CN218479980U - Hydraulic folding pedaling ladder of mining dump truck - Google Patents
Hydraulic folding pedaling ladder of mining dump truck Download PDFInfo
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- CN218479980U CN218479980U CN202222485162.1U CN202222485162U CN218479980U CN 218479980 U CN218479980 U CN 218479980U CN 202222485162 U CN202222485162 U CN 202222485162U CN 218479980 U CN218479980 U CN 218479980U
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Abstract
The utility model discloses a folding car ladder of pedaling of mining dump truck hydraulic pressure, include: the hydraulic control device comprises a connecting ladder, an end section ladder and a hydraulic control part, wherein the connecting ladder is hinged with the end section ladder, and two ends of a hydraulic oil cylinder of the hydraulic control part are respectively hinged with the connecting ladder and the end section ladder; the hydraulic control unit includes: the hydraulic oil tank, the hydraulic pump and the main oil inlets of the control valve are sequentially connected, and a main oil return port of the control valve is connected with the hydraulic oil tank through a hydraulic pipeline; a first working oil port of the control valve is connected with a first oil inlet of the balance valve, and a first oil outlet of the balance valve is connected with a lifting oil port of the hydraulic oil cylinder; and a second working oil port of the control valve is connected with a second oil inlet of the balance valve, and a second oil outlet of the balance valve is connected with a descending oil port of the hydraulic oil cylinder. The utility model discloses to pedal the ladder design into foldable and utilize hydraulic drive to rotate, the driver of being convenient for gets on or off the bus.
Description
Technical Field
The utility model belongs to electric drive mining dump truck field, concretely relates to mining dump truck hydraulic pressure is folding steps on car ladder.
Background
The mining dump truck belongs to an off-highway dump truck, has a large truck body height, is mainly used for transporting ores and mineral aggregates in a large-scale open mine, and is characterized in that a driver needs to install an additional boarding ladder when getting on or off a truck, wherein the boarding ladder is usually a straight ladder with a mechanical structure and is fixed at the left front part or the right front part of the truck, and the bottom end of the boarding ladder is lower than the ground surface in order to facilitate the boarding. Due to the fact that the mine road condition is poor, the tramcar stepping ladder is prone to colliding with large ores or obstacles on the road surface of the mine when the mine car runs, and deformation of the tramcar stepping ladder is caused. When the lowest end surface of the boarding ladder is higher than the ground, although the boarding ladder can be prevented from colliding with an obstacle, the boarding of personnel is inconvenient.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a mining dump truck hydraulic pressure is folding steps on car ladder designs into foldable and utilizes hydraulic drive to rotate, and under hydraulic cylinder drive, folding steps on car ladder can rotate around the round pin axle, and when the mine car is static, folding steps on the tail section of car ladder and falls down, the driver of being convenient for gets on or off the bus.
The technical scheme is as follows:
mining dump truck hydraulic pressure is folding steps of pedaling a car, includes: the hydraulic control device comprises a connecting ladder, a tail section ladder and a hydraulic control component, wherein the lower part of the connecting ladder is hinged with the upper part of the tail section ladder by a pin shaft, and two ends of a hydraulic oil cylinder of the hydraulic control component are respectively hinged with the connecting ladder and the tail section ladder; the hydraulic control unit includes: the hydraulic control system comprises a hydraulic oil tank, a hydraulic pump, a control valve, a balance valve and a hydraulic oil cylinder, wherein the hydraulic oil tank is connected with an input port of the hydraulic pump through a hydraulic pipeline, an output port of the hydraulic pump is connected with a main oil inlet of the control valve through a hydraulic pipeline, and a main oil return port of the control valve is connected with the hydraulic oil tank through a hydraulic pipeline; a first working oil port of the control valve is connected with a first oil inlet of the balance valve through a hydraulic pipeline, and a first oil outlet of the balance valve is connected with a lifting oil port of the hydraulic oil cylinder through a hydraulic pipeline; a second working oil port of the control valve is connected with a second oil inlet of the balance valve through a hydraulic pipeline, and a second oil outlet of the balance valve is connected with a descending oil port of the hydraulic oil cylinder through a hydraulic pipeline.
Further, the hydraulic cylinder includes: cylinder body, telescopic link, the rear portion of telescopic link is located the cylinder body, and the cylinder body articulates in the bottom of connecting the ladder, and the front end of telescopic link articulates in the lower part of end section ladder.
Furthermore, connecting ladder side plates are respectively arranged at two sides of the lower part of the connecting ladder, and connecting ladder shaft holes are formed in the connecting ladder side plates; the two sides of the lower part of the tail ladder are respectively provided with tail ladder side plates, and the tail ladder side plates are provided with tail ladder shaft holes; the connecting ladder shaft holes at two sides and the tail section ladder shaft hole are opposite in position, and two pin shafts are respectively arranged in the two pairs of connecting ladder shaft holes and the tail section ladder shaft hole; the outside in connecting the terraced shaft hole is provided with round pin axle screw hole, and the tip of round pin axle is provided with round pin axle through-hole, and round pin axle set screw passes round pin axle through-hole and connects in round pin axle screw hole, fixes the round pin axle.
Further, the control valve includes: the input port of the pressure reducing valve is connected with the main oil inlet through a hydraulic pipeline, and the output port of the pressure reducing valve is connected with the input port of the speed regulating valve through a hydraulic pipeline; the output port of the speed regulating valve is connected with the input port of the electromagnetic directional valve through a hydraulic pipeline; an oil return port of the electromagnetic reversing valve is connected with the main oil return port through a hydraulic pipeline, a first output port of the electromagnetic reversing valve is connected with a first working oil port through a hydraulic pipeline, and a second output port of the electromagnetic reversing valve is connected with a second working oil port through a hydraulic pipeline.
Furthermore, a filter screen is arranged on a hydraulic pipeline between the main oil inlet and the input port of the pressure reducing valve, and a filter is arranged on a hydraulic pipeline between the hydraulic pump and the control valve; and a second output port and an oil return port of the electromagnetic reversing valve are connected through a hydraulic pipeline, and the hydraulic pipeline is provided with a safety valve.
Furthermore, the control valve is provided with an emergency oil return port, the emergency oil return port is connected with a second output port through a hydraulic pipeline, a lifting oil port and a descending oil port of the hydraulic oil cylinder are respectively connected with an input port of the manual ball valve through hydraulic pipelines, and an output port of the manual ball valve is connected with the emergency oil return port through a hydraulic pipeline.
Further, the balancing valve includes: the first oil inlet is connected with the oil inlet of the first balance valve monomer through a hydraulic pipeline, and the oil outlet of the first balance valve monomer is connected with the first oil outlet through a hydraulic pipeline; the second oil inlet is connected with the oil inlet of the second balance valve monomer through a hydraulic pipeline, and the oil outlet of the second balance valve monomer is connected with the second oil outlet through a hydraulic pipeline; the oil inlet and the oil outlet of the first balance valve monomer are connected with a first one-way valve through a hydraulic pipeline, and the oil inlet of the first balance valve monomer is connected with the oil return port of the second balance valve monomer through a hydraulic pipeline; the oil inlet and the oil outlet of the second balance valve monomer are connected with a second one-way valve through a hydraulic pipeline, and the oil inlet of the second balance valve monomer is connected with the oil return port of the first balance valve monomer through a hydraulic pipeline.
The utility model discloses technical effect includes:
the utility model discloses to step on the car ladder design foldable and utilize hydraulic drive to rotate, under hydraulic cylinder drive, the folding car ladder of stepping on can rotate around the round pin axle, and when the mine car was static, the folding car ladder end section of stepping on fell down, and the driver of being convenient for gets on or off the bus. When the mine car is started, the tail end of the folding pedaling ladder is lifted, and the mine dumper is prevented from colliding with obstacles on the road surface of the mine to deform in the advancing process.
1. The utility model discloses a folding and the direction of rotation of folding car ladder end of pedaling is controlled to hydraulic means, realizes steady folding lift, has broken away from the restraint of ground clearance, and the personnel of being convenient for pass in and out the driver's cabin.
2. When the power source breaks down, the tail section of the folding bicycle-pedaling ladder descends by means of dead weight, self rescue is achieved without the help of external tools, and safety of a driver is improved.
3. The utility model provides a control valve adopts integral integrated valves, has reduced tube coupling and leakage point when satisfying the function.
Drawings
Fig. 1 is a schematic structural view of the hydraulic folding step of the mining dump truck of the utility model;
fig. 2 is a schematic structural diagram of the middle hydraulic control unit of the present invention.
Detailed Description
The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.
As shown in fig. 1, the structure of the hydraulic folding step of the mining dump truck of the present invention is schematically illustrated.
Mining dump truck hydraulic pressure is folding steps on car ladder, and the structure includes: the connecting ladder 1, the tail section ladder 2 and the hydraulic control component 3; the lower part of the connecting ladder 1 is hinged with the upper part of the tail section ladder 2 by a pin shaft 11, and two ends of a hydraulic oil cylinder 36 of the hydraulic control component 3 are respectively hinged with the connecting ladder 1 and the tail section ladder 2.
The cylinder body of the hydraulic oil cylinder 36 is hinged at the bottom of the connecting ladder 1, and the front end of the telescopic rod of the hydraulic oil cylinder 36 is hinged at the lower part of the tail section ladder 2.
The two sides of the lower part of the connecting ladder 1 are provided with connecting ladder side plates, and the connecting ladder side plates are provided with connecting ladder shaft holes; the two sides of the tail ladder 2 are provided with tail ladder side plates, and tail ladder shaft holes are formed in the tail ladder side plates; the connecting shaft holes at the two sides and the tail section shaft holes are opposite in position, and the two pin shafts 11 are respectively installed in the two pairs of connecting shaft holes and the tail section shaft holes. The outside of connecting the terraced shaft hole is provided with round pin axle screw hole, and the tip of round pin axle 11 is provided with round pin axle through-hole, and round pin axle set screw 12 passes round pin axle through-hole and connects in round pin axle screw hole, fixes round pin axle 3.
The two sides of the connecting ladder 1 are provided with connecting ladder guardrails 13, and the two sides of the tail section ladder 2 are provided with tail section ladder guardrails 21, so that personnel can conveniently climb the ladder.
As shown in fig. 2, it is a schematic structural diagram of the hydraulic control unit 3 according to the present invention.
The hydraulic control unit 3 includes: a hydraulic oil tank 31, a hydraulic pump 32, a control valve 34, a balance valve 35 and a hydraulic oil cylinder 36.
The hydraulic cylinder 36 includes: cylinder body, telescopic link, the rear portion of telescopic link is located the cylinder body. The hydraulic pump 32 is a constant pressure variable plunger pump, and the hydraulic pump 32 is driven by an engine or a generator as a power source and is used for converting mechanical energy into pressure energy of liquid to provide power for the whole device.
The hydraulic oil tank 31 is connected with an input port of the hydraulic pump 32 through a hydraulic pipeline, an output port of the hydraulic pump 32 is connected with a main oil inlet P of the control valve 34 through a hydraulic pipeline, and a main oil return port T of the control valve 34 is connected with the hydraulic oil tank 31 through a hydraulic pipeline; a first working oil port A of the control valve 34 is connected with a first oil inlet P1 of the balance valve 35 through a hydraulic pipeline, and a first oil outlet B1 of the balance valve 35 is connected with a lifting oil port B2 of the hydraulic oil cylinder 36 through a hydraulic pipeline; a second working oil port B of the control valve 34 is connected to a second oil inlet P2 of the balance valve 35 through a hydraulic pipeline, and a second oil outlet A1 of the balance valve 35 is connected to a descending oil port A2 of the hydraulic oil cylinder 36 through a hydraulic pipeline.
The control valve 34 includes: the pressure reducing valve 342, the speed regulating valve 343 and the electromagnetic reversing valve 344, wherein the input port of the pressure reducing valve 342 is connected with a main oil inlet P through a hydraulic pipeline, and the output port of the pressure reducing valve 342 is connected with the input port of the speed regulating valve 343 through a hydraulic pipeline; an output port of the speed regulating valve 343 is connected with an input port p of the electromagnetic directional valve 344 through a hydraulic pipeline; an oil return port T of the electromagnetic directional valve 344 is connected with the main oil return port T through a hydraulic pipeline, a first output port a is connected with a first working oil port a through a hydraulic pipeline, and a second output port B is connected with a second working oil port B through a hydraulic pipeline.
The electromagnetic directional valve 344 is a directional control valve, the neutral position is not powered in a normal state, and the direction change is realized by powering on and powering off the electromagnet, so that the lifting, descending and maintaining of the tail-end ladder 2 are controlled; the electromagnetic directional valve 344 is a three-position four-way directional valve, and when the input port p and the first output port a are communicated, the oil return port t and the second output port b are communicated; when the input port p and the second output port b are conducted, the oil return port t and the first output port a are conducted. The pressure reducing valve 342 is a pressure control valve that reduces the pressure from the hydraulic pump 32, and can adjust the pressure level according to the load. The speed regulating valve 343 is a flow control valve, and can regulate the lifting speed of the end ladder 2 according to requirements.
The utility model discloses in the preferred embodiment, in order to prevent that impurity from getting into control valve 34 in the hydraulic oil, the hydraulic pressure pipeline between the input port of input port P, relief pressure valve 342 is provided with filter screen 341, and filter screen 341 is filter element, guarantees the high cleanliness of hydraulic oil, avoids arousing the trouble because of impurity in the hydraulic oil. In order to prevent the oil return pressure inside the electromagnetic directional valve 344 from being too high, the second output port b and the oil return port t are connected by a hydraulic pipeline and provided with a safety valve 345; the safety valve 345 is a pressure control valve that functions to regulate the input pressure at the descent of the end ladder 2, and may be adjusted as desired. The filter screen 341, the pressure reducing valve 342, the speed regulating valve 343, the electromagnetic directional valve 344 and the safety valve 345 arranged inside the control valve 34 are all screw-type cartridge valves and are integrated into an integrated valve block.
The balance valve 35 is a pressure control valve, which can perform bidirectional pressure control to ensure the stable action of the hydraulic oil cylinder 36. The balance valve 35 includes: the first balance valve single body 351 and the second balance valve single body 352 are connected, a first oil inlet P1 is connected with an oil inlet of the first balance valve single body 351 through a hydraulic pipeline, and an oil outlet of the first balance valve single body 351 is connected with a first oil outlet B1 through a hydraulic pipeline; the second oil inlet is connected with the oil inlet of the second balance valve unit 352 through a hydraulic pipeline, and the oil outlet of the second balance valve unit 352 is connected with the second oil outlet A1 through a hydraulic pipeline.
An oil inlet and an oil outlet of the first balance valve single body 351 are connected with a first one-way valve through a hydraulic pipeline, and an oil inlet of the first balance valve single body 351 is connected with an oil return port of the second balance valve single body 352 through a hydraulic pipeline; an oil inlet and an oil outlet of the second balance valve unit 352 are connected with a second one-way valve through a hydraulic pipeline, and an oil inlet of the second balance valve unit 352 is connected with an oil return port of the first balance valve unit 351 through a hydraulic pipeline. The first check valve and the second check valve are used for preventing the internal pressure from being overlarge under the condition of keeping the oil pressure.
The hydraulic oil cylinder 36 is an actuating element and can output power to drive the tail ladder 2 to move. The hydraulic cylinder 36 is provided with a lifting oil port B2 and a lowering oil port A2. Oil is injected from the lifting oil port B2, the telescopic rod of the hydraulic oil cylinder 36 extends out, and the telescopic rod drives the tail section ladder 2 to lift; the oil is injected from the descending oil port A2, the telescopic rod of the hydraulic oil cylinder 36 retracts, and the telescopic rod drives the tail ladder 2 to descend.
In order to put down the tail ladder 2 after the hydraulic pump 32 loses the hydraulic pressure, the control valve 34 is provided with an emergency oil return port T1, the emergency oil return port T1 is connected with a second output port B through a hydraulic pipeline, a descending oil port A2 and a lifting oil port B2 of the hydraulic oil cylinder 6 are respectively connected with an input port of a manual ball valve 37 through hydraulic pipelines, and an output port of the manual ball valve 37 is connected with the emergency oil return port T1 through a hydraulic pipeline. The manual ball valve 37 is a two-position, two-way directional valve, normally in the off position.
In the preferred embodiment of the present invention, in order to prevent the impurities in the hydraulic oil tank 31 from entering the hydraulic line, the hydraulic line between the hydraulic pump 32 and the control valve 34 is provided with a filter 33. The filter 33 filters the high-pressure oil at the outlet of the hydraulic pump 32 to ensure the cleanliness of the oil entering the control valve 34.
In the preferred embodiment of the present invention, the control valve 34 is provided with a plurality of pressure detecting ports (M1, M2, M3, MA, MB), the pressure detecting ports are provided with plugs, and the plugs are removed when detecting pressure, or a pressure sensor is provided in the pressure detecting ports to replace the plugs; the pressure detection port M1 is connected to a hydraulic line between the pressure reducing valve 342 and the filter screen 341 through a detection line; the pressure detection port M2 is connected to a hydraulic pipeline between the pressure reducing valve 342 and the speed regulating valve 343 through a detection pipeline; the pressure detection port M3 is connected with a hydraulic pipeline between the speed regulating valve 343 and the electromagnetic directional valve 344 through a detection pipeline; the pressure detection port MA is connected with the first working oil port A through a detection pipeline, and the pressure detection port MB is connected with the second working oil port B through a detection pipeline.
The use method of the hydraulic folding step ladder for the mining dump truck comprises the following steps:
step 1: after the vehicle is started, the engine drives the hydraulic pump 32 to rotate to build pressure oil, the pressure oil reaches a main oil inlet of the control valve 34, the electromagnetic directional valve 344 is not powered, and the tail-end ladder 2 is in a holding position;
when the vehicle is in a starting state, the engine drives the hydraulic pump 32 to operate and output pressure oil, the pressure oil enters the main oil inlet of the control valve 34 through the filter 33, is secondarily filtered by the filter screen 341 in the control valve 34, is reduced in pressure by the pressure reducing valve 342, and reaches the input port p of the electromagnetic directional valve 344 after the flow is regulated by the speed regulating valve 343. After the pressure oil passes through the filter 33 and the filter screen 341, high-cleanliness hydraulic oil is provided for the control device; the hydraulic oil is regulated by a pressure reducing valve 342 to provide a suitable pressure and regulated by a speed regulating valve 343 to provide a suitable flow.
After the vehicle is started, the electromagnetic directional valve 344 is in the neutral position because it is not powered, the pressure oil is cut off at this position, no hydraulic oil enters the hydraulic oil cylinder 36, and the end ladder 2 is in the holding position. When the vehicle is in a flameout state, the engine stops working at the moment, the hydraulic pipeline has no oil pressure power, and the hydraulic oil cylinder 36 does not act.
Step 2: when the end ladder 2 needs to descend, the descending electromagnet of the electromagnetic directional valve 344 is electrified, the input port p and the second output port b are communicated, and the oil return port t and the first output port a are communicated; the pressure oil reaches a second oil inlet P2 of the balance valve 35 through the input port P, the second output port b and the first working oil port A, the pressure oil enters an oil inlet of the second balance valve single body 352, reaches a second oil outlet A1 from an oil outlet of the second balance valve single body 352, the pressure oil enters a descending oil port A2 of the hydraulic oil cylinder 36, and a telescopic rod of the hydraulic oil cylinder 36 extends out to push the tail section to descend in a ladder way;
when the vehicle is in a starting state, the descending electromagnet of the electromagnetic directional valve 344 is electrified, and pressure oil flows out from the second output port B of the electromagnetic directional valve 344, and reaches the second working oil port B after the pressure is controlled by the safety valve 345.
When the telescopic rod of the hydraulic oil cylinder 36 retracts to the right, the pressure oil does not enter the descending oil port A2 any more, and the pressure oil enters the oil return port of the first balance valve monomer 351 from the oil inlet of the second balance valve monomer 352 and reaches the oil inlet; the pressure oil discharged from the lifting oil port B2 reversely enters the oil inlet from the oil outlet of the first balance valve monomer 351; the pressure oil enters the hydraulic oil tank 31 through the oil inlet of the first balanced valve unit 351, the first oil inlet P1, the first working oil port a, the first output port a, the oil return port T and the main oil return port T.
The unable normal during operation of hydraulic pump 32 that breaks down of vehicle, end section ladder 2 is in lifting the hold state, manual ball valve 37 of operation switches on, make hydraulic cylinder 36 decline hydraulic fluid port A2, lift hydraulic fluid port B2 and hydraulic tank 31 intercommunication, hydraulic cylinder 36 decline hydraulic fluid port A2, the pressure oil that lifts hydraulic fluid port B2 is through manual ball valve 37, urgent oil return opening T1, second delivery outlet B, oil return opening T, main oil return opening T gets into hydraulic tank 31, end section ladder 2 can rely on the dead weight to descend after hydraulic cylinder 36 releases the pressure, make the driver get off smoothly.
And step 3: when the tail-end ladder 2 needs to be lifted, the lifting electromagnet of the electromagnetic directional valve 344 is electrified, the input port p and the first output port a of the electromagnetic directional valve 344 are communicated, and the oil return port t and the second output port b are communicated; pressure oil reaches a first oil inlet P1 of the balance valve 35 through an input port P, a first output port a and a first working oil port A, the pressure oil enters an oil inlet of the first balance valve monomer 351, reaches a first oil outlet B1 from an oil outlet of the first balance valve monomer 351, the pressure oil enters a lifting oil port B2 of the hydraulic oil cylinder 36, and a telescopic rod of the hydraulic oil cylinder 36 extends out to drive the tail-section ladder 2 to lift;
when the telescopic rod of the hydraulic oil cylinder 36 extends to the right position, the pressure oil does not enter the lifting oil port B2 any more, and the pressure oil enters the oil return port of the second balance valve unit 352 from the oil inlet of the first balance valve unit 351 and reaches the oil inlet; the pressure oil discharged from the descending oil port A2 reversely enters the oil inlet from the oil outlet of the second balanced valve single body 352; the pressure oil enters the hydraulic oil tank 31 through the oil inlet, the second working oil port B, the second output port B, the oil return port T, and the main oil return port T of the second balanced valve unit 352.
The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.
Claims (7)
1. The utility model provides a mining dump truck hydraulic pressure folding step, its characterized in that includes: the hydraulic control device comprises a connecting ladder, a tail section ladder and a hydraulic control component, wherein the lower part of the connecting ladder is hinged with the upper part of the tail section ladder by a pin shaft, and two ends of a hydraulic oil cylinder of the hydraulic control component are respectively hinged with the connecting ladder and the tail section ladder; the hydraulic control unit includes: the hydraulic control system comprises a hydraulic oil tank, a hydraulic pump, a control valve, a balance valve and a hydraulic oil cylinder, wherein the hydraulic oil tank is connected with an input port of the hydraulic pump through a hydraulic pipeline, an output port of the hydraulic pump is connected with a main oil inlet of the control valve through a hydraulic pipeline, and a main oil return port of the control valve is connected with the hydraulic oil tank through a hydraulic pipeline; a first working oil port of the control valve is connected with a first oil inlet of the balance valve through a hydraulic pipeline, and a first oil outlet of the balance valve is connected with a lifting oil port of the hydraulic oil cylinder through a hydraulic pipeline; and a second working oil port of the control valve is connected with a second oil inlet of the balance valve through a hydraulic pipeline, and a second oil outlet of the balance valve is connected with a descending oil port of the hydraulic oil cylinder through a hydraulic pipeline.
2. The mining dump truck hydraulic folding boarding ladder of claim 1, characterized in that a hydraulic cylinder comprises: cylinder body, telescopic link, the rear portion of telescopic link is located the cylinder body, and the cylinder body articulates in the bottom of connecting the ladder, and the front end of telescopic link articulates in the lower part of end section ladder.
3. The mining dump truck hydraulic folding boarding ladder as claimed in claim 1, characterized in that the connecting ladder is provided with connecting ladder side plates on both sides of the lower part, the connecting ladder side plates are provided with connecting ladder shaft holes; the two sides of the lower part of the tail ladder are respectively provided with tail ladder side plates, and tail ladder shaft holes are formed in the tail ladder side plates; the connecting ladder shaft holes and the tail section ladder shaft holes on the two sides are opposite in position, and two pin shafts are respectively arranged in the two pairs of connecting ladder shaft holes and the tail section ladder shaft holes; the outside in connecting the terraced shaft hole is provided with round pin axle screw hole, and the tip of round pin axle is provided with round pin axle through-hole, and round pin axle set screw passes round pin axle through-hole and connects in round pin axle screw hole, fixes the round pin axle.
4. The mining dump truck hydraulic folding boarding ladder of claim 1, characterized in that the control valve comprises: the input port of the pressure reducing valve is connected with the main oil inlet through a hydraulic pipeline, and the output port of the pressure reducing valve is connected with the input port of the speed regulating valve through a hydraulic pipeline; the output port of the speed regulating valve is connected with the input port of the electromagnetic directional valve through a hydraulic pipeline; the oil return port of the electromagnetic directional valve is connected with the main oil return port through a hydraulic pipeline, the first output port of the electromagnetic directional valve is connected with the first working oil port through a hydraulic pipeline, and the second output port of the electromagnetic directional valve is connected with the second working oil port through a hydraulic pipeline.
5. The mining dump truck hydraulic folding step ladder as claimed in claim 4, characterized in that a filter screen is arranged on a hydraulic pipeline between the main oil inlet and the input port of the pressure reducing valve, and a filter is arranged on a hydraulic pipeline between the hydraulic pump and the control valve; and a second output port and an oil return port of the electromagnetic reversing valve are connected through a hydraulic pipeline, and the hydraulic pipeline is provided with a safety valve.
6. The mining dump truck hydraulic folding pedaling ladder as recited in claim 4, wherein the control valve is provided with an emergency oil return port, the emergency oil return port is connected with the second output port through a hydraulic pipeline, the lifting oil port and the descending oil port of the hydraulic oil cylinder are respectively connected with the input port of the manual ball valve through hydraulic pipelines, and the output port of the manual ball valve is connected with the emergency oil return port through a hydraulic pipeline.
7. The mining dump truck hydraulic folding boarding ladder of claim 1, characterized in that the balancing valve comprises: the first oil inlet is connected with the oil inlet of the first balance valve monomer through a hydraulic pipeline, and the oil outlet of the first balance valve monomer is connected with the first oil outlet through a hydraulic pipeline; the second oil inlet is connected with the oil inlet of the second balance valve monomer through a hydraulic pipeline, and the oil outlet of the second balance valve monomer is connected with the second oil outlet through a hydraulic pipeline; the oil inlet and the oil outlet of the first balance valve monomer are connected with a first one-way valve through a hydraulic pipeline, and the oil inlet of the first balance valve monomer is connected with the oil return port of the second balance valve monomer through a hydraulic pipeline; the oil inlet and the oil outlet of the second balance valve monomer are connected with a second one-way valve through a hydraulic pipeline, and the oil inlet of the second balance valve monomer is connected with the oil return port of the first balance valve monomer through a hydraulic pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222485162.1U CN218479980U (en) | 2022-09-19 | 2022-09-19 | Hydraulic folding pedaling ladder of mining dump truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222485162.1U CN218479980U (en) | 2022-09-19 | 2022-09-19 | Hydraulic folding pedaling ladder of mining dump truck |
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| Publication Number | Publication Date |
|---|---|
| CN218479980U true CN218479980U (en) | 2023-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222485162.1U Active CN218479980U (en) | 2022-09-19 | 2022-09-19 | Hydraulic folding pedaling ladder of mining dump truck |
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| Country | Link |
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| CN (1) | CN218479980U (en) |
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- 2022-09-19 CN CN202222485162.1U patent/CN218479980U/en active Active
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