阅读说明：本技术 一种矿用自卸车用具有除尘结构的驾驶室 (Cab with dust removal structure for mining dump truck ) 是由 邹洪彬 黄顺和 李登科 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种矿用自卸车用具有除尘结构的驾驶室,包括驾驶室外壳、进风口、通风口和电机,所述驾驶室外壳的正面外壁固定安装有进风口,所述驾驶室外壳的内部底端设置有通风口,所述通风口的内壁上下两侧皆开设有滑槽,所述通风口内壁中间位置处固定安装有电机,且电机的输出端设置有清扫机构,所述通风口的两端顶端开设有进气管,两组所述进气管靠近驾驶室外壳中心位置的一端开设有收纳槽,所述进气管的内壁插设有过滤板。本发明通过设置有清扫机构,可以对通风口的进行往复清扫,从而避免大量的灰尘发生堆积,进而造成堵塞的情况,更换机构可以使人员在工作的过程中快速对过滤板进行更换,使用快速。(The invention discloses a cab with a dust removal structure for a mining dump truck, which comprises a cab shell, an air inlet, a vent and a motor, wherein the air inlet is fixedly arranged on the outer wall of the front side of the cab shell, the vent is arranged at the bottom end inside the cab shell, sliding grooves are formed in the upper side and the lower side of the inner wall of the vent, the motor is fixedly arranged in the middle of the inner wall of the vent, a cleaning mechanism is arranged at the output end of the motor, air inlet pipes are arranged at the top ends of the two ends of the vent, accommodating grooves are formed in the ends of the two groups of air inlet pipes close to the center of the cab shell, and a filter plate is. The filter plate cleaning device is provided with the cleaning mechanism, so that the vent can be cleaned in a reciprocating manner, the condition that a large amount of dust is accumulated to cause blockage is avoided, and the filter plate can be quickly replaced by personnel in the working process and is quick to use.)

1. The utility model provides a mining dump truck is with driver's cabin that has dust removal structure, includes driver's cabin shell (1), air intake (2), vent (3) and motor (6), its characterized in that: the front outer wall fixed mounting of driver's cabin shell (1) has air intake (2), the inside bottom of driver's cabin shell (1) is provided with vent (3), the position department that both sides about vent (3) are located inside driver's cabin shell (1) has seted up spout (4), the intermediate position department fixed mounting that vent (3) are located inside driver's cabin shell (1) has motor (6), and the output of motor (6) is provided with cleans the mechanism, intake pipe (11) have been seted up on the both ends top of vent (3), two sets of intake pipe (11) are close to the one end of driver's cabin shell (1) central point and have been seted up and accomodate groove (13), the inner wall of intake pipe (11) is inserted and is equipped with filter (14), the inner wall bottom fixed mounting of intake pipe (11) has bracing piece (15), the top central point department fixed mounting of bracing piece (15) has loop bar, and a push rod (18) is inserted in the sleeve rod (16), a first spring (17) is sleeved on the outer wall of the push rod (18), one side, far away from the two groups of air inlet pipes (11), of each group of air inlet pipes is provided with a groove (12), and a replacing mechanism is arranged in each groove (12).

2. The cab with the dust removing structure for the mining dump truck according to claim 1, characterized in that: clean the mechanism and include lantern ring (5), bull stick (7), extrusion piece (8), connecting rod (9) and clean piece (10), the output fixed mounting of motor (6) has bull stick (7), the outer wall fixed mounting of bull stick (7) has extrusion piece (8), and the outer wall of extrusion piece (8) has cup jointed lantern ring (5), lantern ring (5) set up the inside at spout (4), the both ends of the lantern ring (5) are all fixed mounting have connecting rod (9), the one end fixed mounting that lantern ring (5) were kept away from in connecting rod (9) has cleaning piece (10).

3. The cab with the dust removing structure for the mining dump truck according to claim 1, characterized in that: the replacing mechanism comprises a stop block (19), a second spring (20), a first sliding rod (21), a first clamping tooth (22), a first gear (23), a second gear (24), a second sliding rod (25) and a second clamping tooth (26), the stop block (19) is inserted into both sides of the inner wall of the air inlet pipe (11), the second spring (20) is fixedly installed on one side, close to the inner wall of the air inlet pipe, of the stop block (19), the first sliding rod (21) is fixedly installed at one end, close to the inner wall of the slot (12), of the stop block (19) extending to the inner wall of the slot (12), the first clamping tooth (22) is fixedly installed at the bottom end of the first sliding rod (21), the first gear (23) is meshed with the bottom end of the first clamping tooth (22), the second gear (24) is meshed with the bottom end of the first gear (23), the second sliding rod (25) is inserted into the bottom end of the slot (12), and a second latch (26) is fixedly arranged at the top end of the second sliding rod (25).

4. The cab with the dust removing structure for the mining dump truck according to claim 2, characterized in that: the air inlet (2) is communicated with the inside of the vent (3), the two ends of the vent (3) are communicated with the outside through the bottom end of the cab shell (1) respectively, the diameter of the inner wall of the vent (3) is matched with the diameter of the outer wall of the cleaning block (10), and the cleaning block (10) and the vent (3) form a sliding structure.

5. The cab with the dust removing structure for the mining dump truck according to claim 2, characterized in that: the shape of lantern ring (5) is the annular, extrusion piece (8) are triangle-shaped, extrusion piece (8) constitute rotating-structure in the inside of lantern ring (5), the both ends of lantern ring (5) extend to two sets of respectively the inside of spout (4), lantern ring (5) and spout (4) constitute sliding construction.

6. The cab with the dust removing structure for the mining dump truck according to claim 3, characterized in that: the inner wall one end that dog (19) are close to intake pipe (11) sets up for convex slope, dog (19) are provided with two sets ofly, and are two sets of dog (19) are located the inner wall both sides of intake pipe (11) respectively, the notch has been seted up with the inner wall of accomodating groove (13) in intake pipe (11), intake pipe (11) are linked together with the inside of accomodating groove (13), and this notch is located two sets of the below of dog (19), the inner wall top of accomodating groove (13) is provided with the closing cap.

7. The cab with the dust removing structure for the mining dump truck according to claim 3, characterized in that: the outer wall of the first sliding rod (21) extending to the inside of the groove (12) is provided with a mounting hole matched with the second spring (20), one end of the second spring (20) is fixedly welded with the inner wall of the mounting hole, the other end of the second spring (20) is fixedly welded with the outer wall of the stop block (19), and the second spring (20) and the stop block (19) form an elastic structure.

8. The cab with the dust removing structure for the mining dump truck according to claim 3, characterized in that: first latch (22) and first gear (23) intermeshing, first gear (23) and second gear (24) intermeshing, second gear (24) and second latch (26) intermeshing, second gear (24) constitutes transmission structure through first gear (23) and first latch (22), transmission structure is constituteed through second latch (26) and second slide bar (25) in second gear (24), transmission structure is constituteed through first gear (23) and second gear (24) and second slide bar (25) in first slide bar (21).

9. The cab with the dust removing structure for the mining dump truck according to claim 3, characterized in that: the diameter of the outer wall of the first gear (23) is larger than that of the outer wall of the second gear (24), the second sliding rod (25) extends to the inside of the air inlet pipe (11), the notches of the second sliding rod (25) and the accommodating groove (13) are located on the same horizontal line, and the diameter of the inner wall of each notch is larger than that of the outer wall of the filter plate (14).

Technical Field

The invention relates to the technical field of mining dump trucks, in particular to a cab with a dust removal structure for a mining dump truck.

Background

The mining dump truck is a specialized vehicle used for completing tasks such as rock earthwork transportation, ore transportation and the like in an open-air occasion, and is mainly used for large-scale construction sites such as open-air mines, ports and docks, water conservancy and hydropower sites, traffic infrastructure construction and the like.

But the inside leakproofness of current driver's cabin is relatively poor, can not work under adverse circumstances, and a large amount of dust in the external world enter into the inside of driver's cabin easily simultaneously, and then influence navigating mate's healthy, therefore the driver's cabin that has dust removal structure for mining dump truck is needed to solve above-mentioned problem urgently.

Disclosure of Invention

The invention aims to provide a cab with a dust removal structure for a mining dump truck, and aims to solve the problem that a large amount of external dust is easy to enter the cab in the background technology, so that the physical health of a driver is affected.

In order to achieve the purpose, the invention provides the following technical scheme: a cab with a dust removal structure for a mining dump truck comprises a cab shell, an air inlet, a vent and a motor, wherein the air inlet is fixedly arranged on the outer wall of the front side of the cab shell, the vent is arranged at the bottom end of the inner part of the cab shell, sliding grooves are formed in positions, which are positioned on the upper side and the lower side of the vent, of the inner part of the cab shell, the motor is fixedly arranged at the middle position, which is positioned at the vent, of the inner part of the cab shell, a cleaning mechanism is arranged at the output end of the motor, air inlet pipes are arranged at the top ends of the two ends of the vent, two sets of air inlet pipes are provided with accommodating grooves at one ends, which are close to the central position of the cab shell, filter plates are inserted into the inner wall of the air inlet pipes, a support rod is, the outer wall of the ejector rod is sleeved with a first spring, one side, far away from the two groups of air inlet pipes, of the ejector rod is provided with a groove, and a replacing mechanism is arranged inside the groove.

Preferably, clean the mechanism and include the lantern ring, bull stick, extrusion piece, connecting rod and clean the piece, the output fixed mounting of motor has the bull stick, the outer wall fixed mounting of bull stick has the extrusion piece, and the outer wall of extrusion piece has cup jointed the lantern ring, the lantern ring sets up the inside at the spout, the both ends of the lantern ring are fixed mounting all to have the connecting rod, the one end fixed mounting that the lantern ring was kept away from to the connecting rod has the cleaning piece.

Preferably, it includes dog, second spring, first slide bar, first latch, first gear, second slide bar and second latch to change the mechanism, the inner wall both sides of intake pipe are all inserted and are equipped with the dog, and one side fixed mounting that is close to the intake pipe inner wall of dog has the second spring, is close to the one end fixed mounting that the dog of fluting inner wall extended to the fluting inner wall has first slide bar, the bottom fixed mounting of first slide bar has first latch, the bottom meshing of first latch has first gear, the bottom meshing of first gear has the second gear, the notched bottom is inserted and is equipped with the second slide bar, and the top fixed mounting of second slide bar has the second latch.

Preferably, the air inlet is communicated with the inside of the vent, two ends of the vent respectively penetrate through the bottom end of the cab shell and are communicated with the outside, the diameter of the inner wall of the vent is matched with the diameter of the outer wall of the cleaning block, and the cleaning block and the vent form a sliding structure.

Preferably, the lantern ring is annular, the extrusion piece is triangle-shaped, the extrusion piece constitutes rotating-structure in the inside of lantern ring, the both ends of lantern ring extend to the inside of two sets of spout respectively, the lantern ring constitutes sliding structure with the spout.

Preferably, the inner wall one end that the dog is close to the intake pipe sets up for convex slope, the dog is provided with two sets ofly, two sets ofly the dog is located the inner wall both sides of intake pipe respectively, the notch has been seted up with the inner wall of accomodating the groove to the intake pipe, the intake pipe is linked together with the inside of accomodating the groove, and this notch is located two sets ofly the below of dog, the inner wall top of accomodating the groove is provided with the closing cap.

Preferably, the outer wall of the first sliding rod extending to the inside of the groove is provided with a mounting hole matched with the second spring, one end of the second spring is fixedly welded with the inner wall of the mounting hole, the other end of the second spring is fixedly welded with the outer wall of the stop block, and the second spring and the stop block form an elastic structure.

Preferably, the first latch is engaged with the first gear, the first gear is engaged with the second gear, the second gear is engaged with the second latch, the second gear forms a transmission structure with the first latch through the first gear, the second gear forms a transmission structure with the second slide bar through the second latch, and the first slide bar forms a transmission structure with the second slide bar through the first gear and the second gear.

Preferably, the diameter of the outer wall of the first gear is larger than that of the outer wall of the second gear, the second sliding rod extends to the inside of the air inlet pipe, the notches of the second sliding rod and the accommodating groove are located on the same horizontal line, and the diameter of the inner wall of each notch is larger than that of the outer wall of the filter plate.

Compared with the prior art, the invention has the beneficial effects that: this mining dump truck is with driver's cabin that has dust removal structure is provided with cleans the mechanism, can be to reciprocating cleaning of vent to avoid a large amount of dust to take place to pile up, and then cause the condition of jam, convenient to use, change mechanism can make personnel change the filter fast at the in-process of work, and it is quick to use, convenient to use.

1. The device is provided with cleans the mechanism, it rotates to drive the bull stick through the motor and rotates, the bull stick drives the extrusion piece afterwards and rotates, and then make the extrusion piece drive the lantern ring and remove, can make the lantern ring remove in the inside of spout simultaneously, it is spacing to make the spout carry out the lantern ring, avoid the lantern ring to take place the condition of rocking, the lantern ring drives the connecting rod afterwards and cleans the piece and carries out reciprocating motion, can make and clean the piece and clean the inner wall of vent, avoid a large amount of dust to take place accumulational condition, and then make the inside ventilation effect of vent better, can make a large amount of dust directly discharge simultaneously, can make the driver's cabin shell use for a long time.

2. The device is provided with the change mechanism, after the condition that the filter takes place to block up, with the inside of new filter embedding intake pipe, new filter extrudees the dog afterwards, and then make the dog drive first slide bar and remove, drive the second slide bar through first gear and second gear and remove, the filter that will change removes to the position department of fluting notch, the second slide bar removes to drive old filter and gets into to accomodate the inside of groove and accomodate, the ejector pin extrudees new filter simultaneously, thereby make the filter remove to the position department of dog, accomplish the change of filter, can avoid the in-process of changing, the inside of the outdoor shell of driver's cabin is entered into to a large amount of dust, simultaneously, and is convenient to change the filter, and the operation is simple, and the use is convenient.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic front sectional view of the present invention;

FIG. 3 is a schematic top view of a partial cross-sectional structure of the present invention;

FIG. 4 is a front view of the collar and sweeper block of the present invention;

FIG. 5 is a front view of the air inlet tube of the present invention;

FIG. 6 is a schematic top view of the intake duct and the storage tank according to the present invention;

fig. 7 is an enlarged view of a portion a of fig. 5 according to the present invention.

In the figure: 1. a cab housing; 2. an air inlet; 3. a vent; 4. a chute; 5. a collar; 6. a motor; 7. a rotating rod; 8. extruding the block; 9. a connecting rod; 10. cleaning the block; 11. an air inlet pipe; 12. grooving; 13. a receiving groove; 14. a filter plate; 15. a support bar; 16. a loop bar; 17. a first spring; 18. a top rod; 19. a stopper; 20. a second spring; 21. a first slide bar; 22. a first latch; 23. a first gear; 24. a second gear; 25. a second slide bar; 26. and a second latch.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, an embodiment of the present invention is shown:

a cab with a dust removal structure for a mining dump truck comprises a cab shell 1, an air inlet 2, a vent 3 and a motor 6, wherein the air inlet 2 is fixedly installed on the outer wall of the front side of the cab shell 1, the vent 3 is arranged at the bottom end inside the cab shell 1, sliding grooves 4 are formed in the upper side and the lower side of the inner wall of the vent 3, the motor 6 is fixedly installed at the middle position of the inner wall of the vent 3, a cleaning mechanism is arranged at the output end of the motor 6 and comprises a lantern ring 5, a rotating rod 7, an extrusion block 8, a connecting rod 9 and a cleaning block 10, the rotating rod 7 is fixedly installed at the output end of the motor 6, an extrusion block 8 is fixedly installed on the outer wall of the rotating rod 7, the outer wall of the extrusion block 8 is sleeved with a lantern ring 5, the lantern ring 5 is arranged inside the sliding grooves 4, the lantern ring 5 is annular, the extrusion, the both ends of the lantern ring 5 extend to the inside of two sets of spouts 4 respectively, the lantern ring 5 constitutes sliding structure with spout 4, spout 4 carries on spacingly to lantern ring 5, and then make lantern ring 5 can only remove about, extrusion piece 8 rotates in the inside of the lantern ring 5 afterwards, thereby make lantern ring 5 carry out reciprocating motion, can make lantern ring 5 drive connecting rod 9 carry out reciprocating motion, thereby make the dust follow the inside discharge of vent 3, can avoid the dust to pile up in a large number, reduce the condition that vent 3 took place to block up, the operation is simple, high durability and convenient use.

The both ends of lantern ring 5 all fixed mounting have connecting rod 9, the one end fixed mounting that lantern ring 5 was kept away from to connecting rod 9 has cleaning block 10, air intake 2 is linked together with the inside of vent 3, the both ends of vent 3 are run through the bottom of driver's cabin shell 1 respectively and are linked together with the external world, the diameter of the inner wall of vent 3 matches each other with the outer wall diameter of cleaning block 10, clean block 10 and vent 3 and constitute sliding construction, clean block 10 slides at the inner wall of vent 3, thereby make cleaning block 10 clean the inner wall of vent 3, and then make the dust discharge through the both sides of vent 3, avoid the dust to take place accumulational condition, make the dust can discharge in the work, make the work more convenient, high durability and convenient use.

The top ends of two ends of the air vent 3 are provided with air inlet pipes 11, one end of each of the two air inlet pipes 11 close to the central position of the cab shell 1 is provided with a receiving groove 13, the inner wall of each air inlet pipe 11 is inserted with a filter plate 14, the bottom end of the inner wall of each air inlet pipe 11 is fixedly provided with a support rod 15, the central position of the top end of each support rod 15 is fixedly provided with a loop bar 16, a mandril 18 is inserted inside the loop bar 16, the outer wall of the mandril 18 is sleeved with a first spring 17, one side of each of the two air inlet pipes 11 away from each other is provided with a slot 12, a replacing mechanism is arranged inside the slot 12 and comprises a stop block 19, a second spring 20, a first slide bar 21, a first latch 22, a first gear 23, a second gear 24, a second slide bar 25 and a second latch 26, the stop blocks 19 are inserted on two sides of the inner wall, one end of the stop block 19, which is close to the inner wall of the air inlet pipe 11, is obliquely arranged in a circular arc shape, two groups of stop blocks 19 are arranged, the two groups of stop blocks 19 are respectively positioned at two sides of the inner wall of the air inlet pipe 11, the air inlet pipe 11 and the inner wall of the accommodating groove 13 are provided with notches, the air inlet pipe 11 is communicated with the inside of the accommodating groove 13, the notches are positioned below the two groups of stop blocks 19, the top end of the inner wall of the accommodating groove 13 is provided with a sealing cover, a new filter plate 14 is pressed, so that the filter plate 14 enters the air inlet pipe 11, then the new filter plate 14 extrudes the stop blocks 19, the stop blocks 19 start to shrink along the inclined surface, the stop blocks 19 drive the first slide bars 21 to move, then the first slide bars 21 drive the first latch 22 to move, the first latch 22 drives the first gear 23 to rotate, the first gear 23 drives the second gear 24 to rotate, then, receive new filter 14 extrusion simultaneously, make old filter 14 just in time be in the notch position department of accomodating groove 13, thereby make second slide bar 25 promote old filter 14 and enter into the inside of notch, the inside that gets into accomodating groove 13 afterwards is accomodate, thereby the completion is to filter 14's change, it is simpler to make the change, simultaneously can avoid the in-process at the change, the dust a large amount of circumstances of entering into 1 inside of driver's cabin shell, the air permeability and the dust removal effect that make driver's shell 1 are better, and then make driver's driving environment more comfortable.

The one end fixed mounting that the dog 19 that is close to fluting 12 inner wall extends to fluting 12 inner wall has first slide bar 21, first slide bar 21 extends to the inside outer wall of fluting 12 and is provided with the installation hole with second spring 20 assorted, and the one end of second spring 20 and the inner wall fixed welding of installation hole, the other end of second spring 20 and the outer wall fixed welding of dog 19, second spring 20 constitutes elastic construction with dog 19, filter 14 is at the in-process of changing, new filter 14 extrudees dog 19, make dog 19 begin to contract along the inclined plane, can make filter 14 enter into the inside of intake pipe 11 afterwards, second spring 20 drives dog 19 and restores afterwards, thereby make dog 19 fix filter 14, avoid filter 14 to take place the condition that breaks away from in intake pipe 11 is inside, high durability and convenient use.

A first latch 22 is fixedly mounted at the bottom end of the first slide bar 21, a first gear 23 is engaged at the bottom end of the first latch 22, a second gear 24 is engaged at the bottom end of the first gear 23, a second slide bar 25 is inserted at the bottom end of the slot 12, a second latch 26 is fixedly mounted at the top end of the second slide bar 25, the first latch 22 is engaged with the first gear 23, the first gear 23 is engaged with the second gear 24, the second gear 24 is engaged with the second latch 26, the second gear 24 forms a transmission structure with the first latch 22 through the first gear 23, the second gear 24 forms a transmission structure with the second slide bar 25 through the second latch 26, the first slide bar 21 forms a transmission structure with the second slide bar 25 through the first gear 23 and the second gear 24, the stopper 19 drives the first slide bar 21 to move in the moving process, and then the first latch 22 is driven by the first slide bar 21 to move, the first latch 22 drives the first gear 23 to rotate, the first gear 23 drives the second gear 24 to rotate, because the diameter of the first gear 23 is larger than that of the second gear 24, the rotation amplitude of the second gear 24 can be larger than that of the first gear 23, and then the second gear 24 drives the second slide bar 25 to move through the second latch 26, so that the second slide bar 25 can extrude and replace the old filter plate 14.

The outer wall diameter of first gear 23 is greater than the outer wall diameter of second gear 24, second slide bar 25 extends to the inside of intake pipe 11, and second slide bar 25 and the notch department of accomodating groove 13 are located same horizontal line, the inner wall diameter of this notch is greater than the outer wall diameter of filter 14, old filter 14 is moving down, second slide bar 25 extrudees filter 14, thereby make second slide bar 25 promote filter 14 and enter into the inside of notch, enter into the inside of accomodating groove 13 afterwards, and then accomplish and accomodate and change old filter 14, extrude new filter 14 through the elasticity of ejector pin 18 through 17 afterwards, make filter 14 install the inside at intake pipe 11, it is more convenient to make filter 14 change, avoid simultaneously entering into the inside condition of cockpit shell 1 in a large amount of dust at the in-process of changing, high durability and convenient use.

The working principle is as follows: when the dust collector is used, external air is brought into the ventilation opening 3 by the air inlet 2, then the air enters the cab shell 1 through the filter plate 14 and is used by people inside the cab shell 1, the ventilation inside the cab drives the external air to enter the cab, further dust contained in the air is blocked by the filter plate 14 and enters the accommodating groove 13, then the motor 6 drives the rotating rod 7 to rotate, the rotating rod 7 drives the extrusion block 8 to rotate, then the extrusion block 8 rotates inside the sleeve ring 5, so that the sleeve ring 5 reciprocates, the sleeve ring 5 drives the connecting rod 9 to reciprocate, then the connecting rod 9 drives the cleaning block 10 to move, further the cleaning block 10 cleans the inner wall of the ventilation opening 3, further the dust is discharged through two sides of the ventilation opening 3, and the condition that the dust is accumulated is avoided, the dust can be discharged when the dust collecting device works, so that the dust cannot be blocked when a driver works for a long time, the working comfort of the driver is better, and the working efficiency is improved.

When a large amount of dust causes the filter plate 14 to be blocked, the new filter plate 14 is embedded into the air inlet pipe 11, then the new filter plate 14 extrudes the stopper 19, the stopper 19 begins to contract along the inclined surface, the stopper 19 drives the first slide bar 21 to move, then the first slide bar 21 drives the first latch 22 to move, the first latch 22 drives the first gear 23 to rotate, the first gear 23 drives the second gear 24 to rotate, then the second gear 24 drives the second slide bar 25 to move through the second latch 26, and simultaneously the new filter plate 14 extrudes, so that the old filter plate 14 is just at the notch position of the accommodating groove 13, thereby the second slide bar 25 pushes the old filter plate 14 to enter the notch, and then enters the accommodating groove 13, thereby completing the accommodating and replacing of the old filter plate 14, and then the new filter plate 14 is extruded through the ejector rod 18, meanwhile, the second spring 20 drives the stop block 19 to recover, so that the stop block 19 fixes the filter plate 14, the situation that the filter plate 14 is separated from the inside of the air inlet pipe 11 is avoided, the filter plate 14 is more convenient to replace, and meanwhile, the situation that dust enters the cab shell 1 in a large amount in the replacement process is avoided.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.