CN218165507U - Double-layer stretcher chamber - Google Patents

Abstract

The utility model discloses a double-deck stretcher storehouse, its characterized in that: the stretcher comprises a lower base, wherein a front arm support and a rear arm support are respectively connected to the front end and the rear end of the lower base, a lower layer stretcher chamber is arranged on the lower base, a bracket is arranged above the side of the lower layer stretcher chamber, the front end and the rear end of the bracket are respectively connected with the front arm support and the rear arm support, an upper layer stretcher chamber is arranged on the bracket, the upper layer stretcher chamber is hinged on the bracket through a rotating shaft in the front-back direction, the upper layer stretcher chamber can stand on one side of the lower layer stretcher chamber around the rotating shaft or is horizontally placed on the bracket, and a locking mechanism and a locking assembly are arranged between the upper layer stretcher chamber and the bracket; the front end of the lower layer stretcher chamber is hinged to the front end of the lower base through a first pin shaft in the left-right direction, a first lifting oil cylinder is arranged at the rear end of the lower layer stretcher chamber, a cylinder body of the first lifting oil cylinder is hinged to the rear end of the lower layer stretcher chamber, and a piston rod of the first lifting oil cylinder is hinged to the rear arm frame. The utility model has the advantage of convenient use.

Description

Double-layer stretcher chamber

Technical Field

The utility model relates to a stretcher storehouse technical field, concretely relates to double-deck stretcher storehouse.

Background

The double-layer stretcher chamber is an important rescue tool commonly used in the rescue of patients by medical institutions, is mainly arranged in emergency vehicles and is used for placing medical rescue stretchers. At the present stage, the upper layer stretcher chamber and the lower layer stretcher chamber of the double-layer stretcher chamber are generally fixedly arranged in the frame, medical rescue workers need to consume great strength to lift and transport the medical rescue stretcher to the upper layer stretcher chamber and the lower layer stretcher chamber, and the medical rescue stretcher is very inconvenient to load and cut. At present, the invention patent with patent application number 201510627324.2 discloses a double-layer stretcher chamber, which can tilt the upper layer stretcher chamber forwards when loading a medical rescue stretcher, so that medical rescue workers can conveniently load the medical rescue stretcher on the upper layer stretcher chamber, but the double-layer stretcher chamber still has the following defects: (1) The position of the lower layer stretcher chamber is fixed and cannot be adjusted, so that medical rescue workers still need to spend great effort to lift the medical rescue stretcher to the lower layer stretcher chamber, and the medical rescue stretcher is very inconvenient to use; (2) When the lower layer stretcher chamber is loaded with the medical rescue stretcher and the upper layer stretcher chamber is idle, the distance between the upper layer stretcher chamber and the lower layer stretcher chamber is only 60-70cm, when a patient with light injury sits on the medical rescue stretcher on the lower layer stretcher chamber, the head of the patient often touches the upper layer stretcher chamber carelessly, and the use is inconvenient; and when the patient that the injury is heavier lies on the medical rescue stretcher on the stretcher storehouse of lower floor for sleeping in, carry out the process of first aid measures such as CPR at medical personnel to the patient, medical personnel's head also can often touch upper strata stretcher storehouse carelessly, influences medical personnel to patient's first aid operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a convenient to use's double-deck stretcher storehouse.

In order to achieve the above purpose, the utility model adopts the following technical proposal: a double-layer stretcher chamber comprises a lower base, wherein a front arm support and a rear arm support are respectively connected to the front end and the rear end of the lower base, a lower layer stretcher chamber is arranged on the lower base, a bracket is arranged above the side of the lower layer stretcher chamber, the front end and the rear end of the bracket are respectively connected with the front arm support and the rear arm support, an upper layer stretcher chamber positioned above the lower layer stretcher chamber is arranged on the bracket, the upper layer stretcher chamber is hinged on the bracket through a rotating shaft in the front-back direction, the upper layer stretcher chamber can be upwards turned around the rotating shaft to be vertically erected on one side of the lower layer stretcher chamber so as to increase the available space above the lower layer stretcher chamber or can be downwards turned around the rotating shaft to be horizontally placed on the bracket, a locking mechanism capable of locking and fixing the upper layer stretcher chamber on the bracket when the upper layer stretcher chamber is placed on the bracket is arranged between the upper layer stretcher chamber and the bracket, and a locking assembly capable of ensuring that the upper layer stretcher chamber can be vertically erected when the upper layer is upwards turned around the rotating shaft is arranged between the upper layer stretcher chamber and the bracket; the front end of the lower layer stretcher chamber is hinged to the front end of the lower base through a first pin shaft in the left-right direction, a first lifting oil cylinder is arranged at the rear end of the lower layer stretcher chamber, a cylinder body of the first lifting oil cylinder is hinged to the rear end of the lower layer stretcher chamber through a second pin shaft in the left-right direction, and a piston rod of the first lifting oil cylinder is hinged to the rear arm support through a third pin shaft in the left-right direction.

Further, aforementioned double-deck stretcher storehouse, wherein: the structure of the locking mechanism comprises: install first guide block in the bottom in upper stretcher storehouse, be provided with the first guide hole that link up the guide block in first guide block, wear to be equipped with a locking lever in first guide hole, be fixed with the locking piece on the bracket, be provided with on the locking piece when upper stretcher storehouse is set level and is shelved in the bracket just in time just to the locking lever and supply locking lever male lockhole, can fix upper stretcher storehouse locking on the bracket when the locking lever inserts the lockhole of locking piece.

Further, aforementioned double-deck stretcher storehouse, wherein: the stretcher comprises a first guide block, a lock rod, a second guide block, a lock rod, a spring, a lock rod, a first guide hole, a second guide hole, a handle, a lock rod, a first guide block, a circle of positioning check ring, a lock rod, a second guide hole, a spring and a bracket.

Further, aforementioned double-deck stretcher storehouse, wherein: the lock block is provided with a guide inclined plane which inclines downwards and extends to the inlet of the lock hole, the end part of the lock rod can move towards the lock hole along the guide inclined plane in the process that the lock rod is turned and laid down along with the upper layer stretcher chamber, so that the lock rod can overcome the elastic force of the spring and retract inwards until the lock rod moves to face the lock hole, the lock rod can automatically move outwards under the elastic force of the spring and extend out and is inserted into the lock hole of the lock block, and the upper layer stretcher chamber is locked and fixed on the bracket.

Further, a double-layer stretcher chamber is provided, wherein: the locking assembly is a gas spring arranged between the upper layer stretcher chamber and the bracket, a cylinder body of the gas spring is hinged on the bracket through a fourth pin shaft moving forwards and backwards, and a piston rod of the gas spring is hinged at the bottom of the upper layer stretcher chamber through a fifth pin shaft moving forwards and backwards.

Further, a double-layer stretcher chamber is provided, wherein: the lower end of the front arm support is hinged to the front end of the lower base through a sixth pin shaft in the left-right direction, the lower end of the rear arm support is hinged to the rear end of the lower base through a seventh pin shaft in the left-right direction, a front supporting rod located above the front side of the lower layer stretcher bin is arranged at the front end of the bracket, the front supporting rod is hinged to the upper end of the front arm support through an eighth pin shaft in the left-right direction, a rear supporting rod located above the rear side of the lower layer stretcher bin is arranged at the rear end of the bracket, the rear supporting rod is hinged to the upper end of the rear arm support through a ninth pin shaft in the left-right direction, the front supporting rod, the bracket and the rear supporting rod form a placing platform for placing the upper layer stretcher bin horizontally, the front arm support, the rear arm support, the lower base and the lower base form a four-bar structure convenient for placing or placing the bracket horizontally or forwards, a second lifting oil cylinder is arranged between the lower base and the rear arm support, a cylinder body of the second lifting oil cylinder is hinged to the lower base through a tenth pin shaft in the left-right direction, and a piston rod of the second lifting oil cylinder is hinged to the lower base through an eleventh pin shaft in the left-right direction and hinged to the rear arm support.

Through the implementation of the technical scheme, the beneficial effects of the utility model are that: (1) When the lower layer stretcher chamber is used for loading the medical rescue stretcher, the lower layer stretcher chamber can be inclined downwards, so that medical rescue workers can conveniently load the medical rescue stretcher in the lower layer stretcher chamber, time and labor are saved, and the use is convenient; (2) When the lower floor stretcher storehouse facial make-up carries medical rescue stretcher and upper strata stretcher storehouse and is idle, can upwards turn up upper strata stretcher storehouse and stand in lower floor stretcher storehouse one side, increased the usable space of lower floor stretcher storehouse top, make upper strata stretcher storehouse can not influence medical personnel and carry out first aid operation to the patient of lying the medical rescue stretcher on lower floor stretcher storehouse, also avoid taking the patient of the medical rescue stretcher on lower floor stretcher storehouse to bump the head, improved and taken the comfort level.

Drawings

Fig. 1 is a schematic view of a usage status of a double-layered stretcher chamber according to the present invention.

Fig. 2 is a schematic structural view in the left-hand direction of fig. 1.

Fig. 3 is an enlarged schematic view of a portion a shown in fig. 1.

Fig. 4 is a schematic perspective view of fig. 1.

Fig. 5 is an enlarged schematic view of a portion B shown in fig. 4.

Fig. 6 is another schematic view of the double-layered stretcher chamber of the present invention in use.

Fig. 7 is a schematic perspective view of fig. 6.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, the double-layered litter bin includes a lower base 1, a front arm frame 2 is connected to a front end of the lower base 1, a rear arm frame 3 is connected to a rear end of the lower base 1, a lower litter bin 4 is provided on the lower base 1, a bracket 5 is provided above a side of the lower litter bin 4, a front end of the bracket 5 is connected to the front arm frame 2, a rear end of the bracket 5 is connected to the rear arm frame 3, an upper litter bin 6 located above the lower litter bin 4 is provided on the bracket 5, the upper litter bin 6 is hinged to the bracket 5 by a front-rear rotating shaft 7, the upper litter bin 6 can be vertically erected on one side of the lower litter bin 4 around the rotating shaft 7 to increase an available space above the lower litter bin 4, or can be horizontally erected around the rotating shaft 7 to be placed on the bracket 5, and a locking mechanism capable of fixing the upper litter bin 6 on the bracket 5 and locking the upper bin 6 around the rotating shaft 6 when the upper litter bin 6 is placed horizontally on the bracket 5 is provided between the upper litter bin 6 and the bracket 5; the front end of the lower layer stretcher chamber 4 is hinged with the front end of the lower base 1 through a first pin shaft 8 which moves left and right, a first lift cylinder 9 is arranged at the rear end of the lower layer stretcher chamber 4, a cylinder body of the first lift cylinder 9 is hinged with the rear end of the lower layer stretcher chamber 4 through a second pin shaft 10 which moves left and right, and a piston rod of the first lift cylinder 9 is hinged with the rear arm frame 3 through a third pin shaft 11 which moves left and right, so that when the piston rod of the first lift cylinder 9 retracts, the rear end of the lower layer stretcher chamber 4 can be lifted upwards, the lower layer stretcher chamber 4 is in a forward downward inclined state, the lower layer stretcher chamber 4 can be loaded in the lower layer stretcher chamber 4 quickly, and when the piston rod of the first lift cylinder 9 extends, the lower layer stretcher chamber 4 can be leveled again.

In this embodiment, the structure of the locking mechanism includes: the bottom of the upper layer stretcher chamber 6 is provided with a first guide block 12, the first guide block 12 is internally provided with a first guide hole penetrating through the guide block, a lock rod 13 penetrates through the first guide hole, a lock block 14 is fixed on the bracket 5, the lock block 14 is provided with a lock hole 15 which just faces the lock rod 13 and allows the lock rod 13 to be inserted when the upper layer stretcher chamber 6 is flatly placed on the bracket 5, the lock rod 13 can lock and fix the upper layer stretcher chamber 6 on the bracket 5 when inserted into the lock hole 15 of the lock block 14, and the locking mechanism has simple structure and convenient installation and maintenance; when the upper layer stretcher chamber 6 is laid flatly and placed on the bracket 5 downwards around the rotating shaft 7, the lock rod 13 is inserted into the lock hole 15 of the lock block 14, so that the upper layer stretcher chamber 6 is locked and fixed on the bracket 5, and the upper layer stretcher chamber is prevented from shaking in the use process; when the upper layer stretcher chamber is unlocked, the lock rod 13 is only required to be pulled out of the lock hole 15 of the lock block 14;

in this embodiment, the second guide block 16 is installed at the bottom of the upper layer stretcher chamber 6 on one side of the first guide block 12, the first guide block 12 is relatively close to the lock block 14, the second guide block 16 is relatively far away from the lock block 14, the second guide block 16 is provided with a second guide hole corresponding to the first guide hole, one end of the lock rod 13 is fixed with a handle 17, the other end of the lock rod 13 penetrates through the second guide hole and then penetrates out of the first guide block 12 from the first guide hole, a loop of positioning check ring 18 is arranged on the rod body of the lock rod 13 between the first guide block 12 and the second guide block 16, a spring 19 is sleeved on the lock rod 13 between the positioning check ring 18 and the second guide block 16, two ends of the spring 19 respectively abut against the second guide block 16 and the positioning check ring 18, when the upper layer stretcher chamber 6 is flatly placed on the bracket 5, the lock rod 13 is automatically inserted into the lock hole 15 of the lock block 14 under the elastic force of the spring 19, the upper layer chamber 6 is locked and fixed on the bracket 5, thereby further improving the use stability of the upper layer chamber;

in this embodiment, the lock block 14 has a guide slope 141 extending downward to the entrance of the lock hole 15, and when the lock bar 13 is turned down and laid flat with the upper layer litter compartment 6, the end of the lock bar 13 will move along the guide slope 141 to the lock hole to make the lock bar 13 retract inward against the elastic force of the spring 19, until the lock bar 13 moves to face the lock hole 15, the lock bar 13 will automatically move outward and extend out under the elastic force of the spring 19 and be inserted into the lock hole 15 of the lock block 14, so as to lock and fix the upper layer litter compartment 6 on the bracket 5;

when the guiding inclined plane 141 is not provided, the operation of the worker to put the upright upper stretcher chamber 6 flat and lock it to the bracket 5 is: a worker firstly pulls out the locking rod 13 to retract into the first guide hole 21 through the handle 17, keeps the state that the locking rod 13 retracts into the first guide hole 21, and lays the upper layer stretcher chamber 6 flat on the bracket 5, and then removes the external force applied to the locking rod 13, at the moment, the locking rod 13 can automatically move outwards under the action of the elastic force of the spring 19, extend out and is inserted into the locking hole 15 of the locking block 14, and the upper layer stretcher chamber 6 is locked and fixed on the bracket 5;

after the guide inclined plane 141 is arranged, in the process that the lock rod 13 is turned downwards along with the upper layer stretcher chamber 6 and is laid flat, the end part of the lock rod 13 can automatically overcome the elasticity of the spring 19 along the guide inclined plane 141 and retract into the first guide hole 21 until the lock rod 13 moves to be opposite to the lock hole 15, the lock rod 13 automatically moves outwards under the action of the elasticity of the spring 19 and extends out and is inserted into the lock hole 15 of the lock block 14, so that a worker can automatically complete the action of inserting the lock rod 13 into the lock hole 15 by directly laying the upper layer stretcher chamber 6 flat, the action of firstly pulling out the lock rod before laying the upper layer stretcher chamber flat when the guide inclined plane 141 is not arranged is omitted, and the operation is more convenient;

in this embodiment, the locking component is a gas spring 20 arranged between the upper layer stretcher chamber 6 and the bracket 5, the cylinder body of the gas spring 20 is hinged on the bracket 5 through a fourth pin shaft 21 in the front-back direction, and the piston rod of the gas spring 20 is hinged at the bottom of the upper layer stretcher chamber 6 through a fifth pin shaft 22 in the front-back direction;

in this embodiment, the lower end of the front arm support 2 is hinged to the front end of the lower base 1 through a sixth pin 23 in left-right direction, the lower end of the rear arm support 3 is hinged to the rear end of the lower base 1 through a seventh pin 24 in left-right direction, a front supporting rod 25 positioned above the front side of the lower stretcher chamber 4 is arranged at the front end of the bracket 5, the front supporting rod 25 is hinged to the upper end of the front arm support 2 through an eighth pin 26 in left-right direction, a rear supporting rod 27 positioned above the rear side of the lower stretcher chamber 4 is arranged at the rear end of the bracket 5, the rear supporting rod 27 is hinged to the upper end of the rear arm support 3 through a ninth pin 28 in left-right direction, the front supporting rod 25, the bracket 5 and the rear supporting rod 27 together form a placing platform for placing the upper stretcher chamber 6 horizontally, the front arm support 2, the rear arm support 3, the bracket 5 and the lower base 1 jointly form a four-bar linkage structure which is convenient for the bracket 5 to be laid flat or inclined forwards and downwards, a second lift cylinder 29 is arranged between the lower base 1 and the rear arm support 3, a cylinder body of the second lift cylinder 29 is hinged to the lower base 1 through a tenth pin shaft 30 in the left-right direction, and a piston rod of the second lift cylinder 29 is hinged to the rear arm support 3 through an eleventh pin shaft 31 in the left-right direction, so that when the piston rod of the second lift cylinder 29 retracts, the bracket can be driven to incline forwards and downwards through the four-bar linkage structure, the upper stretcher chamber 6 is driven to incline forwards and downwards synchronously, and when the piston rod of the second lift cylinder 29 extends, the bracket 5 can be driven to be laid flat, the upper stretcher chamber 6 is driven to be laid flat synchronously, and a stretcher can be conveniently assembled and disassembled on the upper stretcher chamber 6.

The working principle of the utility model is as follows:

the operation of loading the medical rescue stretcher in the lower layer stretcher chamber is as follows: firstly, retracting a piston rod of the first lifting oil cylinder 9 to drive the rear end of the lower layer stretcher chamber 4 to be lifted upwards, so that the lower layer stretcher chamber 4 is in a forward and downward inclined state, then sliding the medical rescue stretcher into the lower layer stretcher chamber 4, after the medical rescue stretcher completely enters the lower layer stretcher chamber 4, extending the piston rod of the first lifting oil cylinder 9 out, and re-flatting the lower layer stretcher chamber 4;

when the lower layer stretcher chamber is loaded with the medical rescue stretcher and the upper layer stretcher chamber is idle, the upper layer stretcher chamber 6 is overturned upwards around the rotating shaft 7 to be in an upright state by overcoming the acting force of the air spring 20, so that the upper layer stretcher chamber 6 is erected on one side of the lower layer stretcher chamber 4, and the available space above the lower layer stretcher chamber 4 is increased, at the moment, the upper layer stretcher chamber cannot influence medical personnel to carry out emergency treatment operation on a patient lying on the medical rescue stretcher chamber on the lower layer stretcher chamber, the patient of the medical rescue stretcher on the lower layer stretcher chamber is prevented from bumping into the head, and the riding comfort level is improved; when the upper layer stretcher chamber needs to be used, the upper layer stretcher chamber 6 is turned downwards and laid flat on the bracket 5 by directly overcoming the acting force of the gas spring 20, and at the moment, the lock rod 13 at the bottom of the upper layer stretcher chamber 6 can be automatically inserted into the lock hole 15 of the lock block 14 on the bracket 5, so that the upper layer stretcher chamber 6 is locked and fixed on the bracket 5.

The utility model has the advantages that: (1) When the lower layer stretcher chamber is loaded with the medical rescue stretcher, the lower layer stretcher chamber can be inclined downwards, so that medical rescue workers can conveniently load the medical rescue stretcher in the lower layer stretcher chamber, time and labor are saved, and the medical rescue stretcher is convenient to use; (2) When the lower floor stretcher storehouse facial make-up carries medical rescue stretcher and upper strata stretcher storehouse and is idle, can upwards turn up upper strata stretcher storehouse and stand in lower floor stretcher storehouse one side, increased the usable space of lower floor stretcher storehouse top, make upper strata stretcher storehouse can not influence medical personnel and carry out first aid operation to the patient of lying the medical rescue stretcher on lower floor stretcher storehouse, also avoid taking the patient of the medical rescue stretcher on lower floor stretcher storehouse to bump the head, improved and taken the comfort level.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any modifications or equivalent changes made in accordance with the technical spirit of the present invention are also within the scope of the present invention.

Claims (6)

1. A double-layer stretcher chamber is characterized in that: the stretcher comprises a lower base, wherein a front arm support and a rear arm support are respectively connected to the front end and the rear end of the lower base, a lower layer stretcher chamber is arranged on the lower base, a bracket is arranged above the side of the lower layer stretcher chamber, the front end and the rear end of the bracket are respectively connected with the front arm support and the rear arm support, an upper layer stretcher chamber positioned above the lower layer stretcher chamber is arranged on the bracket, the upper layer stretcher chamber is hinged on the bracket through a rotating shaft in the front-back direction, can be upwards turned around the rotating shaft to be vertically erected on one side of the lower layer stretcher chamber so as to increase the available space above the lower layer stretcher chamber or can be downwards turned around the rotating shaft to be horizontally laid on the bracket, a locking mechanism capable of locking and fixing the upper layer stretcher chamber on the bracket when the upper layer stretcher chamber is laid on the bracket is arranged between the upper layer stretcher chamber and the bracket, and a locking component capable of ensuring that the upper layer stretcher chamber can be vertically erected when the upper layer stretcher chamber is upwards turned around the rotating shaft is arranged between the upper layer stretcher chamber and the bracket; the front end of the lower layer stretcher chamber is hinged to the front end of the lower base through a first pin shaft in the left-right direction, a first lifting oil cylinder is arranged at the rear end of the lower layer stretcher chamber, a cylinder body of the first lifting oil cylinder is hinged to the rear end of the lower layer stretcher chamber through a second pin shaft in the left-right direction, and a piston rod of the first lifting oil cylinder is hinged to the rear arm support through a third pin shaft in the left-right direction.

2. The double-layered litter bin of claim 1 wherein: the structure of the locking mechanism comprises: install first guide block in the bottom in upper stretcher storehouse, be provided with the first guide hole that link up the guide block in first guide block, wear to be equipped with a locking lever in first guide hole, be fixed with the locking piece on the bracket, be provided with on the locking piece when upper stretcher storehouse is set level and is shelved in the bracket just in time just to the locking lever and supply locking lever male lockhole, can fix upper stretcher storehouse locking on the bracket when the locking lever inserts the lockhole of locking piece.

3. The double-layered litter bin of claim 2 wherein: the stretcher comprises a first guide block, a lock rod, a second guide block, a lock rod, a spring, a lock rod, a first guide hole, a second guide hole, a handle, a lock rod, a first guide block, a circle of positioning check ring, a lock rod, a second guide hole, a spring and a bracket.

4. The double-layered litter bin of claim 3 wherein: the lock block is provided with a guide inclined plane which slants downwards and extends to the inlet of the lock hole, the end part of the lock rod can move towards the lock hole along the guide inclined plane in the process that the lock rod is turned downwards and laid flat along with the upper layer stretcher chamber, so that the lock rod can retract inwards by overcoming the elastic force of the spring until the lock rod moves to face the lock hole, the lock rod can automatically move outwards under the elastic force of the spring and extend out to be inserted into the lock hole of the lock block, and the upper layer stretcher chamber is locked and fixed on the bracket.

5. The double-layered litter bin of claim 1 or 2 or 3 or 4 wherein: the locking assembly is an air spring arranged between the upper layer stretcher chamber and the bracket, the cylinder body of the air spring is hinged on the bracket through a fourth pin shaft moving forwards and backwards, and the piston rod of the air spring is hinged at the bottom of the upper layer stretcher chamber through a fifth pin shaft moving forwards and backwards.

6. The double-layered litter bin of claim 5 wherein: the lower end of the front arm support is hinged to the front end of the lower base through a sixth pin shaft in the left-right direction, the lower end of the rear arm support is hinged to the rear end of the lower base through a seventh pin shaft in the left-right direction, a front supporting rod located above the front side of the lower layer stretcher bin is arranged at the front end of the bracket, the front supporting rod is hinged to the upper end of the front arm support through an eighth pin shaft in the left-right direction, a rear supporting rod located above the rear side of the lower layer stretcher bin is arranged at the rear end of the bracket, the rear supporting rod is hinged to the upper end of the rear arm support through a ninth pin shaft in the left-right direction, the front supporting rod, the bracket and the rear supporting rod form a placing platform for placing the upper layer stretcher bin horizontally, the front arm support, the rear arm support, the lower base and the lower base form a four-bar structure convenient for placing or placing the bracket horizontally or forwards, a second lifting oil cylinder is arranged between the lower base and the rear arm support, a cylinder body of the second lifting oil cylinder is hinged to the lower base through a tenth pin shaft in the left-right direction, and a piston rod of the second lifting oil cylinder is hinged to the lower base through an eleventh pin shaft in the left-right direction and hinged to the rear arm support.

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