 . The distribution shaft 160 is provided with an annular cavity 163 communicating with the first oil distribution passage 161 . The annular cavity 163 is disposed at a position of the distribution shaft 160 adjacent to the second oil passage 116 .

[0044] The working principle of manual oil pumping of the present invention is as follows: when the distribution shaft 160 rotates to the first position, the second oil channel 116 is connected to the working port A118 through the first distribution oil channel 161, and the working port B119 is connected to the fourth oil channel 331, the second distribution channel and the oil tank 120 in sequence. At this time, the working port A118 is connected to the second oil channel 116, and the working port B119 is connected to the oil tank 120. When manual oil pumping is performed through the manual pump assembly 150, the hydraulic oil in the oil tank 120 enters the working port A118 through the manual oil suction channel 113, the oil channel a1411, the valve cavity 1421, the oil channel b1412, the annular gap 143, the second oil channel 116, and the first distribution oil channel 161. That is to say, at this time, the hydraulic oil enters the lower chamber of the oil cylinder. At the same time, the hydraulic oil in the upper chamber of the oil cylinder enters the oil tank through the working port B119, the fourth oil channel 331, the second distribution oil channel 162, and the throttle hole 171. 120, at this time, the cylinder extends forward; when the distribution shaft 160 rotates to the second position, the second oil channel 116 is connected to the working port B119 through the first distribution oil channel 161, and the working port A118 is connected to the oil tank 120 through the second distribution channel. At this time, the working port B119 is connected to the second oil channel 116, and the working port A118 is connected to the oil tank 120. When the manual oil is pumped by the manual pump assembly 150, the hydraulic oil in the oil tank 120 enters the working port B119 through the manual oil suction channel 113, the oil channel a1411, the valve cavity 1421, the oil channel b1412, the annular gap 143, the second oil channel 116, and the first distribution oil channel 161. That is to say, at this time, the hydraulic oil enters the upper chamber of the oil cylinder. At the same time, the hydraulic oil in the lower chamber of the oil cylinder enters the oil tank 120 through the working port A118, the second distribution oil channel 162, and the throttle hole 171. At this time, the cylinder retracts backward to its initial state.

[0045] The working principle of the electric oil pumping of the present invention is as follows: when the distribution shaft 160 rotates to the first position, the second oil channel 116 is connected to the working port A118 through the first distribution oil channel 161, and the working port B119 is connected to the fourth oil channel 331, the second distribution channel and the oil tank 120 in sequence. At this time, the working port A118 is connected to the second oil channel 116, and the working port B119 is connected to the oil tank 120. When the electric oil pump is performed through the motor pump assembly 130, the hydraulic oil in the oil tank 120 enters the working port A118 through the electric oil suction channel 114, the third oil channel 117, the second oil channel 116, and the first distribution oil channel 161. That is to say, the hydraulic oil enters the lower chamber of the oil cylinder at this time. At the same time, the hydraulic oil in the upper chamber of the oil cylinder enters the oil tank through the working port B119, the fourth oil channel 331, the second distribution oil channel 162, and the throttle hole 171. 120, at this time, the oil cylinder extends forward; when the distribution shaft 160 rotates to the second position, the second oil channel 116 is connected with the working port B119 through the first distribution oil channel 161, and the working port A118 is connected with the oil tank 120 through the second distribution channel. At this time, the working port B119 is connected with the second oil channel 116, and the working port A118 is connected with the oil tank 120. When the motor pump assembly 130 is used for electric oil pumping, the hydraulic oil in the oil tank 120 enters the working port B119 through the electric oil suction channel 114, the third oil channel 117, the second oil channel 116, and the first distribution oil channel 161. That is to say, at this time, the hydraulic oil enters the upper chamber of the oil cylinder. At the same time, the hydraulic oil in the lower chamber of the oil cylinder enters the oil tank 120 through the working port A118, the second distribution oil channel 162, and the throttle hole 171. At this time, the oil cylinder retracts backward to its initial state.

[0046] The lifting cylinder 30 includes a cylinder barrel 310, a piston rod assembly 320 slidably disposed in the cylinder barrel 310, and a valve seat 330 fixed to the bottom of the cylinder barrel 310. The piston rod assembly 320 includes a piston 321 and a piston rod 322 fixedly connected to the piston 321. A guide sleeve 350 is provided at the outer end of the cylinder barrel 310. The movable rod and the guide sleeve 350 are guided and slidably matched. The piston 321 seals and separates the inner chamber of the cylinder barrel 310 into an upper oil chamber 311 and a lower oil chamber 312. The valve seat 330 is provided with a fourth oil passage 331 and a fifth oil passage 332 that are isolated and disposed. One end of the fourth oil passage 331 is connected to the first pipeline 40, and the other end of the fourth oil passage 331 is connected to the lower oil chamber 312. The fourth oil passage 331 is provided with a first valve port 3311 and a first pressure limiting component 333 arranged at the first valve port 3311, and the return oil pressure of the hydraulic oil in the lower oil chamber 312 is limited by the first pressure limiting component 333. The cylinder barrel 310 is externally connected with an oil pipe 340 for connecting the upper oil chamber 311 and the fifth oil passage 332. One end of the fifth oil passage 332 is connected to the second pipeline 50, and the other end of the fifth oil passage 332 is connected to the oil pipe 340. The fifth oil passage 332 is provided with a second valve port 3321 and a second pressure limiting component 334 arranged at the second valve port 3321, and the return oil pressure of the hydraulic oil in the upper oil chamber 311 is limited by the second pressure limiting component 334.

[0047] Furthermore, the first pressure limiting component 333 includes a first blocking ball 3331, a first elastic member A3332 and a first elastic member B3333 arranged on both sides of the first blocking ball 3331, the first elastic member A3332 provides an elastic force for the first blocking ball 3331 to move toward the side of blocking the first valve port 3311, and the first elastic member B3333 provides an elastic force for the first blocking ball 3331 to move toward the side of opening the first valve port 3311. When the return oil pressure of the hydraulic oil in the lower oil chamber 312 is greater than the set maximum return oil pressure, the first blocking ball 3331 will block the first valve port 3311 under the action of the oil pressure of the hydraulic oil and the first elastic member A3332.

[0048] Furthermore, the second pressure limiting component 334 includes a second blocking ball 3341, a second elastic member A3342 and a second elastic member B3343 arranged on both sides of the second blocking ball 3341, the second elastic member A3342 provides an elastic force for the second blocking ball 3341 to move toward the side of blocking the second valve port 3321, and the second elastic member B3343 provides an elastic force for the second blocking ball 3341 to move toward the side of opening the second valve port 3321. When the return oil pressure of the hydraulic oil in the upper oil chamber 311 is greater than the set maximum return oil pressure, the second blocking ball 3341 will block the second valve port 3321 under the action of the oil pressure of the hydraulic oil and the second elastic member A3342.

[0049] Furthermore, the fourth oil passage 331 includes an oil passage c3312, an oil passage d3313 and an oil passage e3314, one end of the oil passage c3312 is connected to the working port A of the oil tank 120, the other end of the oil passage c3312 is connected to the oil passage d3313 through the first valve port 3311, the other end of the oil passage d3313 is provided with a first sealing plug 3334, one end of the oil passage e3314 is connected to the oil passage d3313, the other end of the oil passage e3314 is connected to the lower oil chamber 312, the first elastic member A3332 is abutted between the first sealing plug 3334 and the first blocking ball 3331, a first abutting block 3335 is provided in the oil passage c3312, one end of the first elastic member B3333 is abutted against the first blocking ball 3331, the other end of the first elastic member B3333 is abutted against the first abutting block 3335, and a first oil through hole is provided in the middle of the first abutting block 3335.

[0050] Furthermore, the fifth oil passage 332 includes an oil passage f3322, an oil passage g3323 and an oil passage h3324, one end of the oil passage f3322 is connected to the working port B of the oil tank 120, the other end of the oil passage f3322 is connected to the oil passage g3323 through the second valve port 3321, the other end of the oil passage g3323 is provided with a second sealing plug 3344, one end of the oil passage h3324 is connected to the oil passage g3323, the other end of the oil passage h3324 is connected to the upper oil chamber 311, the second elastic member A3342 is abutted between the second sealing plug 3344 and the second blocking ball 3341, a second abutting block 3345 is provided in the oil passage f3322, one end of the second elastic member B3343 is abutted against the second blocking ball 3341, the other end of the second elastic member B3343 is abutted against the second abutting block 3345, and a second oil through hole is provided in the middle of the second abutting block 3345.

[0051] In summary, the present invention has the following beneficial effects: 1. The present invention provides a throttle block 170 at the second oil distribution passage 162, which can effectively reduce the speed at which the oil in the lower chamber of the oil cylinder flows to the oil tank 120, thereby ensuring that the problem of a sudden drop in the cab causing a safety hazard to the driver is solved; 2. The present invention greatly simplifies the oil circuit structure by designing the oil circuit of the valve block 110, making the structure of the flashlight integrated pump more compact, and solving the problem of many oil leakage points and inconvenient processing of the flashlight integrated pump; 3. The present invention provides a first pressure limiting component 333 and a second pressure limiting component 334 in the lifting cylinder 30, thereby preventing the cab from turning over or returning to its original position too quickly, and at the same time having a good explosion-proof effect, thereby effectively improving the working safety of the cab.

[0052] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A cab flipping system, characterized in that: The invention comprises a hand-operated combination pump (10), two groups of hydraulic locks (20) and two groups of lifting oil cylinders (30); a working port A (118) of the hand-operated combination pump (10) is connected to the lower chambers of the two groups of lifting oil cylinders (30) and the lower chambers of the two groups of hydraulic locks (20) through a first pipeline (40); a working port B (119) of the hand-operated combination pump (10) is connected to the upper chambers of the two groups of lifting oil cylinders (30) through a second pipeline (50); the hand-operated combination pump (10) comprises a valve block (110) and an oil tank (120) and a motor pump assembly (130) arranged on both sides of the valve block (110); a first installation chamber (111) and a second installation chamber (119) are arranged in the valve block (110); The invention relates to a mounting chamber (112), a manual oil suction passage (113), an electric oil suction passage (114), a first oil passage (115), a second oil passage (116), a third oil passage (117), a working port A (118) and a working port B (119); a valve sleeve (140) is fixedly installed in the first mounting chamber (111); one end of the first oil passage (115) is connected to an oil tank (120) through the manual oil suction passage (113); the other end of the first oil passage (115) is connected to the second oil passage (116); a first check valve (1151) is provided in the first oil passage (115); and a valve block (110) is provided to transfer the oil in the manual oil suction passage (113) to the oil tank (120); The electric oil suction passage (114) is connected to the second oil passage (116) through the third oil passage (117); the motor pump assembly (130) can drive the oil in the oil tank (120) to be pumped to the second oil passage (116) through the electric oil suction passage (114) and the third oil passage (117); a second check valve (1171) is provided in the third oil passage (117); a distribution shaft (160) is provided in the second installation cavity (112); the distribution shaft (160) is provided with a first distribution oil passage (161) and a second distribution oil passage (162) which are isolated from each other; and the second oil passage (116) is provided with a first distribution oil passage (161) and a second distribution oil passage (162) which are isolated from each other. The working port A (118) and the working port B (119) are switched to be connected through the distribution shaft (160); a throttling block (170) is provided in the second distribution oil passage (162); a throttling hole (171) is provided on the throttling block (170); when the second oil passage (116) is connected to the working port A (118) through the first distribution oil passage (161), the working port B (119) is connected to the oil tank (120) through the second distribution oil passage (162); when the second oil passage (116) is connected to the working port B (119) through the first distribution oil passage (161), the working port A (118) is connected to the oil tank (120) through the second distribution oil passage (162).

2. A cab flipping system according to claim 1, characterized in that: The first pipeline (40) comprises a connecting pipe a (41), a connecting pipe b (42), a connecting pipe c (43), a connecting pipe d (44), a four-way pipe (45) and a first three-way pipe (46); one end of the connecting pipe a (41) is connected to the working port A (118) of the hand-held electric combination pump (10); the other end of the connecting pipe a (41) is connected to the four-way pipe (45); two connecting pipes b (42) are provided and connect the lower chamber of the lifting cylinder (30) and the four-way pipe (45); one end of the connecting pipe c (43) is connected to the four-way pipe (45) and the other end is connected to the first three-way pipe (46); one end of the first three-way pipe (46) is connected to the lower chamber of one of the hydraulic locks (20); one end of the connecting pipe d (44) is connected to the lower chamber of the other hydraulic lock (20); the other end of the connecting pipe d (44) is connected to the first three-way pipe (46).

3. A cab flipping system according to claim 2, characterized in that: The second pipeline (50) comprises a connecting pipe e (51), a connecting pipe f (52) and a second three-way pipe (53); one end of the connecting pipe e (51) is connected to a working port B (119) of the hand-held electric combination pump (10); the other end of the connecting pipe e (51) is connected to the second three-way pipe (53); the connecting pipe f (52) is provided with two connecting pipes and connects the upper chamber of the lifting cylinder (30) and the second three-way pipe (53).

4. A cab flipping system according to claim 1, characterized in that: The manual pump assembly (150) comprises a valve stem (151) slidably arranged on the valve sleeve (140), a manual valve (152) rotatably connected to the valve stem (151), and a connecting rod (153) rotatably connected to the manual valve (152), the other end of the connecting rod (153) being rotatably connected to the valve block (110), and first sealing members which are sealed with the valve stem (151) are respectively provided on both sides of the valve sleeve (140).

5. The cab flipping system according to claim 1, characterized in that: The valve sleeve (140) comprises a first sleeve portion (141) and a second sleeve portion (142), the first sleeve portion (141) and the second sleeve portion (142) are detachably fixedly connected to form a whole along the axial direction, the second sleeve portion (142) is provided with a valve cavity (1421) for accommodating a valve stem (151), the first oil passage (115) comprises an oil passage a (1411) and an oil passage b (1412) provided in the first sleeve portion (141), one end of the oil passage a (1411) is connected to the manual oil suction passage (113), the other end of the oil passage a (1411) is connected to the valve cavity (1421) adjacent to one side of the first sleeve portion (141), one end of the oil passage b (1412) is connected to the valve cavity (1421) adjacent to the first sleeve portion (141), and the oil passage a (1411) is connected to the valve cavity (1421) adjacent to the first sleeve portion (141). The other end of the oil passage a (1411) is connected to the second oil passage (116). The oil passage a (1411) and the oil passage b (1412) are respectively provided with a first check valve (1151). When the manual valve (152) drives the valve stem (151) to rise, the oil in the oil tank (120) is conducted to the first check valve (1151) in the oil passage a (1411), so that the oil enters the valve chamber (1421). When the manual valve (152) drives the valve stem (151) to descend, the first check valve (1151) in the oil passage a (1411) is closed and the oil pressure in the valve chamber (1421) is conducted to the first check valve (1151) in the oil passage b (1412), so that the oil enters the second oil passage (116).

6. A cab flipping system according to claim 5, characterized in that: An annular gap (143) is provided between the valve sleeve (140) and the first installation cavity (111), and second sealing members are provided on both sides of the first installation cavity (111) corresponding to the annular gap (143), respectively. The oil passage b (1412) and the second oil passage (116) are connected via the annular gap (143).

7. A cab flipping system according to claim 6, characterized in that: An auxiliary oil passage (1191) is provided in the valve block (110), one end of the auxiliary oil passage (1191) is connected to the working port B (119), the other end of the auxiliary oil passage (1191) is arranged on the other side of the working port A (118) and corresponds to the working port A (118), and the first end of the second distribution oil passage (162) and the second end of the first distribution oil passage (161) are located on both sides of the same circumferential surface.

8. A cab flipping system according to any one of claims 1 to 7, characterized in that: The lifting cylinder (30) comprises a cylinder barrel (310), a piston rod assembly (320) slidably disposed in the cylinder barrel (310), and a valve seat (330) fixed to the bottom of the cylinder barrel (310); the piston rod assembly (320) comprises a piston (321) and a piston rod (322) fixedly connected to the piston (321); the piston (321) seals and separates the inner chamber of the cylinder barrel (310) into an upper oil chamber (311) and a lower oil chamber (312); a fourth oil passage (331) and a fifth oil passage (332) are isolated and disposed in the valve seat (330); one end of the fourth oil passage (331) is connected to the first pipeline (40), and the other end of the fourth oil passage (331) is connected to the lower oil chamber (312). The fourth oil passage (331) is provided with a first valve port (3311) and a first pressure limiting component (333) arranged at the first valve port (3311), and the return oil pressure of the hydraulic oil in the lower oil chamber (312) is limited by the first pressure limiting component (333); the cylinder barrel (310) is externally connected with an oil pipe (340) for connecting the upper oil chamber (311) and the fifth oil passage (332); one end of the fifth oil passage (332) is connected to the second pipeline (50), and the other end of the fifth oil passage (332) is connected to the oil pipe (340); the fifth oil passage (332) is provided with a second valve port (3321) and a second pressure limiting component (334) arranged at the second valve port (3321), and the return oil pressure of the hydraulic oil in the upper oil chamber (311) is limited by the second pressure limiting component (334).

9. A cab flipping system according to claim 8, characterized in that: The first pressure limiting component (333) includes a first blocking ball (3331), a first elastic member A (3332) and a first elastic member B (3333) arranged on both sides of the first blocking ball (3331), the first elastic member A (3332) providing an elastic force for the first blocking ball (3331) to move toward the side of blocking the first valve port (3311), and the first elastic member B (3333) providing an elastic force for the first blocking ball (3331) to move toward the side of opening the first valve port (3311), when the return oil pressure of the hydraulic oil in the lower oil chamber (312) is greater than the set maximum return oil pressure, the first blocking ball (3331) will block the first valve port (3311) under the action of the oil pressure of the hydraulic oil and the first elastic member A (3332).

10. The cab flipping system according to claim 8, characterized in that: The second pressure limiting component (334) includes a second blocking ball (3341), a second elastic member A (3342) and a second elastic member B (3343) arranged on both sides of the second blocking ball (3341), the second elastic member A (3342) providing an elastic force for the second blocking ball (3341) to move toward the side of blocking the second valve port (3321), and the second elastic member B (3343) providing an elastic force for the second blocking ball (3341) to move toward the side of opening the second valve port (3321), when the return oil pressure of the hydraulic oil in the upper oil chamber (311) is greater than the set maximum return oil pressure, the second blocking ball (3341) will block the second valve port (3321) under the action of the oil pressure of the hydraulic oil and the second elastic member A (3342).

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