A scissors-type aerial work platform with a maintenance-friendly electric push rod and a maintenance method

Abstract

The present application relates to scissor aerial work platform technical field, specifically to a kind of scissor aerial work platform of maintenance convenient to repair lifting push rod, including scissor frame and electric push rod device, the electric push rod device includes piston rod and stem head, the piston rod is driven by telescoping to lift the scissor frame, the stem head is rotatably connected with the scissor frame, the stem head is detachably fixed in the upper end of the piston rod.When electric push rod device fails and is stuck, the overall maintenance process is easy and fast to operate, reduces the workload of maintenance personnel, saves maintenance time, improves maintenance efficiency;And do not need to disassemble scissor frame, also make the structure precision of scissor frame itself not be affected, when using after maintenance, let can guarantee the position precision of aerial work platform, ensure that use effect is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of scissor aerial work platforms, in particular to a scissor aerial work platform with an electric push rod convenient to maintain and a maintenance method. BACKGROUND

[0002] The scissor aerial work platform is a special equipment for high-altitude operation with wide application. The scissor mechanical structure of the scissor aerial work platform makes the lifting platform have high stability, wide operation platform and high carrying capacity, so that the high-altitude operation range is larger and multiple people can work at the same time. It makes the high-altitude operation more efficient and safer. The scissor aerial work platform has a lifting mechanism, which specifically adopts a mode of a hydraulic cylinder driving a push rod to operate, or an electric push rod. The hydraulic system is not suitable for use in high-temperature and fire-prone environments, has a high price, high maintenance cost, too many conversion links leading to large energy loss in the transmission process, and often leaks oil, which pollutes the working environment. Therefore, many customers will choose a scissor aerial work platform with an electric push rod as the lifting mechanism when purchasing.

[0003] For example, the applicant previously completed a patent application with the publication number CN114572911A, which discloses a scissor lifting assembly, comprising a scissor frame, a lifting mechanism and a weighing mechanism. A rotary connecting rod is transversely arranged on the scissor frame, and the rotary connecting rod can rotate around its central axis relative to the scissor frame. The lifting mechanism includes a drive base, a transmission device located in the drive base, a push rod with a bottom end connected to the transmission device and a top end extending out of the drive base, and a drive motor providing power for the transmission device. The lower end of the drive base is rotationally connected to the scissor frame, the top end of the push rod is fixed with a rotary sleeve, and the rotary sleeve is fixedly arranged on the outer periphery of the rotary connecting rod. The weighing mechanism is arranged on the rotary sleeve and the rotary connecting rod, and can measure the load of the rotary connecting rod. The lifting mechanism in this patent adopts an electric push rod, the lower end of the drive base is rotationally connected to the scissor frame through the rotary connecting rod, and the top end of the push rod is also rotationally connected to the scissor frame through the rotary connecting rod. In this specification, the electric push rod device refers to the whole lifting mechanism, that is, the upper and lower ends of the electric push rod device are rotationally connected to the scissor frame through the rotary connecting rod. The inner rods and outer rods on both sides of the scissor frame are staggered to form a structure similar to scissors. When the scissor frame is in the folded state, the inner rods and outer rods on the same side are parallel and the outer side wall of the inner rod abuts against the inner side wall of the outer rod. Therefore, the rotary connecting rods connected to the upper and lower ends of the electric push rod device are arranged between the inner rods on both sides, so as not to interfere with the outer rods.

[0004] In use, if the electric push rod device fails and is stuck, the electric push rod device cannot be retracted or extended, and usually needs to be removed from the scissor frame for maintenance or directly replaced. At this time, due to the structure of the scissor frame, two situations may occur. One is that the scissor frame is in an expanded state when the failure occurs. At this time, the outer side wall of the inner rod is exposed, and the connection between the two rotary links connected to the upper and lower ends of the electric push rod device on the inner rod is also exposed. The two rotary links can be directly removed, so that the electric push rod device can be removed as a whole. The other is that the scissor frame is in a fully folded state or a low position when the failure occurs. At this time, the part of the outer side wall of the inner rod corresponding to the connection of the rotary link is in close contact with the inner side wall of the outer rod, and this part is blocked, so that the rotary link cannot be removed, and the electric push rod device cannot be removed. When the above-mentioned second failure occurs, as long as the scissor frame can be further expanded, the part of the inner rod connected to the rotary link is exposed. However, since the electric push rod device is stuck, the electric push rod device cannot be further extended, and the scissor frame cannot be further expanded. The current method is to first disassemble the scissor frame itself until the part of the inner rod corresponding to the connection of the rotary link is exposed, and then remove the electric push rod device. This method is very cumbersome, has a large workload, and greatly prolongs the repair time. Moreover, after the electric push rod device is repaired, not only the electric push rod device needs to be installed, but also the disassembled scissor frame needs to be reinstalled, which affects the structural precision of the scissor frame itself. SUMMARY

[0005] The present application improves the above-mentioned prior art, and the technical problem to be solved by the present application is to provide a scissor-type aerial work platform with an electric push rod convenient to maintain, which comprises a scissor frame and an electric push rod device. The electric push rod device comprises a piston rod and a rod head. The piston rod drives the scissor frame to rise and fall by extension and retraction. The rod head is rotationally connected to the scissor frame, and the rod head is detachably fixed to the upper end of the piston rod.

[0006] As a preferred embodiment of the present application, the rod head and the piston rod are inserted and matched along the axial direction of the piston rod.

[0007] As a preferred embodiment of the present application, a locking assembly is further included. The locking assembly can simultaneously act on the piston rod and the rod head and limit the relative movement between the two along the axial direction of the piston rod.

[0008] As a preferred embodiment of the present application, the upper end portion of the piston rod is an annular connecting portion with a hollow inner cavity and a port at the end; the rod head comprises a stepped connecting seat, which comprises a limiting column and a supporting column arranged in the axial direction and integrally formed, the limiting column and the supporting column are coaxial and the diameter of the supporting column is larger than that of the limiting column, an annular supporting surface surrounding the limiting column is formed on the supporting column, the limiting column extends into the hollow inner cavity and is inserted into the annular connecting portion, and the annular end surface of the annular connecting portion abuts against the annular supporting surface.

[0009] As a preferred embodiment of the present application, the locking assembly comprises a pin shaft penetrating the annular connecting portion and the limiting column in the radial direction of the piston rod, the annular connecting portion has a first locking hole for the pin shaft to pass through, and the limiting column has a second locking hole for the pin shaft to pass through.

[0010] As a preferred embodiment of the present application, the second locking hole is a round hole clamping the pin shaft, and the first locking hole is a waist-shaped hole with a long straight section in the middle extending in the circumferential direction of the annular connecting portion.

[0011] As a preferred embodiment of the present application, the rod head comprises a sleeve seat, which comprises a supporting base and an annular sleeve connecting portion, the annular sleeve connecting portion is fixed on the supporting base and surrounds a sleeve slot, the upper end of the piston rod extends into the sleeve slot and is inserted into the annular sleeve connecting portion, and the end surface of the piston rod abuts against the supporting base.

[0012] As a preferred embodiment of the present application, a first arc-shaped groove is formed on the inner wall of the annular sleeve connecting portion in the circumferential direction, a second arc-shaped groove is formed on the outer wall of the piston rod in the circumferential direction, the first arc-shaped groove and the second arc-shaped groove correspond to each other and form a circular sliding groove, and a third locking hole penetrating the inner and outer walls in the radial direction and pointing to the first arc-shaped groove is formed on the annular sleeve connecting portion; the locking assembly comprises a plurality of balls arranged in the circular sliding groove and a first plug blocking the third locking hole, the size of the balls matches the cross-sectional size of the circular sliding groove and the balls can roll along the circular sliding groove, and the balls can enter the circular sliding groove through the third locking hole.

[0013] As a preferred embodiment of the present application, an exhaust hole penetrating the inner and outer walls in the radial direction and pointing to the first arc-shaped groove is further formed on the annular sleeve connecting portion, and a second plug is arranged in the exhaust hole.

[0014] A maintenance method of the scissors-type aerial work platform with the electric push rod convenient to maintain, comprising the following steps:

[0015] S01: releasing the fixed relationship between the rod head and the piston rod by disassembly;

[0016] S02: The upper end of the scissors frame is lifted up, the scissors frame is unfolded and elongated, and the rod head moves up with the scissors frame and is separated from the piston rod;

[0017] S03: When the part of the inner rod of the scissors frame connected with the electric push rod device is no longer blocked by the outer rod and exposed, the lifting of the scissors frame is stopped;

[0018] S04: The part of the electric push rod device connected with the scissors frame is disassembled, and the connection between the lower end of the electric push rod device and the scissors frame is released;

[0019] S05: The electric push rod device is taken out from the scissors frame as a whole;

[0020] S06: The electric push rod device is repaired or directly replaced.

[0021] Beneficial effects:

[0022] Only by releasing the fixed connection between the rod head and the piston rod, the electric push rod device can be released from the restriction of the scissors frame, the upper end of the scissors frame is lifted up by external force, the scissors frame is elongated and unfolded, and the rod head in the electric push rod device rises with the rotating shaft and is separated from the piston rod. On the one hand, the rod head is separated from the piston rod, and on the other hand, the part of the inner rod of the scissors frame corresponding to the rotating shaft is exposed and can be directly disassembled. Overall, the operation is simple and fast, reduces the workload of maintenance personnel, saves maintenance time, and improves maintenance efficiency. Moreover, the scissors frame does not need to be disassembled, so that the structural precision of the scissors frame itself is not affected, and the position precision of the operation platform can be ensured after maintenance, so that the use effect is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the electric push rod device;

[0024] Figure 2 is a schematic diagram of the electric push rod device installed in the scissors frame;

[0025] Figure 3 is a schematic diagram of the first embodiment of the connection between the rod head and the piston rod;

[0026] Figure 4 is a sectional view of Figure 3 ;

[0027] Figure 5 is a schematic diagram of the rod head and the piston rod after being inserted and matched in Figure 3 ;

[0028] Figure 6 is a schematic diagram of the pin shaft fastening the rod head and the piston rod;

[0029] Figure 7 Schematic diagram of the second embodiment of the connection between the rod head and the piston rod;

[0030] Figure 8 Schematic diagram of the circular sliding groove;

[0031] Figure 9 Schematic diagram of the sleeve seat;

[0032] Figure 10 Schematic diagram of the second arc-shaped groove;

[0033] In the figure: 1, scissor frame, 11, inner rod, 12, outer rod, 2, electric push rod device, 21, piston rod, 22, rod head, 221, sleeve, 3, annular connecting part, 31, hollow inner cavity, 32, annular end face, 4, stepped connecting seat, 41, limiting column, 42, supporting column, 421, annular supporting surface, 51, first locking hole, 52, second locking hole, 53, pin shaft, 6, sleeve seat, 61, supporting base, 62, annular sleeve part, 63, sleeve groove, 71, first arc-shaped groove, 72, second arc-shaped groove, 73, third locking hole, 74, circular sliding groove, 75, ball, 76, first plug, 77, exhaust hole, 78, second plug. DETAILED DESCRIPTION

[0034] The following specific embodiments are only an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

[0035] The application discloses a scissors-type aerial work platform with a convenient-to-maintain electric push rod, which comprises a scissors frame 1 and an electric push rod device 2. The electric push rod device 2 comprises a piston rod 21 and a rod head 22. The piston rod 21 drives the scissors frame 1 to ascend and descend through extension and retraction. The rod head 22 is rotationally connected with the scissors frame 1. The rod head 22 is detachably fixed to the upper end of the piston rod 21. The scissors frame 1 is common in the prior art, that is, the scissors frame 1 is provided with two parallel scissors. A rotating shaft is horizontally arranged between the two scissors. The upper and lower ends of the electric push rod device 2 are rotationally connected with different rotating shafts. The upper end is rotationally connected with the rotating shaft through the rod head 22. Each side of the scissors is composed of an inner rod 11 and an outer rod 12 to form a scissors-like structure. The inner rod 11 is closer to the other side of the scissors, and the outer rod 12 is farther away from the other side of the scissors. The rotating shaft is connected with the inner rods 11 on the two sides, so that the rotating shaft does not interfere with the outer rod 12. Generally, the rotating shaft penetrates through the inner rod 11. The end of the rotating shaft is exposed on the outer side wall of the inner rod 11 towards the outer rod 12 on the same side. When the electric push rod device 2 is disassembled, the connecting structure needs to be removed from the position. Then, the rotating shaft is pulled out of the scissors frame 1, so that the connecting relationship between the electric push rod device 2 and the scissors frame 1 is released. Therefore, when the electric push rod device 2 is disassembled, the part of the inner rod 11 corresponding to the connecting position of the rotating shaft must not be blocked by the outer rod 12, and the part must be exposed to be disassembled. If the electric push rod device 2 is stuck when the scissors frame 1 is in a fully folded state or a low-position unfolded state with a short lifting distance, and the part of the inner rod 11 corresponding to the connecting position of the rotating shaft on the two sides of the scissors is blocked by the outer rod 12, the rotating shaft cannot be directly disassembled, and the electric push rod device 2 cannot be disassembled. When the electric push rod device 2 is stuck, the scissors frame 1 is limited, and the scissors frame 1 cannot be unfolded by external force, so that the disassembling position of the rotating shaft cannot be exposed.The rod head 22 and the piston rod 21 of the electric push rod device 2 in the embodiment are detachably fixedly connected, when the above failure occurs, only need to remove the fixed connection between the rod head 22 and the piston rod 21, so that the electric push rod device 2 loses the restriction on the scissors frame 1, uses external force to hang the upper end of the scissors frame 1 upward, makes the scissors frame 1 elongate and unfold, the rod head 22 in the electric push rod device 2 rises along with the rotating shaft and separates from the piston rod 21; on the one hand, the rod head 22 is separated from the piston rod 21, and on the other hand, the part of the inner rod 11 of the scissors frame 1 corresponding to the rotating shaft is exposed by removing the shielding of the outer rod 12, the external force for hanging the scissors frame 1 keeps it in a static state, so that the rotating shaft connected to the lower end of the electric push rod device 2 can be disassembled, so that the upper and lower ends of the electric push rod device 2 are separated from the scissors frame 1, the electric push rod device 2 can be taken down for maintenance or directly replaced; overall, the operation is simple and fast, reduces the workload of maintenance personnel, saves maintenance time, and improves maintenance efficiency; moreover, the scissors frame 1 does not need to be disassembled, so that the structural precision of the scissors frame 1 is not affected, and the position precision of the operation platform can be ensured after maintenance, so that the use effect is not affected. In actual implementation, the lifting force is preferably obtained by using a crane for lifting.

[0036] When the fixed connection between the rod head 22 and the piston rod 21 is removed, the scissors frame 1 has not been lifted, and the fixed connection between the rod head 22 and the piston rod 21 is only removed, and the two are actually matched together, until the scissors frame 1 is lifted, the rod head 22 is driven to separate from the piston rod 21, so that the rod head 22 and the piston rod 21 in the embodiment are inserted and matched along the axial direction of the piston rod 21, so that when the scissors frame 1 is lifted, the rod head 22 can be driven upward and separated from the piston rod 21 along the axial direction, avoiding the situation that the rod head 22 is stuck. When they are fixedly connected, the relative movement between the rod head 22 and the piston rod 21 along the axial direction is limited, and in the embodiment, the rod head 22 and the piston rod 21 are locked by the locking assembly, and the locking assembly can act on the piston rod 21 and the rod head 22 and limit the relative movement between the two along the axial direction of the piston rod 21.

[0037] The selection of the locking assembly needs to be adapted to the specific cooperation structure between the rod head 22 and the piston rod 21. In a first embodiment, the upper end portion of the piston rod 21 is an annular connecting portion 3 having a hollow inner cavity 31 and an opening at the end portion; the rod head 22 includes a stepped connecting seat 4, which includes a limiting column 41 and a supporting column 42 arranged in the axial direction and integrally formed, the limiting column 41 and the supporting column 42 are coaxial, and the diameter of the supporting column 42 is greater than that of the limiting column 41, the supporting column 42 forms an annular supporting surface 421 around the limiting column 41, the limiting column 41 extends into the hollow inner cavity 31 and is inserted and cooperated with the annular connecting portion 3, and the annular end surface 32 of the annular connecting portion 3 abuts against the annular supporting surface 421. In this embodiment, the annular connecting portion 3 is annular and has a circular inner wall, the limiting column 41 is also cylindrical and has a circular outer wall, and the outer wall of the limiting column 41 abuts against the inner wall of the annular connecting portion 3, thereby improving the tightness of the inserted cooperation, improving the connection firmness between the rod head 22 and the piston rod 21, and preventing external water and dust from entering the hollow inner cavity 31 of the piston rod 21; further, a sealing ring is preferably arranged on the outer wall of the limiting column 41, thereby improving the waterproof and dustproof effects. When the scissors-type aerial work platform is in normal use, two situations of lifting and lowering are considered, in which the lifting needs to overcome the gravity of the working platform, the load is large, and the ability of the piston rod 21 to support the supporting ring of the supporting column 42 needs to be ensured, the annular end surface 32 of the piston rod 21 abuts against the annular end surface 32 of the supporting column 42 in this embodiment, the piston rod 21 and the rod head 22 are both rigid structures, the piston rod 21 directly pushes against the supporting column 42 in the rod head 22 through its own structure, the structural strength can be ensured, and the load bearing capacity can also be ensured. The rod head 22 further includes a component rotationally connected with the rotating shaft, which is a sleeve 221 sleeved on the rotating shaft in this embodiment, and the sleeve 221 is fixedly integrated with the stepped connecting seat 4.

[0038] Corresponding to the first embodiment of the rod head 22 and the piston rod 21 described above, the locking device preferably comprises a pin shaft 53 which is simultaneously threaded in the radial direction of the piston rod 21 and in the annular connecting portion 3 and the limiting column 41, the annular connecting portion 3 has a first locking hole 51 for the pin shaft 53 to pass through, the limiting column 41 has a second locking hole 52 for the pin shaft 53 to pass through, the pin shaft 53 limits the relative axial movement between the limiting column 41 and the annular connecting portion 3, and fastens the limiting column 41 and the annular connecting portion 3 together. When the scissors aerial work platform is normally descending, the electric push rod device 2 pulls down the scissors frame 1, the direction of force and the direction of gravity of the working platform are consistent, both are downward, so the requirement for the load bearing capacity of the electric push rod is not high at this time, only the connection strength between the piston rod 21 and the rod head 22 needs to be ensured to overcome the tendency of mutual moving away between them. It depends on the fastening degree of the plug-in cooperation between the limiting column 41 and the annular connecting portion 3 and the limiting action of the pin shaft 53, mainly depending on the limiting action of the pin shaft 53, the structural strength of the pin shaft 53 is sufficient to ensure the fixed connection of the limiting column 41 and the annular connecting portion 3. In summary, even if the rod head 22 and the piston rod 21 in this embodiment are detachably fixedly connected, the presence of the locking assembly still meets the strength requirement of the normal use of the electric push rod device 2. The pin shaft 53 is threaded in the first locking hole 51 and the second locking hole 52, and the end thereof is fixed by a split pin or screwed.

[0039] Corresponding to the design of the locking device in the first embodiment described above, further improvement is preferred, and the second locking hole 52 is a round hole that clamps the pin shaft 53, which improves the fastening effect of the pin shaft 53 on the rod head 22 and the piston rod 21. The first locking hole 51 is a waist-shaped hole with a long straight section extending in the circumferential direction of the annular connecting part 3, so that when the pin shaft 53 is inserted into the rod head 22 and the piston rod 21, the rod head 22 can rotate relative to the piston rod 21 around the central axis of the limiting column 41; on the one hand, when installing the rod head 22 on the piston rod 21, only the second locking hole 52 needs to be within the range of the first locking hole 51, so that the pin shaft 53 can be inserted, reducing the installation difficulty and improving the installation efficiency; on the other hand, when the electric push rod device 2 twists relative to the scissor frame 1 during normal operation, the rod head 22 can rotate relative to the piston rod 21, which plays a buffering role and avoids the situation of force being blocked between the electric push rod device 2 and the scissor frame 1. In addition, since the rod head 22 and the piston rod 21 are detachably connected in this embodiment, compared with the structure in which the two are integrally fixed in the prior art, the detachable connection has relatively weak strength, and this part is a weak link of the entire electric push rod device 2. If the rod head 22 cannot rotate relative to the piston rod 21, once the above-mentioned situation of force being blocked between the electric push rod device 2 and the scissor frame 1 occurs, the above-mentioned weak connection part may be damaged due to the inability to withstand the pressure, resulting in damage to the locking assembly. However, the rotation of the rod head 22 relative to the piston rod 21 can play a buffering role and protect the locking assembly.

[0040] The second embodiment of the locking assembly and the specific matching structure between the rod head 22 and the piston rod 21 are selected. The rod head 22 includes a sleeve seat 6, the sleeve seat 6 includes a support base 61 and an annular sleeve part 62, the annular sleeve part 62 is fixed on the support base 61 and surrounds a sleeve groove 63, the upper end of the piston rod 21 extends into the sleeve groove 63 and is inserted and matched with the annular sleeve part 62, and the end face of the piston rod 21 abuts against the support base 61. The end of the piston rod 21 directly abuts against the support base 61 of the sleeve part, which has high structural strength and can meet the demand of bearing large load during lifting operation of the electric push rod device 2; the end face of the piston rod 21 does not need to be opened and can abut against the support base 61 with the entire end face, of course, if the upper end of the piston rod 21 is hollow itself, the annular upper end face can also abut against the support base 61.

[0041] Corresponding to the second embodiment of the head 22 and the piston rod 21, a first arc-shaped groove 71 is formed on the inner wall of the annular sleeve joint 62 in the circumferential direction, a second arc-shaped groove 72 is formed on the outer wall of the piston rod 21 in the circumferential direction, the first arc-shaped groove 71 and the second arc-shaped groove 72 correspond to each other and form a circular sliding groove 74, and a third locking hole 73 is formed on the annular sleeve joint 62 and penetrates the inner and outer walls in the radial direction and points to the first arc-shaped groove 71; the locking assembly includes a plurality of balls 75 arranged in the circular sliding groove 74 and a first plug 76 blocking the third locking hole 73, the size of the ball 75 matches the cross-sectional size of the circular sliding groove 74 and can roll along the circular sliding groove 74, and the ball 75 can enter the circular sliding groove 74 through the third locking hole 73. The ball 75 is simultaneously embedded in the first arc-shaped groove 71 and the second arc-shaped groove 72, limiting the relative movement of the head 22 and the piston rod 21 in the axial direction, the first plug 76 is fixed in the third locking hole 73 for blocking, and the ball 75 at this position is pressed at the same time, improving the connection strength between the head 22 and the piston rod 21; the strength of the ball 75 itself is relatively high, and the circular sliding groove 74 is usually filled with balls 75, so that the ball 75 can meet the strength requirement when the electric push rod device 2 drives the scissors frame 1 to lower the work platform, so as to overcome the tendency of the head 22 and the piston rod 21 to separate. When disassembling due to failure, the first plug 76 is removed, then the balls 75 in the circular sliding groove 74 are withdrawn through the third locking hole 73, and finally the head 22 is pulled out of the piston rod 21; during installation, the head 22 is first inserted into the piston rod 21 through the sleeve joint seat 6, then the balls 75 are put into the circular sliding groove 74 through the third locking hole 73, and finally the first plug 76 is installed to block the third locking hole 73.

[0042] Due to the cooperation between the ball 75 and the circular sliding groove 74, the ball 75 and the circular sliding groove 74 are relatively close, and when the ball 75 is put into the circular sliding groove 74, the air in the circular sliding groove 74 cannot be discharged to form a relatively high air pressure, which hinders the ball 75 from being put in; in addition, during disassembly, it is difficult to apply external force to the ball 75 in the circular sliding groove 74 from the outside to withdraw it, and the disassembly efficiency is low. Therefore, the embodiment preferably further comprises an exhaust hole 77 formed on the annular sleeve joint 62 and penetrating the inner and outer walls in the radial direction and pointing to the first arc-shaped groove 71, and a second plug 78 is arranged in the exhaust hole 77; when the ball 75 is put in, the circular sliding groove 74 is exhausted through the exhaust hole 77, so as to avoid the formation of high air pressure in the circular sliding groove 74 and hinder the ball 75 from being put in, and at the same time, during disassembly, a tool can be used to extend into the circular sliding groove 74 through the exhaust hole 77 to push the ball 75 towards the third locking hole 73, thereby improving the disassembly efficiency.

[0043] The maintenance method of the scissors-type aerial work platform with the electric push rod convenient to maintain comprises the following steps:

[0044] S01: release the fixed relationship between the rod head 22 and the piston rod 21 by disassembly;

[0045] S02: use hoisting equipment to hoist the upper end of the scissor frame 1 upwards, so that the scissor frame 1 is unfolded and elongated, and the rod head 22 moves upwards along with the scissor frame 1, and the rod head 22 is separated from the piston rod 21;

[0046] S03: when the part of the inner rod 11 of the scissor frame 1 connected with the electric push rod device 2 is no longer blocked by the outer rod 12 and exposed, stop hoisting the scissor frame 1;

[0047] S04: disassemble the rotating connection part of the electric push rod device 2 and the scissor frame 1, and release the connection relationship between the lower end of the electric push rod device 2 and the scissor frame 1;

[0048] S05: take out the electric push rod device 2 from the scissor frame 1 as a whole;

[0049] S06: repair or directly replace the electric push rod device 2;

[0050] S07: put the normal electric push rod device 2 into the scissor frame 1 and rotate the lower end of the electric push rod device 2 with the scissor frame 1;

[0051] S08: use hoisting equipment to drive the scissor frame 1 to fall and fold until the rod head 22 approaches the upper end of the piston rod 21;

[0052] S09: install the rod head 22 to the upper end of the piston rod 21.

[0053] The maintenance method is mainly aimed at the case that the scissors frame 1 is in the fully collapsed state or the very short distance micro-expansion state when the electric push rod device 2 fails, at this time, the part corresponding to the connection of the rotary connecting rod on the outer side wall of the inner rod 11 is in close contact with the inner side wall of the outer rod 12, which is blocked and cannot be disassembled, so the electric push rod device 2 cannot be disassembled. When disassembling, only two preparations of disassembling the rod head 22 and the piston rod 21 and lifting the scissors frame 1 to make it expand and lengthen are needed, so that the part of the inner rod 11 connected with the rotating shaft on the scissors frame 1 is exposed, and then the electric push rod device 2 can be directly disassembled, and the preparation work is very simple and fast; and in the preparation work, the rod head 22 is separated from the piston rod 21, so that the connection between the upper end of the electric push rod device 2 and the scissors frame 1 is released, so that only the lower end of the electric push rod device 2 needs to be disassembled in the follow-up, directly reducing the work amount of disassembling half of the electric push rod device 2 and the scissors frame 1, greatly reducing the work amount of the maintenance personnel and improving the maintenance efficiency. Compared with the maintenance method of disassembling the scissors frame 1 first in the current industry, the maintenance method of the present application is not only simple, fast and small in work amount, but also avoids the error of the structure precision of the scissors frame 1 after disassembly, so as to ensure that the structure precision of the scissors frame 1 is not affected after the disassembly of the electric push rod device 2, and the running precision of the aerial work platform is not affected.

[0054] After the lower end of the electric push rod device 2 is disassembled from the scissors frame 1, the electric push rod device 2 is disconnected from the scissors frame 1, and the electric push rod device 2 can be taken out from the scissors frame 1 for maintenance or direct replacement. After the electric push rod device 2 is repaired, it needs to be installed back to the scissors frame 1, and the subsequent steps include the following: S07: placing the normal electric push rod device 2 into the scissors frame 1 and rotatingly connecting the lower end of the electric push rod device 2 with the scissors frame 1; S08: using hoisting equipment to drive the scissors frame 1 to fall and collapse until the rod head 22 approaches the upper end of the piston rod 21; S09: installing the rod head 22 to the upper end of the piston rod 21.

[0055] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A scissors aerial work platform facilitating maintenance of an electric push rod, characterized in that, The utility model relates to a shearing fork (1) and an electric push rod device (2), the electric push rod device (2) includes piston rod (21) and rod head (22), the piston rod (21) is driven the shearing fork (1) to go up and down through telescoping, the rod head (22) is rotatably connected with the shearing fork (1), and the rod head (22) is detachably fixed on the upper end of the piston rod (21); The rod head (22) and the piston rod (21) are inserted and matched along the axial direction of the piston rod (21); Further comprising a locking assembly capable of simultaneously acting on the piston rod (21) and the rod head (22) and limiting the relative movement therebetween along the axial direction of the piston rod (21); The upper end of the piston rod (21) is an annular connecting part (3) with a hollow inner cavity (31) and a port at the end thereof; the rod head (22) comprises a stepped connecting seat (4) comprising a limiting column (41) and a supporting column (42) arranged along the axial direction and integrally formed, the limiting column (41) and the supporting column (42) are coaxial, and the diameter of the supporting column (42) is greater than that of the limiting column (41), the supporting column (42) forms an annular supporting surface (421) surrounding the limiting column (41), the limiting column (41) extends into the hollow inner cavity (31) and is inserted and matched with the annular connecting part (3), and the annular end face (32) of the annular connecting part (3) abuts against the annular supporting surface (421); The locking assembly comprises a pin shaft (53) simultaneously penetrating the annular connecting part (3) and the limiting column (41) along the radial direction of the piston rod (21), the annular connecting part (3) has a first locking hole (51) for the pin shaft (53) to penetrate, and the limiting column (41) has a second locking hole (52) for the pin shaft (53) to penetrate; The second locking hole (52) is a round hole clamping the pin shaft (53), and the first locking hole (51) is a waist-shaped hole with a long straight section in the middle extending along the circumferential direction of the annular connecting part (3); The rod head (22) comprises a sleeve connecting seat (6) comprising a supporting base (61) and an annular sleeve connecting part (62), the annular sleeve connecting part (62) is fixed on the supporting base (61) and surrounds a sleeve connecting groove (63), the upper end of the piston rod (21) extends into the sleeve connecting groove (63) and is inserted and matched with the annular sleeve connecting part (62), and the end face of the piston rod (21) abuts against the supporting base (61). A first arc-shaped slot (71) is formed on the inner wall of the annular sleeve (62) in a circumferential direction, a second arc-shaped slot (72) is formed on the outer wall of the piston rod (21) in a circumferential direction, the first arc-shaped slot (71) and the second arc-shaped slot (72) correspond to each other and form a circular sliding slot (74), a third locking hole (73) is formed on the annular sleeve (62) and penetrates the inner and outer walls in a radial direction and points to the first arc-shaped slot (71); the locking assembly comprises a plurality of rolling balls (75) arranged in the circular sliding slot (74) and a first plug (76) sealing the third locking hole (73), the size of the rolling ball (75) matches the cross-sectional size of the circular sliding slot (74) and can roll along the circular sliding slot (74), and the rolling ball (75) can enter the circular sliding slot (74) through the third locking hole (73).

2. A scissors aerial work platform with electrically powered jibs that is easy to service according to claim 1, characterized in that, A gas exhaust hole (77) is also formed on the annular sleeve (62) and penetrates the inner and outer walls in a radial direction and points to the first arc-shaped slot (71), and a second plug (78) is arranged in the gas exhaust hole (77).

3. A method of servicing a scissors aerial work platform with electrically powered jibs as claimed in claim 1 or 2, characterized in that, The method comprises the following steps: S01: releasing the fixed relationship between the rod head (22) and the piston rod (21) by disassembling; S02: lifting the upper end of the scissors frame (1) upward, so that the scissors frame (1) is unfolded and elongated, the rod head (22) moves upward together with the scissors frame (1), and the rod head (22) is separated from the piston rod (21); S03: when the part of the inner rod of the scissors frame (1) connected with the electric push rod device (2) is no longer blocked by the outer rod and is exposed, stop lifting the scissors frame (1); S04: disassemble the rotating connection part of the electric push rod device (2) and the scissors frame (1), and release the connection relationship between the lower end of the electric push rod device (2) and the scissors frame (1); S05: take out the electric push rod device (2) from the scissors frame (1) as a whole; S06: repair or directly replace the electric push rod device (2).

Images