Liftable cab and construction machinery

Abstract

The present invention provides a liftable cab and engineering machinery, and relates to the technical field of engineering machinery cabs. The liftable cab comprises a cab, a hydraulic drive mechanism and a reset mechanism. The hydraulic drive mechanism can be used to drive the cab to reciprocate up and down, and the hydraulic drive mechanism is provided with a control mechanism, and the control mechanism is used to control the flow direction of the hydraulic oil of the hydraulic drive mechanism. The hydraulic drive mechanism adds a reset oil circuit, and the reset mechanism on the reset oil circuit is arranged in parallel with the control mechanism. When the control mechanism operates normally, the reset mechanism is in a closed state. When the control mechanism fails and the cab cannot be lowered, the reset mechanism is opened, and the reset mechanism can control the outflow of the hydraulic oil in the hydraulic drive mechanism, so that the pressure relief regulating cab in the hydraulic drive mechanism can fall back to the original position, thereby alleviating the technical problem that the liftable cab in the prior art cannot be lowered in an emergency, and there is a safety hazard to the driver.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery cabs, and in particular to a liftable cab and engineering machinery. Background Art

[0002] At present, as the working conditions of construction machinery become more and more complicated, the height difference of the working environment is relatively large. During the operation of the traditional fixed cab, the driver's vision is easily blocked due to the small field of view, which makes the driver's operation inconvenient.

[0003] In the prior art, a cab that can be raised or lowered is equipped with multiple hydraulic cylinders at the bottom of the cab, and the cab is raised or lowered by driving the hydraulic cylinders. However, when the hydraulic cylinders of the cab that can be raised or lowered in the prior art have abnormalities, such as the engine is turned off and cannot be started or the pump cannot work, the control mechanism cannot switch the working state, which will cause the cab to be unable to descend, posing a safety hazard. Summary of the invention

[0004] The purpose of the present invention is to provide a lifting device and a liftable cab to alleviate the technical problem in the prior art that the liftable cab cannot be lowered in an emergency, posing a potential safety hazard to the driver.

[0005] The present invention provides a liftable cab, comprising: a cab, a hydraulic drive mechanism and a reset mechanism;

[0006] The hydraulic drive mechanism is used to drive the cab to reciprocate up and down. A control mechanism is provided on the oil inlet line of the hydraulic drive mechanism. The control mechanism is used to control the flow direction of the hydraulic oil of the hydraulic drive mechanism. When the hydraulic oil flows into the hydraulic drive mechanism, the hydraulic drive mechanism is pressurized and the cab is lifted. When the hydraulic oil of the hydraulic drive mechanism flows out, the hydraulic drive mechanism is depressurized and the cab falls back.

[0007] The reset mechanism is located on the reset oil circuit, the reset oil circuit is connected to the hydraulic drive mechanism, the reset mechanism is arranged in parallel with the control mechanism, and the reset mechanism can be used to control the outflow of hydraulic oil in the hydraulic drive mechanism to release pressure in the hydraulic drive mechanism, so as to adjust the cab to fall back to its original position.

[0008] In a preferred embodiment of the present invention, it also includes a lifting bracket and a fixed platform;

[0009] The lifting bracket is connected to the bottom of the cab, the hydraulic drive mechanism is hinged to the lifting bracket, the hydraulic drive mechanism is used to drive the lifting bracket to reciprocate up and down, the fixed platform is connected to a side of the lifting bracket away from the cab, and the fixed end of the hydraulic drive mechanism is connected to the fixed platform.

[0010] In a preferred embodiment of the present invention, the hydraulic drive mechanism includes a hydraulic cylinder and a cylinder support;

[0011] The cylinder support is fixedly connected to the fixed platform, the hydraulic cylinder is hinged to the cylinder support, the extended end of the hydraulic cylinder is hinged to the lifting bracket, and the hydraulic cylinder is inclined from one end connected to the cylinder support to the other end.

[0012] In a preferred embodiment of the present invention, the control mechanism includes an oil tank, a hydraulic lock, a lifting and reversing valve and a pump;

[0013] The oil tank is connected to the hydraulic cylinder through the pump, the lifting reversing valve and the hydraulic lock in sequence, and the lifting reversing valve is used to control the flow direction of the hydraulic oil between the oil tank and the hydraulic cylinder to adjust the extension or retraction of the hydraulic cylinder;

[0014] Both ends of the reset oil circuit are communicated with the oil tank and the hydraulic cylinder respectively.

[0015] In a preferred embodiment of the present invention, the control mechanism further comprises a one-way throttle valve;

[0016] The one-way throttle valve is located between the lifting reversing valve and the hydraulic lock and is communicated with the lifting reversing valve. The one-way throttle valve is used to adjust the flow of the hydraulic oil in the oil circuit to adjust the speed of the cab lifting.

[0017] In a preferred embodiment of the present invention, the lifting bracket comprises a parallelepiped and a fixing rod which are hinged to each other at a connection point;

[0018] The two opposite planes of the parallelepiped are respectively connected to the cab and the fixed platform, the fixed rod is connected to the two rods on any remaining side surfaces of the parallelepiped, the driving end of the hydraulic drive mechanism is hinged to the fixed rod, and the hydraulic drive mechanism is used to drive the hinge position of the parallelepiped to rotate, so as to drive the cab to reciprocate up and down.

[0019] In a preferred embodiment of the present invention, the parallelepiped includes a first fixing portion, a second fixing portion and a connecting rod;

[0020] The first fixing portion is connected to the bottom of the cab, the second fixing portion is connected to the platform, four connecting rods are provided, and two ends of any one of the connecting rods are respectively hinged to the first fixing portion and the second fixing portion, so that the parallelepiped is formed by the first fixing portion, the second fixing portion and the four connecting rods;

[0021] The fixing rod is connected to any two of the connecting rods.

[0022] In a preferred embodiment of the present invention, the connecting rod includes a first connecting portion and a second connecting portion;

[0023] The first connection portion and the second connection portion are integrally formed, and the first connection portion and the second connection portion are arranged at an angle;

[0024] The connecting rod on one side of the parallelepiped close to the hydraulic drive mechanism is hinged to the first fixing part through the first connecting part, and the second connecting part is hinged to the second fixing part;

[0025] The connecting rod at a side of the parallelepiped away from the hydraulic drive mechanism is hinged to the first fixing part through the second connecting part, and the first connecting part is hinged to the second fixing part.

[0026] In a preferred embodiment of the present invention, the hinges at any connection points of the parallelepiped are connected by pins.

[0027] The invention provides an engineering machine, comprising the liftable cab.

[0028] The invention provides a liftable cab, comprising: a cab, a hydraulic drive mechanism and a reset mechanism; the hydraulic drive mechanism can be used to drive the cab to reciprocate up and down, and a control mechanism is arranged on the oil inlet circuit of the hydraulic drive mechanism, the control mechanism is used to control the flow direction of the hydraulic oil of the hydraulic drive mechanism, and when the hydraulic oil flows into the hydraulic drive mechanism, the hydraulic drive mechanism is pressurized and the cab is lifted, and when the hydraulic oil of the hydraulic drive mechanism flows out, the hydraulic drive mechanism is depressurized and the cab falls back; further, a reset oil circuit is added on the basis of the oil inlet circuit by the hydraulic drive mechanism, and the reset mechanism on the reset oil circuit is arranged in parallel with the control mechanism, when the control mechanism operates normally, the reset mechanism is in a closed state, when the control mechanism fails and the cab cannot be lowered, the reset mechanism can be opened, and the reset mechanism can control the outflow of the hydraulic oil in the hydraulic drive mechanism, so that the pressure in the hydraulic drive mechanism is released to adjust the cab to fall back to the original position, thereby alleviating the technical problem that the liftable cab cannot be lowered in an emergency in the prior art, which poses a safety hazard to the driver. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0030] Figure 1 A schematic structural diagram of a liftable cab provided by an embodiment of the present invention in an original position;

[0031] Figure 2 A schematic diagram of the structure of a liftable cab after it is lifted up provided by an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the structure of a lifting bracket of a liftable cab provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the working principle of the hydraulic drive mechanism of the liftable cab provided in an embodiment of the present invention.

[0034] Icons: 100-cab; 200-hydraulic drive mechanism; 201-hydraulic cylinder; 202-cylinder support; 300-control mechanism; 301-oil inlet circuit; 302-oil tank; 303-hydraulic lock; 304-lifting reversing valve; 305-pump; 306-one-way throttle valve; 400-reset mechanism; 401-reset oil circuit; 500-lifting bracket; 501-fixing rod; 502-first fixing part; 503-second fixing part; 504-first connecting part; 505-second connecting part; 506-pin shaft; 600-fixed platform. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1-Figure 4As shown, the present embodiment provides a liftable cab, comprising: a cab 100, a hydraulic drive mechanism 200 and a reset mechanism 400; the hydraulic drive mechanism 200 is used to drive the cab 100 to reciprocate up and down, and a control mechanism 300 is arranged on the oil inlet circuit 301 of the hydraulic drive mechanism 200, the control mechanism 300 is used to control the flow direction of the hydraulic oil of the hydraulic drive mechanism 200, and when the hydraulic oil flows into the hydraulic drive mechanism 200, the hydraulic drive mechanism 200 is pressurized and the cab 100 is lifted, and when the hydraulic oil of the hydraulic drive mechanism 200 flows out, the hydraulic drive mechanism 200 is depressurized and the cab 100 falls back; the reset mechanism 400 is located on the reset oil circuit 401, the reset oil circuit 401 is connected to the hydraulic drive mechanism 200, the reset mechanism 400 is arranged in parallel with the control mechanism 300, and the reset mechanism 400 can be used for control.

[0037] It should be noted that the cab 100 serves as the operating space of the engineering machinery. As the working conditions of the engineering machinery become more and more complicated, in view of the large height difference in the working environment, the traditional fixed cab 100 has a small field of view during operation, and the driver's line of sight is easily obstructed, resulting in inconvenience for the driver to operate. The present embodiment provides a liftable cab 100, which can adjust the driver's field of view under different working conditions and improve overall work efficiency.

[0038] In order to facilitate the lifting and lowering process of the cab 100, the cab 100 utilizes the reciprocating motion of the hydraulic drive mechanism 200 to drive the cab 100 to reciprocate up and down, wherein a control mechanism 300 is provided on the oil inlet circuit 301 of the hydraulic drive mechanism 200, and the switch position of the control mechanism 300 is located inside the cab 100. Therefore, the driver in the cab 100 can control the opening and closing of the hydraulic drive mechanism 200 through the control mechanism 300 in real time, and thus can more flexibly adjust the lifting and lowering of the cab 100.

[0039] Optionally, a base is provided at the bottom of the cab 100, and the base and the cab 100 can be fixedly connected or integrally formed, and the hydraulic drive mechanism 200 is movably connected to the base of the cab 100, and the hydraulic drive mechanism 200 is telescopically controlled by using the control mechanism 300 to deliver the hydraulic oil inlet and outlet, and since the reset mechanism 400 is an emergency oil return control structure, the hydraulic drive mechanism 200 needs to ensure that when the oil is returned, the pressure in the hydraulic drive mechanism 200 is released and the cab 100 falls back; further, since when the hydraulic oil flows into the hydraulic drive mechanism 200, the pressure driving force of the pressurized hydraulic drive mechanism 200 will be greater than the driving force of the pressure relief when the hydraulic oil in the hydraulic drive mechanism 200 flows out, preferably, when the pressurized oil flows into the hydraulic drive mechanism 200, the hydraulic drive mechanism 200 is pressurized and the cab 100 is lifted, and when the hydraulic oil of the hydraulic drive mechanism 200 flows out, the pressure in the hydraulic drive mechanism 200 is released and the cab 100 falls back.

[0040] What needs to be ensured by the reset mechanism 400 is that when an emergency occurs during the lifting and lowering of the cab 100, the cab 100 cannot be lowered; at this time, the reset mechanism 400 can be opened to allow the hydraulic oil in the hydraulic drive mechanism 200 to flow out, so as to release the pressure in the hydraulic drive mechanism 200 and adjust the cab 100 to its original position; it should be noted that when the control mechanism 300 is running, the reset oil circuit 401 and the reset mechanism 400 are both in a closed state, and the oil inlet circuit 301 can control the entire movement of the hydraulic drive mechanism 200.

[0041] The embodiment provides a liftable cab, comprising: a cab 100, a hydraulic drive mechanism 200 and a reset mechanism 400; the hydraulic drive mechanism 200 can be used to drive the cab 100 to move up and down, and a control mechanism 300 is provided on the oil inlet 301 of the hydraulic drive mechanism 200, and the control mechanism 300 is used to control the flow direction of the hydraulic oil of the hydraulic drive mechanism 200, and when the hydraulic oil flows into the hydraulic drive mechanism 200, the hydraulic drive mechanism 200 is pressurized and the cab 100 is lifted, and when the hydraulic oil of the hydraulic drive mechanism 200 flows out, the hydraulic drive mechanism 200 is depressurized and the cab 100 falls back; further, the hydraulic drive mechanism 200 is used to control the flow direction of the hydraulic oil of the hydraulic drive mechanism 200 at the oil inlet 301 ... at the oil inlet 301, and the control mechanism 300 is used to control the flow direction of the hydraulic oil of the hydraulic drive mechanism 200 at the oil inlet 301, and the control mechanism 300 is used to control the flow direction of the hydraulic oil of the hydraulic drive mechanism 200 at the oil inlet 301, and the control mechanism 300 is used to control the flow direction A reset oil circuit 401 is added on the basis of the oil circuit 301, and the reset mechanism 400 on the reset oil circuit 401 is arranged in parallel with the control mechanism 300. When the control mechanism 300 operates normally, the reset mechanism 400 is in a closed state. When the control mechanism 300 fails and the cab 100 cannot be landed, the reset mechanism 400 can be opened. The reset mechanism 400 can control the outflow of hydraulic oil in the hydraulic drive mechanism 200 to make the pressure relief adjustment in the hydraulic drive mechanism 200 so that the cab 100 can fall back to the original position, thereby alleviating the technical problem in the prior art that the cab 100 that can be raised and lowered cannot be landed in an emergency, posing a safety hazard to the driver.

[0042] like Figure 1-Figure 3 As shown, on the basis of the above embodiments, in a preferred embodiment of the present invention, it also includes a lifting bracket 500 and a fixed platform 600; the lifting bracket 500 is connected to the bottom of the cab 100, the hydraulic drive mechanism 200 is hinged to the lifting bracket 500, the hydraulic drive mechanism 200 is used to drive the lifting bracket 500 to reciprocate up and down, the fixed platform 600 is connected to the side of the lifting bracket 500 away from the cab 100, and the fixed end of the hydraulic drive mechanism 200 is connected to the fixed platform 600.

[0043] Among them, the fixed platform 600 can be fixedly connected to the plane on the engineering machinery, or the fixed platform 600 is a horizontal plane platform on the engineering machinery; the lifting bracket 500 serves as a transmission lifting mechanism between the hydraulic drive mechanism 200 and the cab 100. When the hydraulic drive mechanism 200 is in operation, since the hydraulic drive mechanism 200 is hinged with the lifting bracket 500, the hydraulic drive mechanism 200 can transmit the upward or downward power to the cab 100 through the lifting bracket 500, and the lifting bracket can ensure the stability of the cab 100 during the lifting process.

[0044] Optionally, the lifting bracket 500 is fixedly connected to the fixed platform 600, wherein one plane of the lifting bracket 500 is fixed on the fixed plane, and the other side plane corresponding to the lifting bracket 500 is fixedly connected to the base of the cab 100. At this time, the surrounding side of the lifting bracket 500 has multiple hinged ends, and the lifting and lowering of the lifting bracket 500 can drive the lifting and lowering movement of the cab 100.

[0045] In a preferred embodiment of the present invention, the hydraulic drive mechanism 200 includes a hydraulic cylinder 201 and a cylinder support 202; the cylinder support 202 is fixedly connected to the fixed platform 600, the hydraulic cylinder 201 is hinged to the cylinder support 202, the protruding end of the hydraulic cylinder 201 is hinged to the lifting bracket 500, and the hydraulic cylinder 201 is inclined from one end connected to the cylinder support 202 to the other end.

[0046] Optionally, the hydraulic cylinder 201 and the cylinder support 202 can be hingedly connected by a pin shaft 506. Further, the connection method of the hydraulic cylinder 201 and the lifting bracket 500 can be adopted, wherein a hinge seat is provided on the primary surface of the lifting bracket 500, and the extended end of the hydraulic cylinder 201 is connected to the hinge seat through the pin shaft 506, and the end of the hydraulic cylinder 201 connected to the cylinder support 202 is inclined to the end connected to the lifting bracket 500. When the extended end of the hydraulic cylinder 201 extends outward, the hydraulic cylinder 201 It will move in an inclined manner. It should be noted that since the cylinder support 202 is located on the fixed platform 600, the articulated seat is located on the lifting bracket 500, and the lifting bracket 500 is located above the fixed platform 600, when the hydraulic cylinder 201 moves, it will drive the lifting bracket 500 to rise, and then drive the cab 100 to rise; similarly, when the hydraulic cylinder 201 retracts, the hydraulic cylinder 201 will drive the lifting bracket 500 to descend, and then drive the cab 100 to descend.

[0047] like Figure 4 As shown, in a preferred embodiment of the present invention, the control mechanism 300 includes an oil tank 302, a hydraulic lock 303, a lifting reversing valve 304 and a pump 305; the oil tank 302 is connected to the hydraulic cylinder 201 through the pump 305, the lifting reversing valve 304 and the hydraulic lock 303 in sequence, and the lifting reversing valve 304 is used to control the flow direction of the hydraulic oil between the oil tank 302 and the hydraulic cylinder 201 to adjust the extension or retraction of the hydraulic cylinder 201; the two ends of the reset oil circuit 401 are respectively connected to the oil tank 302 and the hydraulic cylinder 201.

[0048] Optionally, when the lifting reversing valve 304 is opened to the right, the hydraulic oil provided by the pump 305 enters the large chamber of the hydraulic cylinder 201, causing the piston rod of the hydraulic cylinder 201 to extend, thereby pushing the lifting bracket 500 to rise. When the cab 100 is lifted to any position and stops, the lifting reversing valve 304 returns to the middle position, and the hydraulic cylinder 201 remains locked under the action of the hydraulic lock 303, thereby ensuring the safety of the cab 100.

[0049] Among them, the hydraulic lock 303 can prevent the oil from flowing in the circuit by locking the circuit of the oil inlet circuit 301; the function of the hydraulic lock 303 is interlocking. When the lifting and reversing valve 304 is in the middle position, the left and right cylinders of the hydraulic cylinder 201 are in a stationary state under the action of the two one-way valves; when the lifting and reversing valve 304 is in the right position function, this is the oil inlet process of the oil inlet circuit 301. At this time, the right one-way valve is filled with oil, and at the same time, the oil circuit is controlled to open the left one-way valve to drain oil; the same applies when the lifting and reversing valve 304 is in the left position function.

[0050] Optionally, the reset mechanism 400 can adopt a reversing valve. In this case, the lifting reversing valve 304 in the control mechanism 300 adopts a Y-type reversing valve. Since the lifting reversing valve 304 is a Y-type reversing valve, when the lifting reversing valve 304 is in the middle position, one side of the oil inlet circuit 301 is connected to the oil tank 302. At this time, the reversing valve of the reset mechanism 400 is moved to the left, and the hydraulic oil returns to the oil tank 302 from the large chamber of the hydraulic cylinder 201 through the reset oil circuit 401 and the reversing valve, causing the cab 100 to descend.

[0051] In a preferred embodiment of the present invention, the control mechanism 300 further includes a one-way throttle valve 306; the one-way throttle valve 306 is located between the lifting reversing valve 304 and the hydraulic lock 303, and is connected to the lifting reversing valve 304. The one-way throttle valve 306 is used to adjust the flow of hydraulic oil in the oil circuit to adjust the lifting speed of the cab 100. In this embodiment, by adding a one-way throttle valve 306 to the large and small chamber oil circuits of the hydraulic cylinder 201, the lifting speed of the cab 100 can be adjusted according to the driver's needs. Among them, the one-way throttle valve 306 is a valve that controls the flow of fluid by changing the throttle section or throttle length; the throttle valve and the one-way valve can be combined into a one-way throttle valve 306 by connecting them in parallel.

[0052] In a preferred embodiment of the present invention, the lifting bracket 500 includes a parallelepiped and a fixed rod 501 which are hinged to each other at the connection point; two opposite planes of the parallelepiped are respectively connected to the cab 100 and the fixed platform 600, the fixed rod 501 is connected to the two rods on any remaining side of the parallelepiped, and the driving end of the hydraulic drive mechanism 200 is hinged to the fixed rod 501. The hydraulic drive mechanism 200 is used to drive the hinge position of the parallelepiped to rotate, so as to drive the cab 100 to reciprocate up and down.

[0053] Preferably, the parallelepiped adopts an oblique parallelepiped, and the fixed rod 501 is fixedly connected to one side of the parallelepiped. At this time, the piston of the hydraulic cylinder 201 is hinged to the fixed rod 501. Furthermore, the above-mentioned hinge seat is fixedly connected to the fixed rod 501, and the protruding end of the hydraulic cylinder 201 is hinged to the hinge seat through a pin 506. When the hydraulic cylinder 201 pushes the fixed rod 501, a driving force is applied to one side of the oblique parallelepiped, which will cause the various mutually hinged connection points of the parallelepiped to rotate, thereby driving the cab 100 to rise or fall.

[0054] like Figure 3 As shown, in a preferred embodiment of the present invention, the parallelepiped includes a first fixed portion 502, a second fixed portion 503 and a connecting rod; the first fixed portion 502 is connected to the bottom of the cab 100, the second fixed portion 503 is connected to the fixed platform 600, four connecting rods are provided, and the two ends of any one of the connecting rods are respectively hinged to the first fixed portion 502 and the second fixed portion 503 to form a parallelepiped through the first fixed portion 502, the second fixed portion 503 and the four connecting rods; the fixed rod 501 is connected to any two connecting rods.

[0055] It should be noted that the first fixing portion 502 and the second fixing portion 503 are planes connected to the cab 100 and the fixed platform 600 respectively. The two ends of the first fixing portion 502 are based on two fixing rods 501 including parallelepipeds. The two fixing rods 501 can be connected by another fixing rod 501, so that the cross-sectional shape of the first fixing portion 502 is an I-shape, which can better ensure the stability of the first fixing portion 502; similarly, the second fixing portion 503 can also adopt the structure of the first fixing portion 502, which will not be repeated here.

[0056] Furthermore, the connecting rod serves as an overall motion structure, and the connecting rod serves as four connecting rods on the side of a planar hexahedron, and any two adjacent connecting rods among the four connecting rods form a plane. Since the driving direction of the hydraulic cylinder 201 is a fixed direction, the direction of the oblique movement of the four connecting rods is also a fixed direction, that is, oblique reciprocating motion along the driving direction of the hydraulic cylinder 201.

[0057] like Figure 1 and Figure 2As shown, in order to ensure that when the cab 100 falls back, the first fixing part 502 and the second fixing part 503 will not be completely fitted, causing friction between the first fixing part 502 and the second fixing part 503, thereby affecting the service life of the lifting bracket 500, in a preferred embodiment of the present invention, the connecting rod includes a first connecting part 504 and a second connecting part 505; the first connecting part 504 and the second connecting part 505 are integrally formed, and the first connecting part 504 and the second connecting part 505 are arranged at an angle; the connecting rod on one side of the parallelepiped close to the hydraulic drive mechanism 200 is hinged to the first fixing part 502 through the first connecting part 504, and the second connecting part 505 is hinged to the second fixing part 503; the connecting rod on the side of the parallelepiped away from the hydraulic drive mechanism 200 is hinged to the first fixing part 502 through the second connecting part 505, and the first connecting part 504 is hinged to the second fixing part 503.

[0058] The first connecting portion 504 and the second connecting portion 505 can be fixed at an angle by means of a circular arc, and the strength can be enhanced at the circular arc transition position between the first connecting portion 504 and the second connecting portion 505. Furthermore, in order to facilitate the oblique reciprocating movement of the lifting bracket 500, the first connecting portion 504 can be in a horizontal direction when the second connecting portion 505 is in a height direction. At this time, the first connecting portion 504 has a height spacing, which can prevent the cab 100 from directly fitting to the position of the second fixing portion 503, which may cause the second fixing portion 503 to rub against the first fixing portion 502. The friction may even cause the first fixing portion 502 and the connecting rod to be stuck. Moreover, since the lifting bracket 500 moves obliquely upward, it is necessary to ensure that the connecting rod has a certain initial height. When the connecting rod is completely in a horizontal direction, the driving force of the hydraulic cylinder 201 will be completely horizontal, making it impossible to drive the connecting rod to move upward based on the driving force of the hydraulic cylinder 201. Therefore, the angle between the first connecting portion 504 and the second connecting portion 505 can ensure that only the driving force of the hydraulic cylinder 201 is required to drive the lifting bracket 500 to move up and down reciprocatingly.

[0059] Preferably, in a preferred embodiment of the present invention, the hinges at any connection points of the parallelepiped are connected via a pin 506 .

[0060] The present embodiment provides an engineering machinery, comprising the liftable cab. Since the technical effects of the engineering machinery provided by the present embodiment are the same as the technical effects of the liftable cab provided by the above-mentioned embodiment, they will not be described in detail here.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liftable cab, characterized in that: include: Cab, hydraulic drive mechanism, reset mechanism, lifting bracket and fixed platform; The lifting bracket is connected to the bottom of the cab, the hydraulic drive mechanism is hinged to the lifting bracket, the hydraulic drive mechanism is used to drive the lifting bracket to reciprocate up and down, the fixed platform is connected to the side of the lifting bracket away from the cab, the fixed end of the hydraulic drive mechanism is connected to the fixed platform, and the fixed platform can be fixedly connected to a plane on the engineering machinery; The hydraulic drive mechanism is used to drive the cab to reciprocate up and down. A control mechanism is provided on the oil inlet line of the hydraulic drive mechanism. The control mechanism is used to control the flow direction of the hydraulic oil of the hydraulic drive mechanism. When the hydraulic oil flows into the hydraulic drive mechanism, the hydraulic drive mechanism is pressurized and the cab is lifted. When the hydraulic oil of the hydraulic drive mechanism flows out, the hydraulic drive mechanism is depressurized and the cab falls back. The reset mechanism is located on the reset oil circuit, the reset oil circuit is connected to the hydraulic drive mechanism, the reset mechanism is arranged in parallel with the control mechanism, and the reset mechanism can be used to control the outflow of hydraulic oil in the hydraulic drive mechanism to release pressure in the hydraulic drive mechanism, so as to adjust the cab to fall back to the original position; The lifting bracket comprises a parallelepiped and a fixing rod which are mutually hinged at a connection point; the parallelepiped comprises a first fixing portion, a second fixing portion and a connecting rod; The first fixing portion is connected to the bottom of the cab, the second fixing portion is connected to the fixed platform, four connecting rods are provided, and two ends of any one of the connecting rods are respectively hinged to the first fixing portion and the second fixing portion, so that the parallelepiped is formed by the first fixing portion, the second fixing portion and the four connecting rods; The fixing rod is connected to any two of the connecting rods; The cross-sectional shapes of the first fixing portion and the second fixing portion are both I-shaped.

2. The liftable cab according to claim 1, characterized in that: The hydraulic drive mechanism comprises a hydraulic cylinder and a cylinder support; The cylinder support is fixedly connected to the fixed platform, the hydraulic cylinder is hinged to the cylinder support, the extended end of the hydraulic cylinder is hinged to the lifting bracket, and the hydraulic cylinder is inclined from one end connected to the cylinder support to the other end.

3. The liftable cab according to claim 2, characterized in that: The control mechanism includes an oil tank, a hydraulic lock, a lifting and reversing valve and a pump; The oil tank is connected to the hydraulic cylinder through the pump, the lifting reversing valve and the hydraulic lock in sequence, and the lifting reversing valve is used to control the flow direction of the hydraulic oil between the oil tank and the hydraulic cylinder to adjust the extension or retraction of the hydraulic cylinder; Both ends of the reset oil circuit are communicated with the oil tank and the hydraulic cylinder respectively.

4. The liftable cab according to claim 3, characterized in that: The control mechanism also includes a one-way throttle valve; The one-way throttle valve is located between the lifting reversing valve and the hydraulic lock and is communicated with the lifting reversing valve. The one-way throttle valve is used to adjust the flow of the hydraulic oil in the oil circuit to adjust the speed of the cab lifting.

5. The liftable cab according to any one of claims 1 to 4, characterized in that: The driving end of the hydraulic driving mechanism is hinged to the fixing rod, and the hydraulic driving mechanism is used to drive the hinge position of the parallelepiped to rotate, so as to drive the cab to reciprocate up and down.

6. The liftable cab according to claim 5, characterized in that: The connecting rod includes a first connecting portion and a second connecting portion; The first connection portion and the second connection portion are integrally formed, and the first connection portion and the second connection portion are arranged at an angle; The connecting rod on one side of the parallelepiped close to the hydraulic drive mechanism is hinged to the first fixing part through the first connecting part, and the second connecting part is hinged to the second fixing part; The connecting rod at a side of the parallelepiped away from the hydraulic drive mechanism is hinged to the first fixing part through the second connecting part, and the first connecting part is hinged to the second fixing part.

7. The elevating cab according to claim 1, characterized in that: The hinges at any connection points of the parallelepiped are all connected through pins.

8. An engineering machine, characterized in that: It comprises a liftable cab as described in any one of claims 1 to 7.

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