A cab tilting system

Abstract

This invention discloses a cab tilting system. The working port A of a hand-operated combined pump is connected to the lower chambers of two sets of lifting cylinders and the lower chambers of two sets of hydraulic locks via a first pipeline. The working port B of the hand-operated combined pump is connected to the upper chambers of the two sets of lifting cylinders via a second pipeline. The hand-operated combined pump includes a valve block and an oil tank and motor pump assembly disposed on both sides of the valve block. A valve sleeve is fixedly installed in the first mounting cavity of the valve block. The valve block is equipped with a manual pump assembly that pumps oil from the manual suction channel into the second oil passage. A distribution shaft is provided in the second mounting cavity of the valve block. The distribution shaft has a first distribution oil passage and a second distribution oil passage that are isolated from each other. The second oil passage connects working port A and working port B via the distribution shaft. A throttling block is provided in the second distribution oil passage, and the throttling block has a throttling orifice. Through the above configuration, the speed at which oil flows from the lower chamber of the cylinder to the oil tank can be effectively reduced, thereby ensuring that the problem of sudden cab descent causing safety hazards to the driver is solved.

Description

Technical Field

[0001] This invention relates to the technical field of tilting systems, and particularly to a cab tilting system. Background Technology

[0002] Currently, in the field of new energy commercial heavy-duty trucks, the cab tilting system includes a hand-operated electric combination pump, a cab hydraulic lock, and a lifting cylinder. However, the current cab tilting system has the following problems: 1. During the cab rotation (and repositioning process), the return oil speed is too fast. Combined with the cab's own weight during rotation, this can easily cause the cab to drop suddenly, posing a safety hazard to the driver. Therefore, the existing hand-operated electric combination pump needs improvement; 2. The piston rod in the lifting cylinder extends and retracts too quickly, resulting in a correspondingly fast cab tilting and repositioning speed. This leads to unstable cab tilting and repositioning, resulting in poor safety. Therefore, the existing lifting cylinder needs improvement. Summary of the Invention

[0003] The purpose of this invention is to provide a cab tilting system, which improves the safety of the tilting system by improving the electric combination pump.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a cab tilting system, comprising a hand-operated combination pump, two sets of hydraulic locks, and two sets of lifting cylinders. The working port A of the hand-operated combination pump is connected to the lower chambers of the two sets of lifting cylinders and the lower chambers of the two sets 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 sets 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 disposed on both sides of the valve block. The valve block is provided with a first mounting cavity, a second mounting cavity, a manual oil suction channel, an electric oil suction channel, a first oil passage, a second oil passage, a third oil passage, a working port A, and a working port B. A valve sleeve is fixedly installed in the first mounting cavity. One end of the first oil passage is connected to the oil tank through the manual oil suction channel, and the other end of the first oil passage is connected to the second oil passage. The first oil passage is provided with a first... A check valve is provided. The valve block is equipped with a manual pump assembly that pumps the oil in the manual suction channel into the second oil channel. The electric suction channel is connected to the second oil channel through a 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 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 mounting cavity. The distribution shaft has a first distribution oil channel and a second distribution oil channel that are isolated from each other. The second oil channel switches between 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. The throttling block has a throttling orifice.

[0005] Furthermore, 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 hand-held electric combination pump, and the other end of connecting pipe a is connected to the four-way pipe. Connecting pipe b is provided in two parts and connects the lower chamber of the lifting cylinder to 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 chamber of one of the hydraulic locks. One end of connecting pipe d is connected to the lower chamber 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 tee pipe. One end of the connecting pipe e is connected to the working port B of the hand-held electric combination pump, and the other end of the connecting pipe e is connected to the second tee pipe. There are two connecting pipes f, which connect the upper chamber of the lifting cylinder to the second tee pipe.

[0007] Furthermore, the manual pump assembly includes a valve stem slidably disposed on a 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 a valve block, and a first sealing element is provided on both sides of the valve sleeve to seal against the valve stem.

[0008] Furthermore, the valve sleeve includes a first sleeve portion and a second sleeve portion, which are detachably and fixedly connected as a whole along the axial direction. The second sleeve portion is provided with a valve cavity for accommodating the valve stem. The first oil passage includes oil passage a and oil passage b disposed in the first sleeve portion. One end of oil passage a is connected to the manual oil suction channel, and the other end of oil passage a is connected to the valve cavity adjacent to the first sleeve portion. One end of oil passage b is connected to the valve cavity adjacent to the first sleeve portion, and the other end of oil passage b is connected to the second oil passage. A first check valve is respectively disposed in oil passage a and oil passage b. When the manual valve drives the valve stem to rise, the oil in the oil tank is guided through the first check valve in oil passage a to allow the oil to enter the valve cavity. When the manual valve drives the valve stem to fall, the first check valve in oil passage a is closed, and the oil pressure in the valve cavity is guided through the first check valve in oil passage b to allow the oil to enter the second oil passage.

[0009] Furthermore, an annular gap is provided between the valve sleeve and the first mounting cavity, and second sealing elements are respectively provided on both sides of the annular gap in the first mounting cavity. The oil passage b and the second oil passage are connected through the annular gap.

[0010] Furthermore, the valve block is provided with an auxiliary oil passage. One end of the auxiliary oil passage is connected to the working port B, and the other end of the auxiliary oil passage is located on the other side of the working port A and is corresponding to the working port A. The first end of the second distribution oil passage and the second end of the first distribution oil passage are located on opposite sides of the same circumference.

[0011] Furthermore, the lifting cylinder includes a cylinder barrel, a piston rod assembly slidably disposed within 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 passage and a fifth oil passage that are isolated from each other. One end of the fourth oil passage is connected to a first pipeline, and the other end of the fourth oil passage is connected to the lower oil chamber. The fourth oil passage is provided with a first valve port and a first pressure limiting component disposed at the first valve port. The first pressure limiting component limits the return oil pressure of the hydraulic oil in the lower oil chamber. An oil pipe for connecting the upper oil chamber and the fifth oil passage is connected to the outside of the cylinder barrel. One end of the fifth oil passage is connected to a second pipeline, and the other end of the fifth oil passage is connected to an oil pipe. The fifth oil passage is provided with a second valve port and a second pressure limiting component disposed at the second valve port. The second pressure limiting component limits the return oil pressure of the hydraulic oil in the upper oil chamber.

[0012] Furthermore, the first pressure limiting component includes a first plug ball, a first elastic element A and a first elastic element B disposed on both sides of the first plug ball. The first elastic element A provides elastic force for the first plug ball to move toward the side that blocks the first valve port, and the first elastic element B provides elastic force for the first plug ball to move toward the side that opens 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 plug ball will block the first valve port under the action of the hydraulic oil pressure and the first elastic element A.

[0013] Furthermore, the second pressure limiting component includes a second plug ball, a second elastic element A and a second elastic element B disposed on both sides of the second plug ball. The second elastic element A provides elastic force for the second plug ball to move toward the side that blocks the second valve port, and the second elastic element B provides elastic force for the second plug ball to move toward the side that opens 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 plug ball will block the second valve port under the action of the hydraulic oil pressure and the second elastic element A.

[0014] In summary, the present invention has the following beneficial effects:

[0015] 1. The present invention provides a throttling block at the second distribution oil passage, which can effectively reduce the speed at which the oil in the lower chamber of the 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.

[0016] 2. This invention greatly simplifies the oil circuit structure by designing the oil circuit of the valve block, making the structure of this hand-held electric integrated pump more compact and solving the problem of multiple oil leakage points and inconvenient processing in the hand-held electric integrated pump;

[0017] 3. By installing a first pressure limiting component and a second pressure limiting component inside the lifting cylinder, the present invention can prevent the cab from overturning or returning to its original position too quickly, while also providing good explosion protection and effectively improving the working safety of the cab. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the oil circuit structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the hand-flash pump combination of the present invention.

[0021] Figure 4 This is a front view of the hand-flash pump combination of the present invention.

[0022] Figure 5 This is a schematic diagram of the installation structure of the connecting shaft of the electric hand-flash pump of the present invention.

[0023] Figure 6 This is a cross-sectional view of the valve block of the hand-held electric combination pump of the present invention.

[0024] Figure 7 This is the invention Figure 6 Sectional view at point A.

[0025] Figure 8 This is the invention Figure 6 Enlarged view of point B.

[0026] Figure 9 This is a schematic diagram of the distribution shaft of the present invention.

[0027] Figure 10 This is a schematic diagram of the lifting cylinder of the present invention.

[0028] Figure 11 This is the invention Figure 10 Sectional view at point C.

[0029] Figure 12 This is a cross-sectional view of the lifting cylinder of the present invention.

[0030] Figure 13 This is the invention Figure 12 Enlarged view of point D.

[0031] Figure 14 This is a schematic diagram of the locking hook assembly of the hydraulic lock of the present invention when locked.

[0032] Figure 15 This is a schematic diagram of the locking hook assembly of the hydraulic lock of the present invention when it is unlocked.

[0033] In the diagram: 10. Hand-held electric combination pump; 110. Valve block; 111. First mounting cavity; 112. Second mounting cavity; 1121. Drainage channel; 1122. Annular groove; 1123. Rubber part; 113. Manual oil suction channel; 114. Electric oil suction channel; 115. First oil passage; 1151. First check valve; 116. Second oil passage; 117. Third oil passage; 1171. Second check valve; 118. Working port A; 119. Working port B; 1191. Auxiliary oil passage; 120. Oil tank; 12 1. Oiling 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 chamber; 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 limiting groove; 165. Handle; 166. 170. Filter element; 171. Throttling block; 180. Throttling orifice; 190. Limiting rod; 20. Switch assembly; 21. Hydraulic lock; 22. Cylinder module; 211. Cylinder body; 212. Piston rod; 22. Lock body module; 221. Sleeve; 222. Lock hook assembly; 2221. Mounting base; 2222. Lock hook; 223. Return spring; 224. Limiting 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 plug ball; 3332. First elastic element A; 3333. First elastic element B; 3334. First sealing plug; 3335. First abutment block; 334. Second pressure limiting component; 3341. Second plug; 3342. Second elastic element A; 3343. Second elastic element 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 tee pipe; 50. Second pipeline; 51. Connecting pipe e; 52. Connecting pipe f; 53. Second tee pipe. Detailed Implementation

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] like Figures 1-15As shown, a cab tilting system includes a hand-operated combination pump 10, two sets of hydraulic locks 20, and two sets of lifting cylinders 30. The working port A118 of the hand-operated combination pump 10 is connected to the lower chambers of the two sets of lifting cylinders 30 and the lower chambers of the two sets of hydraulic locks 20 through a first pipeline 40. The working port B119 of the hand-operated combination pump 10 is connected to the upper chambers of the two sets of lifting cylinders 30 through a second pipeline 50. When the hand-operated 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 sets of lifting cylinders 30 drive the cab to tilt. The hydraulic locks 20 are used to limit the maximum tilting angle of the cab. When the hand-operated combination pump 10 supplies oil to the upper chambers of the lifting cylinders 30, the two sets of lifting cylinders 30 drive the cab to reset. The locking hooks of the hydraulic locks 20 are reset under the action of springs.

[0036] The hydraulic lock 20 includes a cylinder module 21 and a lock body module 22 disposed on the upper end of the cylinder module 21. The cylinder module 21 includes a cylinder body 211 and a piston rod 212 slidably disposed 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 disposed in the sleeve 221, and a return spring 223 for driving the lock hook assembly 222 to reset. The lock hook assembly 222 includes a mounting base 2221 and a lock hook 2222 rotatably connected to the mounting base 2221. A limiting block 224 is provided in the sleeve 221 to limit the rotation angle of the lock hook 2222. In the initial state, the piston rod 212 of the cylinder module 21 is located inside the cylinder body 211, and the locking hook assembly 222 is in its original position under the action of the return spring 223. At this time, the locking hook is in the locked state. When the hand-held electric combination pump 10 controls the hydraulic oil in the oil tank 120 to pump oil to the lower end of the connecting pipe c43 and the connecting pipe d44, the piston rod 212 moves towards the sleeve 221 and drives the locking hook assembly 222 to move towards the compression return spring 223. At this time, the locking hook 2222 moves towards the unlocking side.

[0037] The hand-held electric combination pump 10 includes a valve block 110, an oil tank 120 disposed on both sides of the valve block 110, and a motor pump assembly 130. The valve block 110 is equipped with a switch assembly 190 for controlling the opening and closing of the motor pump assembly 130. The valve block 110 contains a first mounting cavity 111, a second mounting cavity 112, a manual oil suction channel 113, an electric oil suction channel 114, a first oil passage 115, a second oil passage 116, a third oil passage 117, a working port A118, and a working port B119. A valve sleeve 140 is fixedly installed in the first mounting cavity 111. One end of the first oil passage 115 is connected to the oil tank 120 through the manual oil suction channel 113, and 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 an oil passage 115. A manual pump assembly 150 is provided on the valve block 110 to pump the oil in the manual oil suction channel 113 into the second oil passage 116. An electric oil suction channel 114 is connected to the second oil passage 116 through a third oil passage 117. A 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 channel 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 pressure-operated 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 channel 114.

[0038] The second mounting cavity 112 is provided with a distribution shaft 160. The outer end of the distribution shaft 160 is provided with a handle 165. The distribution shaft 160 is provided with a first distribution oil passage 161 and a second distribution oil passage 162 that are isolated from each other. The second oil passage 161 switches between working port A118 and working port B119 through the distribution shaft 160. When the second oil passage 116 is connected to working port A118 through the first distribution oil passage 161, working port B119 is connected to oil tank 120 through the second distribution oil passage 162. When the second oil passage 116 is connected to working port B119 through the first distribution oil passage 161, working port A118 is connected to oil tank 120 through the second distribution oil passage 162. The second distribution oil passage 162 is provided with a throttling block 170 and a throttling orifice 171. Specifically, the second distribution shaft 160 is also provided with a filter 166.

[0039] The first pipeline 40 includes connecting pipe a41, connecting pipe b42, connecting pipe c43, connecting pipe d44, four-way pipe 45, and first three-way pipe 46. One end of connecting pipe a41 is connected to the working port A118 of the electric combination pump 10, and the other end of connecting pipe a41 is connected to four-way pipe 45. There are two connecting pipes b42, which connect the lower chamber of the lifting cylinder 30 to four-way pipe 45. One end of connecting pipe c43 is connected to four-way pipe 45, and the other end is connected to first three-way pipe 46. One end of first three-way pipe 46 is connected to the lower chamber of one of the hydraulic locks 20. One end of connecting pipe d44 is connected to the lower chamber of another hydraulic lock 20, and the other end of connecting pipe d44 is connected to first three-way pipe 46.

[0040] 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 electric combination pump 10, and the other end of the connecting pipe e51 is connected to the second three-way pipe 53. There are two connecting pipes f52, which connect the upper chamber of the lifting cylinder 30 to the second three-way pipe 53.

[0041] The manual pump assembly 150 includes a valve stem 151 slidably disposed on a 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 a valve block 110. The valve sleeve 140 is provided with a first sealing element on both sides, which is sealed to the valve stem 151.

[0042] 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 and fixedly connected as a single unit 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 disposed within the first sleeve portion 141. One end of the oil passage a1411 is connected to the manual oil suction channel 113, and the other end of the oil passage a1411 is connected to the valve cavity 1421 adjacent to 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. The other end of b1412 is connected to the second oil passage 116. The oil passages a1411 and b1412 are respectively equipped with first check valves 1151. When the manual valve 152 drives the valve stem 151 to rise, the oil in the oil tank 120 is guided through 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 fall, the first check valve 1151 in the oil passage a1411 is closed, and at the same time, the oil pressure in the valve chamber 1421 is guided through the first check valve 1151 in the oil passage b1412 so that the oil enters the second oil passage 116.

[0043] First check valves 1151 are respectively installed in oil passages a1411 and b1412. When the manual valve 152 drives the valve stem 151 to rise, the oil in the oil tank 120 is directed to the first check valve 1151 in oil passage a1411, so that the oil enters the valve chamber 1421. When the manual valve 152 drives the valve stem 151 to fall, the first check valve 1151 in oil passage a1411 closes, and the oil pressure in the valve chamber 1421 is directed to the first check valve 1151 in oil passage b1412, so that the oil enters the second oil passage 116. The first check valve 1151 in oil passage a1411 prevents the oil in the valve chamber 1421 from flowing back into oil passage a1411, and the first check valve 1151 in oil passage b1412 prevents the oil in the second oil passage 116 from flowing back into oil passage b1412.

[0044] An annular gap 143 is provided between the valve sleeve 140 and the first mounting cavity 111. The first mounting cavity 111 is provided with second sealing elements on both sides of the annular gap 143. The oil passage b1412 and the second oil passage 116 are connected through the annular gap 143.

[0045] The valve block 110 is provided with an auxiliary oil passage 1191. One end of the auxiliary oil passage 1191 is connected to the working port B119, and the other end of the auxiliary oil passage 1191 is located on the other side of the working port A118 and is corresponding to the working port A118. The first end of the second distribution oil passage 162 and the second end of the first distribution oil passage 161 are located on the same circumference.

[0046] The first distribution oil passage 161 is inclinedly disposed within the distribution shaft 160. The distribution shaft 160 is provided with an annular cavity 163 that communicates with the first distribution oil passage 161. The annular cavity 163 is disposed on the distribution shaft 160 near the second oil passage 116.

[0047] The working principle of manual oil pumping in this invention is as follows: When the distribution shaft 160 rotates to the first position, 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 fourth oil passage 331, the second distribution flow passage, and the oil tank 120 in sequence. At this time, the working port A118 is connected to the second oil passage 116, and the working port B119 is connected to the oil tank 120. When oil is manually pumped by 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, oil passage a1411, valve chamber 1421, oil passage b1412, annular gap 143, second oil passage 116, and first distribution oil passage 161. That is to say, at this time, the hydraulic oil enters the lower chamber of the cylinder. At the same time, the hydraulic oil in the upper chamber of the cylinder enters the oil tank through the working port B119, the fourth oil passage 331, the second distribution oil passage 162, and the throttle orifice 171. 120. At this time, the cylinder extends forward. When the distribution shaft 160 rotates to the second position, the second oil passage 116 is connected to the working port B119 through the first distribution oil passage 161, and the working port A118 is connected to the oil tank 120 through the second distribution flow channel. At this time, the working port B119 is connected to the second oil passage 116, and the working port A118 is connected to the oil tank 120. When the oil is manually 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, oil passage a1411, valve chamber 1421, oil passage b1412, annular gap 143, second oil passage 116, and first distribution oil passage 161. That is to say, at this time, the hydraulic oil enters the upper chamber of the cylinder. At the same time, the hydraulic oil in the lower chamber of the cylinder enters the oil tank 120 through the working port A118, second distribution oil passage 162, and throttle hole 171. At this time, the cylinder retracts back to the initial state.

[0048] The working principle of the electric oil pumping of this invention is as follows: When the distribution shaft 160 rotates to the first position, 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 fourth oil passage 331, the second distribution flow passage, and the oil tank 120 in sequence. At this time, the working port A118 is connected to the second oil passage 116, and the working port B119 is connected to the oil tank 120. When the electric pump assembly 130 pumps oil, the hydraulic oil in the oil tank 120 enters the working port A118 through the electric suction channel 114, the third oil passage 117, the second oil passage 116, and the first distribution oil passage 161. That is to say, at this time, the hydraulic oil enters the lower chamber of the cylinder. At the same time, the hydraulic oil in the upper chamber of the cylinder enters the oil tank through the working port B119, the fourth oil passage 331, the second distribution oil passage 162, and the throttle orifice 171. 120. At this time, the cylinder extends forward. When the distribution shaft 160 rotates to the second position, the second oil passage 116 is connected to the working port B119 through the first distribution oil passage 161, and the working port A118 is connected to the oil tank 120 through the second distribution flow channel. At this time, the working port B119 is connected to the second oil passage 116, and the working port A118 is connected to the oil tank 120. When the hydraulic oil is electrically pumped by the motor pump assembly 130, the hydraulic oil in the oil tank 120 enters the working port B119 through the electric suction channel 114, the third oil passage 117, the second oil passage 116, and the first distribution oil passage 161. That is to say, at this time, the hydraulic oil enters the upper chamber of the cylinder. At the same time, the hydraulic oil in the lower chamber of the cylinder enters the oil tank 120 through the working port A118, the second distribution oil passage 162, and the throttle hole 171. At this time, the cylinder retracts back to the initial state.

[0049] The lifting cylinder 30 includes a cylinder 310, a piston rod assembly 320 slidably disposed within the cylinder 310, and a valve seat 330 fixed to the bottom of the cylinder 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 310, and the movable rod slides and guides the guide sleeve 350. The piston 321 seals and divides the inner chamber of the cylinder 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 from each other. 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 passage. The lower oil chamber 312 has a first valve port 3311 and a first pressure limiting component 333 located at the first valve port 3311. The first pressure limiting component 333 limits the return pressure of the hydraulic oil in the lower oil chamber 312. The cylinder 310 is externally connected to 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 has a second valve port 3321 and a second pressure limiting component 334 located at the second valve port 3321. The second pressure limiting component 334 limits the return pressure of the hydraulic oil in the upper oil chamber 311.

[0050] Furthermore, the first pressure limiting component 333 includes a first plug ball 3331, a first elastic element A3332 and a first elastic element B3333 disposed on both sides of the first plug ball 3331. The first elastic element A3332 provides elastic force for the first plug ball 3331 to move toward the side blocking the first valve port 3311, and the first elastic element B3333 provides elastic force for the first plug ball 3331 to move toward the side 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 plug ball 3331 will block the first valve port 3311 under the action of the hydraulic oil pressure and the first elastic element A3332.

[0051] Furthermore, the second pressure limiting component 334 includes a second plug ball 3341, a second elastic element A3342 and a second elastic element B3343 disposed on both sides of the second plug ball 3341. The second elastic element A3342 provides elastic force for the second plug ball 3341 to move toward the side blocking the second valve port 3321, and the second elastic element B3343 provides elastic force for the second plug ball 3341 to move toward the side 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 plug ball 3341 will block the second valve port 3321 under the pressure of the hydraulic oil and the action of the second elastic element A3342.

[0052] Further, the fourth oil passage 331 includes oil passage c3312, oil passage d3313 and oil passage e3314. One end of oil passage c3312 is connected to the working port A of oil tank 120, and the other end of oil passage c3312 is connected to oil passage d3313 through the first valve port 3311. The other end of oil passage d3313 is provided with a first sealing plug 3334. One end of oil passage e3314 is connected to oil passage d3313, and the other end of 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 plug ball 3331. A first abutting block 3335 is provided in oil passage c3312. One end of the first elastic member B3333 is abutted against the first plug ball 3331, and the other end of the first elastic member B3333 is abutted against the first abutting block 3335. The first abutting block 3335 is provided with a first oil passage hole in the middle.

[0053] Further, the fifth oil passage 332 includes oil passage f3322, oil passage g3323 and oil passage h3324. One end of oil passage f3322 is connected to the working port B of oil tank 120, and the other end of oil passage f3322 is connected to oil passage g3323 through the second valve port 3321. The other end of oil passage g3323 is provided with a second sealing plug 3344. One end of oil passage h3324 is connected to oil passage g3323, and the other end of 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 plug ball 3341. A second abutting block 3345 is provided in oil passage f3322. One end of the second elastic member B3343 is abutted against the second plug ball 3341, and the other end of the second elastic member B3343 is abutted against the second abutting block 3345. The second abutting block 3345 is provided with a second oil passage hole in the middle.

[0054] In summary, the present invention has the following beneficial effects:

[0055] 1. The present invention provides a throttling block 170 at the second distribution oil 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 the sudden drop of the cab causing safety hazards to the driver is solved.

[0056] 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 hand-held electric integrated pump more compact and solving the problem of multiple oil leakage points and inconvenient processing in the hand-held electric integrated pump.

[0057] 3. By setting a first pressure limiting component 333 and a second pressure limiting component 334 inside the lifting cylinder 30, the present invention can prevent the cab from overturning or returning to its original position too quickly, while also providing good explosion protection and effectively improving the working safety of the cab.

[0058] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A cab rollover system characterized by: The utility model provides a hand lamp combination pump (10), two groups of hydraulic lock (20) and two groups of lifting oil cylinder (30), the working port A (118) of hand lamp combination pump (10) is connected with the lower chamber of two groups of lifting oil cylinder (30) and the lower chamber of two groups of hydraulic lock (20) through first pipeline (40), the working port B (119) of hand lamp combination pump (10) is connected with the upper chamber of two groups of lifting oil cylinder (30) through second pipeline (50), and hand lamp combination pump (10) includes valve block (110) and the oil tank (120) and motor pump assembly (130) set up on the both sides of valve block (110), and the first installation chamber (111) is set up in valve block (110), the second installation chamber (112), the manual oil suction passage (113), the electric oil suction passage (114), the first oil channel (115), the second oil channel (116), the third oil channel (117), the working port A (118) and the working port B (119), the valve sleeve (140) is fixedly installed in the first installation chamber (111), one end of first oil channel (115) is communicated with oil tank (120) through manual oil suction passage (113), the other end of first oil channel (115) is communicated with second oil channel (116), and first oil channel (115) is equipped with first check valve (1151), and the manual pump assembly (150) that the oil in manual oil suction passage (113) is hit into second oil channel (116) is equipped on valve block (110), electric oil suction passage (114) is communicated with second oil channel (116) through third oil channel (117), and motor pump assembly (130) can drive the oil in oil tank (120) and pump to second oil channel (116) through electric oil suction passage (114), third oil channel (117), and second check valve (1171) is equipped in third oil channel (117), and the distribution shaft (160) is equipped in the second installation chamber (112), and the distribution shaft (160) is equipped with the first distribution oil channel (161) and the second distribution oil channel (162) of isolated setting, and second oil channel (116) is communicated with working port A (118) and working port B (119) through distribution shaft (160) switching, the second distribution oil channel (162) is equipped with throttle block (170), throttle block (170) is equipped with throttle hole (171), when second oil channel (116) is communicated with working port A (118) through first distribution oil channel (161), working port B (119) is communicated with oil tank (120) through second distribution oil channel (162), when second oil channel (116) is communicated with working port B (119) through first distribution oil channel (161), working port A (118) is communicated with oil tank (120) through second distribution oil channel (162).

2. A cab roll-over system according to claim 1, characterised 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 with the working port A (118) of the hand and electric combined pump (10), the other end of the connecting pipe a (41) is connected with the four-way pipe (45), the connecting pipe b (42) is provided with two and is connected with the lower cavity of the lifting oil cylinder (30) and the four-way pipe (45), one end of the connecting pipe c (43) is communicated with the four-way pipe (45), the other end is connected with the first three-way pipe (46), one end of the first three-way pipe (46) is communicated with the lower cavity of one of the hydraulic locks (20), one end of the connecting pipe d (44) is connected with the lower cavity of the other hydraulic lock (20), the other end of the connecting pipe d (44) is connected with the first three-way pipe (46).

3. A cab roll-over system according to claim 2, characterised 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 with the working port B (119) of the hand and electric combined pump (10), the other end of the connecting pipe e (51) is connected with the second three-way pipe (53), the connecting pipe f (52) is provided with two and is connected with the upper cavity of the lifting oil cylinder (30) and the second three-way pipe (53).

4. A cab rollover system according to claim 1, characterized in that: The hand pump assembly (150) comprises a valve rod (151) slidingly arranged in the valve sleeve (140), a hand valve (152) rotatably connected with the valve rod (151) and a connecting rod (153) rotatably connected with the hand valve (152), the other end of the connecting rod (153) is rotatably connected with the valve block (110), the two sides of the valve sleeve (140) are respectively provided with a first sealing element sealingly arranged with the valve rod (151).

5. A cab rollover system according to claim 1, characterized in that: The valve sleeve (140) comprises a first sleeve part (141) and a second sleeve part (142), the first sleeve part (141) and the second sleeve part (142) are detachably fixed and connected in one body in the axial direction, the second sleeve part (142) is provided with a valve cavity (1421) for accommodating a valve rod (151), the first oil passage (115) comprises an oil passage a (1411) and an oil passage b (1412) arranged in the first sleeve part (141), one end of the oil passage a (1411) is communicated with the manual oil suction channel (113), the other end of the oil passage a (1411) is communicated with the valve cavity (1421) adjacent to one side of the first sleeve part (141), one end of the oil passage b (1412) is communicated with the valve cavity (1421) adjacent to the first sleeve part (141), the other end of the oil passage b (1412) is communicated with 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 rod (151) to rise, the oil in the oil tank (120) is guided to the first check valve (1151) in the oil passage a (1411), so that the oil enters the valve cavity (1421), when the manual valve (152) drives the valve rod (151) to descend, the first check valve (1151) in the oil passage a (1411) is closed, and the oil pressure in the valve cavity (1421) guides the first check valve (1151) in the oil passage b (1412), so that the oil enters the second oil passage (116).

6. A cab tipper system according to claim 5 wherein: The valve sleeve (140) and the first mounting cavity (111) are provided with an annular gap (143), the first mounting cavity (111) is provided with a second sealing member on both sides corresponding to the annular gap (143), the oil passage b (1412) and the second oil passage (116) are communicated through the annular gap (143).

7. A cab tipper system according to claim 6 wherein: The valve block (110) is provided with an auxiliary oil passage (1191), one end of the auxiliary oil passage (1191) is communicated with 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), 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 circumference.

8. A cab tipper system according to any one of claims 1 to 7, characterised in that: The lifting oil cylinder (30) comprises a cylinder barrel (310), a piston rod assembly (320) slidingly arranged 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 divides the inner cavity of the cylinder barrel (310) into an upper oil cavity (311) and a lower oil cavity (312), the valve seat (330) is provided with a fourth oil channel (331) and a fifth oil channel (332) arranged in isolation, one end of the fourth oil channel (331) is communicated with the first pipeline (40), the other end of the fourth oil channel (331) is communicated with the lower oil cavity (312), the fourth oil channel (331) is provided with a first valve port (3311) and a first pressure limiting assembly (333) arranged at the first valve port (3311), the first pressure limiting assembly (333) limits the return oil pressure of the hydraulic oil in the lower oil cavity (312), the cylinder barrel (310) is externally connected with an oil pipe (340) for communicating the upper oil cavity (311) and the fifth oil channel (332), one end of the fifth oil channel (332) is communicated with the second pipeline (50), the other end of the fifth oil channel (332) is communicated with the oil pipe (340), the fifth oil channel (332) is provided with a second valve port (3321) and a second pressure limiting assembly (334) arranged at the second valve port (3321), the second pressure limiting assembly (334) limits the return oil pressure of the hydraulic oil in the upper oil cavity (311).

9. A cab tipper system according to claim 8, characterised in that: The first pressure limiting assembly (333) comprises 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) provides elastic force for the first blocking ball (3331) to move to the side of blocking the first valve port (3311), the first elastic member B (3333) provides elastic force for the first blocking ball (3331) to move to the side of opening the first valve port (3311), when the return oil pressure of the hydraulic oil in the lower oil cavity (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. A cab roll-over system according to claim 8, characterised in that: The second pressure limiting assembly (334) comprises 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) provides elastic force for the second blocking ball (3341) to move to the side of blocking the second valve port (3321), the second elastic member B (3343) provides elastic force for the second blocking ball (3341) to move to the side of opening the second valve port (3321), when the return oil pressure of the hydraulic oil in the upper oil cavity (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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