Electric lift service cart

Abstract

The application discloses an electric lifting service handcart, which comprises a vehicle body and a tray assembly, the vehicle body comprises a base and a frame, the frame is arranged on the base, the tray assembly is arranged on the frame in a lifting manner, and the electric lifting service handcart further comprises a foot pedal assembly and a interlocking assembly, the foot pedal assembly comprises a pedal, the pedal is hinged to the rear side of the frame, the interlocking assembly comprises a linkage mechanism, a stop mechanism and a limiting mechanism, one end of the linkage mechanism is connected with the pedal, the other end of the linkage mechanism is connected with the stop mechanism, the stop mechanism is movably arranged in the tray assembly, the limiting mechanism is telescopically arranged in the tray assembly and connected with the stop mechanism, the pedal controls the telescopic movement of the limiting mechanism through the linkage mechanism and the stop mechanism, and the limiting mechanism locks / unlocks the circuit breaker. In the application, the circuit breaker cannot be separated from the tray assembly under the locking of the limiting mechanism, and the circuit breaker cannot be accidentally dropped, so that the safety of an operator in installing, safely maintaining and repairing the circuit breaker is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of switch cabinet auxiliary equipment, in particular to an electric lifting service trolley. BACKGROUND

[0002] In the metal armored movable switchgear, it includes three layers of structure: the upper layer is the bus and instrument room, the middle layer is the circuit breaker room, and the lower layer is the cable room. Since the weight of the circuit breaker is mostly several hundred kilograms, or even heavier, a special service trolley is needed to move the circuit breaker into or out of the circuit breaker room to facilitate the installation, safe maintenance and repair of the circuit breaker. Therefore, the service trolley is an essential accessory to ensure the operation of the circuit breaker.

[0003] Although many existing service trolleys have lifting function, making the transportation of the circuit breaker more convenient, in the existing service trolley, after the circuit breaker is moved to the tray of the trolley, the fixing of the circuit breaker is mostly realized through the locking structure of the tray. Since the locking structure of the tray is almost independently arranged on the tray and needs to be manually operated to realize the fixing of the circuit breaker by the locking structure, when the locking structure is forgotten to be operated and the service trolley is started to lift the tray, during the lifting process of the tray or when it is lifted to a certain height, since the circuit breaker on the tray is not limited, the circuit breaker is prone to accidental falling, which poses a great safety hazard to the operating personnel who install, maintain and repair the circuit breaker. It is necessary to improve it. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide an electric lifting service trolley.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] An electric lifting service trolley, comprising a trolley body and a tray assembly, the trolley body comprising a base and a frame, the frame being arranged on the base, the tray assembly being arranged on the frame in a lifting manner, for placing a circuit breaker, further comprising a foot pedal assembly and an interlocking assembly, the foot pedal assembly comprising a pedal, the pedal being hinged to the rear side of the frame, the interlocking assembly comprising a linkage mechanism, a stop mechanism and a limiting mechanism, one end of the linkage mechanism being connected to the pedal and the other end being connected to the stop mechanism, the stop mechanism being movably arranged in the tray assembly, the limiting mechanism being telescopically arranged in the tray assembly and connected to the stop mechanism, the pedal controlling the telescoping of the limiting mechanism through the linkage mechanism and the stop mechanism, so as to lock / unlock the limiting mechanism to the circuit breaker.

[0007] Preferably, the linkage mechanism comprises a first connecting rope, a transmission member and a second connecting rope, one end of the first connecting rope is connected with the pedal, the other end of the first connecting rope is connected with the transmission member, the transmission member is rotatably installed on the frame, one end of the second connecting rope is connected with the transmission member, the other end of the second connecting rope is connected with the stop mechanism.

[0008] Preferably, the transmission member comprises a transmission shaft, a first cantilever and a second cantilever, the transmission shaft is rotatably installed on the frame, the first cantilever and the second cantilever are respectively installed on the transmission shaft, the first connecting rope is connected with the first cantilever, the second connecting rope is connected with the second cantilever.

[0009] Preferably, the tray assembly comprises a base frame and a bracket, the base frame is liftably arranged on the frame, the bracket is arranged on the front side of the base frame, the stop mechanism comprises a stop rod, a limiting piece and a first spring, the stop rod is movably arranged in the bracket, one end of the stop rod is connected with the second connecting rope, the other end of the stop rod is connected with the limiting mechanism, the limiting piece is fixedly arranged on the stop rod, the first spring is sleeved on the stop rod and located between the bracket and the limiting piece.

[0010] Preferably, the bracket comprises a front cross beam and a rear cross beam, the front cross beam is provided with a first lock opening opening upward, the stop rod is movably arranged in the front cross beam and the rear cross beam, the limiting mechanism comprises a hinged seat, a swing rod and a limiting head, the hinged seat is arranged on the bottom of the front cross beam, the swing rod is rotatably connected in the hinged seat, the swing rod is connected with the stop rod and the limiting head on both sides of the hinged seat, the limiting head is located in the first lock opening and extends out of the first lock opening or hides in the first lock opening along with the action of the stop rod.

[0011] Preferably, the tray assembly further comprises a left supporting plate, a right supporting plate and a locking member, at least one of the left supporting plate and the right supporting plate is provided with the locking member and is fixed to different positions of the front cross beam and the rear cross beam through the locking member, so as to change the distance between the left supporting plate and the right supporting plate.

[0012] Preferably, the locking member comprises a locking rod, a handle and a second spring, the bottom of the left supporting plate and the right supporting plate is provided with a mounting plate, the side of the rear cross beam is provided with a long strip opening, the side of the front cross beam is provided with a plurality of second lock openings, the locking rod is movably arranged in the mounting plate, one end of the locking rod is inserted into the long strip opening, the other end of the locking rod is inserted into one of the second lock openings, the handle is arranged in the mounting plate and fixedly arranged on the locking rod, the second spring is sleeved on the locking rod and located between the mounting plate and the handle.

[0013] Preferably, the bottom of the base is provided with a set of walking wheels, the frame is in the shape of an arch, the left and right sides of the base are respectively provided with side guide wheels, and the front side of the base is provided with a front guide wheel, the side guide wheels and the front guide wheel sliding along the inner side of the frame.

[0014] Preferably, the pedal assembly further comprises a mounting seat, a connecting shaft, a swing arm, a fixing seat, an eccentric wheel, a connecting rod, a supporting leg and a third spring, the rear side of the frame is fixed to a set of the mounting seats, the connecting shaft is arranged on the mounting seat, the lower end of the swing arm is fixed to the connecting shaft, the upper end of the swing arm is connected to the pedal, the fixing seat is arranged in the mounting seat, the eccentric wheel is fixed to the side of the pedal, the upper end of the connecting rod is hinged to the eccentric wheel, and the lower end of the connecting rod is hinged to the supporting leg, the supporting leg is arranged in the fixing seat, and the third spring is sleeved on the supporting leg and located between the fixing seat and the connecting rod.

[0015] Preferably, the lifting assembly further comprises a screw rod mechanism, an upper stroke switch and a lower stroke switch, the screw rod mechanism is arranged in the frame, the tray assembly is arranged in the screw rod mechanism, the upper stroke switch is located at the upper end of the frame, and the lower stroke switch is located at the lower end of the frame.

[0016] Compared with the background art, the present application has the following advantages after the above technical scheme is adopted:

[0017] 1. In the present application, the pedal controls the extension and retraction of the limiting mechanism through the linkage mechanism and the stop mechanism, so as to lock / unlock the circuit breaker. After the circuit breaker is transferred to the tray assembly, the circuit breaker will not be separated from the tray assembly under the locking of the limiting mechanism, so as to ensure that the circuit breaker will not be accidentally dropped during the lifting of the tray assembly or when the tray assembly is lifted to a certain height, and greatly improve the safety of the operation personnel in installing, safely maintaining and repairing the circuit breaker.

[0018] 2. In the present application, at least one of the left and right supporting plates can be fixed to different positions of the front and rear cross beams through the locking member arranged thereon, so as to change the distance between the left and right supporting plates and realize the adjustment of the width of the tray, so that the service handcart can be used for carrying circuit breakers of different specifications, and greatly improve the application range of the service handcart.

[0019] 3. The tray assembly of the present application is driven to lift through the screw rod mechanism, and the side guide wheels are arranged on the left and right sides of the base of the tray assembly, and the front guide wheel is arranged on the front side of the base, so that the tray assembly is more stable and reliable during lifting and moving. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is one of the three-dimensional schematic views of the present application;

[0021] Figure 2 Fig. 2 is a perspective view of the present application;

[0022] Figure 3 Fig. 3 is a perspective view of the present application (part of structure omitted);

[0023] Figure 4 Fig. 4 is an exploded view of the present application; Figure 3

[0024] Figure 5 Fig. 5 is a structural view of the present application (one of the body);

[0025] Figure 6 Fig. 6 is a structural view of the present application (two of the body);

[0026] Figure 7 Fig. 7 is a structural view of the present application (one of the pedal assembly);

[0027] Figure 8 Fig. 8 is a structural view of the present application (two of the pedal assembly);

[0028] Figure 9 Fig. 9 is an exploded view of the present application (one of the tray assembly);

[0029] Figure 10 Fig. 10 is an exploded view of the present application (two of the tray assembly);

[0030] Figure 11 Fig. 11 is a structural view of the present application (the locking member);

[0031] Figure 12 Fig. 12 is a structural view of the present application (the tray assembly);

[0032] Figure 13 Fig. 13 is a partial structural view of the present application (the interlocking assembly);

[0033] Figure 14 Fig. 14 is a partial enlarged view of A in Fig. 13. Figure 13

[0034] BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Body 100, base 110, frame 120, walking wheel 130, handle 140;

[0036] Tray assembly 200, base frame 210, bracket 220, front cross beam 221, first locking hole 2211, second locking hole 2212, rear cross beam 222, long slot 2221, side guide wheel 230, front guide wheel 240, left supporting plate 250, right supporting plate 260, locking member 270, locking rod 271, handle 272, second spring 273, mounting plate 280;

[0037] ​​Pedal assembly 300, pedal 310, mounting seat 320, connecting shaft 330, swing arm 340, fixing seat 350, eccentric wheel 360, connecting rod 370, supporting foot 380, third spring 390;

[0038] Interlocking assembly 400, linkage mechanism 410, first connecting rope 411, transmission member 412, transmission shaft 4121, first cantilever 4122, second cantilever 4123, second connecting rope 413, stop mechanism 420, stop rod 421, limiting sheet 422, first spring 423, limiting mechanism 430, hinged seat 431, swing rod 432, limiting head 433;

[0039] Lifting assembly 500, screw mechanism 510, upstroke switch 520, downstroke switch 530. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, it should be noted that:

[0041] The terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements of the present application must have a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0042] When an element is referred to as "fixed to" or "provided with" or "provided in" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] Unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the invention can be understood according to the specific circumstances.

[0044] Example

[0045] Cooperation Figures 1 to 4As shown, the application discloses an electric lifting service handcart, which comprises a body 100, a tray assembly 200, a footboard assembly 300, an interlocking assembly 400 and a lifting assembly 500.

[0046] The body 100 comprises a base 110 and a frame 120, the frame 120 is arranged on the base 110, the frame 120 is in the shape of an arch, a group of walking wheels 130 are arranged on the bottom of the base 110, a group of handles 140 are arranged on the upper side of the rear side of the frame 120, which facilitates the movement of the service handcart.

[0047] Cooperation Figure 3 , Figure 4 , Figures 9 to 11 and Figure 13 As shown, the tray assembly 200 is arranged on the frame 120 in a lifting manner, and is used for placing circuit breakers, the tray assembly 200 comprises a base frame 210 and a bracket 220, the base frame 210 is arranged on the frame 120 in a lifting manner, a pair of side guide wheels 230 are arranged on the left and right sides of the base frame 210, a front guide wheel 240 is arranged on the front side of the base frame 210, the side guide wheels 230 and the front guide wheel 240 slide along the inner side of the frame 120, so that the tray assembly 200 is more stable and reliable when lifting and moving. The bracket 220 is arranged on the front side of the base frame 210, the bracket 220 comprises a front cross beam 221 and a rear cross beam 222, the front cross beam 221 is provided with a first lock opening 2211 opening upward.

[0048] The tray assembly 200 further comprises a left supporting plate 250, a right supporting plate 260 and a locking piece 270, at least one of the left supporting plate 250 and the right supporting plate 260 is provided with the locking piece 270, and is fixed to different positions of the front cross beam 221 and the rear cross beam 222 through the locking piece 270, so as to change the distance between the left supporting plate 250 and the right supporting plate 260.

[0049] The locking piece 270 comprises a locking rod 271, a handle 272 and a second spring 273, the bottom of the left supporting plate 250 and the right supporting plate 260 is provided with a mounting plate 280, the side of the rear cross beam 222 is provided with a long slot 2221, the side of the front cross beam 221 is provided with a plurality of second lock openings 2212, the locking rod 271 is movably arranged in the mounting plate 280, one end of the locking rod 271 is inserted into the long slot 2221, the other end of the locking rod 271 is inserted into one of the second lock openings 2212, the handle 272 is arranged in the mounting plate 280 and is fixed to the locking rod 271, and the second spring 273 is sleeved on the locking rod 271 and is located between the mounting plate 280 and the handle 272.

[0050] When the distance between the left supporting plate 250 and the right supporting plate 260 needs to be adjusted, the handle 272 is moved to disengage the locking rod 271 from the second locking hole 2212, at this time, the second spring 273 is compressed, then the left supporting plate 250 and / or the right supporting plate 260 are moved to the desired position, and the handle 272 is released, so that the locking rod 271 is inserted into another second locking hole 2212 under the restoring action of the second spring 273, at this time, the change of the distance between the left supporting plate 250 and the right supporting plate 260 is completed, the width adjustment of the supporting plate is realized, the service trolley can be used for carrying circuit breakers of different specifications, and the application range of the service trolley is greatly improved.

[0051] Cooperation Figure 3 , Figure 7 and Figure 8 As shown in Figs. 13-15, the pedal assembly 300 includes a pedal 310 hingedly connected to the rear side of the frame 120, a mounting seat 320, a connecting shaft 330, a swing arm 340, a fixing seat 350, an eccentric wheel 360, a connecting rod 370, a supporting leg 380, and a third spring 390. The rear side of the frame 120 is fixedly provided with a set of mounting seats 320, the connecting shaft 330 is arranged on the mounting seat 320, the lower end of the swing arm 340 is fixedly provided on the connecting shaft 330 and the upper end is connected to the pedal 310, the fixing seat 350 is arranged in the mounting seat 320, the eccentric wheel 360 is fixedly provided on the side of the pedal 310, the upper end of the connecting rod 370 is hingedly connected to the eccentric wheel 360 and the lower end is hingedly connected to the supporting leg 380, the supporting leg 380 is arranged in the fixing seat 350, and the third spring 390 is sleeved on the supporting leg 380 and located between the fixing seat 350 and the connecting rod 370.

[0052] When the pedal 310 is horizontal (i.e., when the pedal is not stepped on), the lowest point of the eccentric wheel 360 is located at the lowermost end, at this time, the eccentric wheel 360, the connecting rod 370, and the supporting leg 380 are located on the same vertical plane, the pedal will not move under the action of external force, and self-locking of the pedal 310 can be achieved. When the pedal 310 is forcibly folded, the pedal 310 is moved to drive the eccentric wheel 360 under the action of the third spring 390, and then the connecting rod 370 and the supporting leg 380 are folded and reset.

[0053] Cooperation Figures 2 to 4 , Figure 6 , Figures 8 to 10 , Figures 12 to 14As shown, the interlocking assembly 400 comprises a linkage mechanism 410, a stop mechanism 420 and a limiting mechanism 430, one end of the linkage mechanism 410 is connected to the pedal 310 and the other end is connected to the stop mechanism 420, the stop mechanism 420 is movably arranged in the tray assembly 200, the limiting mechanism 430 is telescopically arranged in the tray assembly 200 and connected to the stop mechanism 420, the pedal 310 controls the telescoping of the limiting mechanism 430 through the linkage mechanism 410 and the stop mechanism 420, so that the limiting mechanism 430 locks / unlocks the circuit breaker.

[0054] The linkage mechanism 410 comprises a first connecting rope 411, a transmission member 412 and a second connecting rope 413, one end of the first connecting rope 411 is connected to the pedal 310 and the other end is connected to the transmission member 412, the transmission member 412 is rotatably mounted on the frame 120, one end of the second connecting rope 413 is connected to the transmission member 412 and the other end is connected to the stop mechanism 420, in this embodiment, the first connecting rope 411 and the second connecting rope 413 are both steel wire ropes.

[0055] The transmission member 412 comprises a transmission shaft 4121, a first cantilever 4122 and a second cantilever 4123, the transmission shaft 4121 is rotatably mounted on the frame 120, the first cantilever 4122 and the second cantilever 4123 are respectively mounted on the transmission shaft 4121, the first connecting rope 411 is connected to the first cantilever 4122, and the second connecting rope 413 is connected to the second cantilever 4123.

[0056] The stop mechanism 420 comprises a stop rod 421, a limiting sheet 422 and a first spring 423, the stop rod 421 is movably arranged in the bracket 220, one end of the stop rod 421 is connected to the second connecting rope 413 and the other end is connected to the limiting mechanism 430, the limiting sheet 422 is fixedly arranged on the stop rod 421, and the first spring 423 is sleeved on the stop rod 421 and located between the bracket 220 and the limiting sheet 422.

[0057] The stop rod 421 is movably arranged in the front cross beam 221 and the rear cross beam 222, the limiting mechanism 430 comprises a hinged seat 431, a swing rod 432 and a limiting head 433, the hinged seat 431 is arranged at the bottom of the front cross beam 221, the swing rod 432 is rotatably connected in the hinged seat 431, the swing rod 432 is connected to the stop rod 421 and the limiting head 433 on both sides of the hinged seat 431, the limiting head 433 is located in the first lock hole 2211 and extends out of or hides in the first lock hole 2211 with the movement of the stop rod 421.

[0058] When the pedal 310 is operated, the first connecting rope 411 drives the transmission shaft 4121 to rotate through the first cantilever 4122, the rotation of the transmission shaft 4121 drives the second cantilever 4123 and the second connecting rope 413, the operation of the second connecting rope 413 drives the stop rod 421 to move, after the stop rod 421 is operated, it drives the swing rod 432 to rotate, the rotation of the swing rod 432 drives the limiting head 433 to move downwards until it is hidden in the first lock port 2211, so that the circuit breaker can be pushed out. When the pedal 310 is reset, the stop rod 421 is reset under the action of the first spring 423, so that the swing rod 432 drives the limiting head 433 to move upwards and extend out of the first lock port 2211.

[0059] cooperating Figure 3 , Figure 5 and Figure 6 As shown in Figs. 5, 6 and 7, the lifting assembly 500 comprises a lead screw mechanism 510, an upper stroke switch 520 and a lower stroke switch 530, the lead screw mechanism 510 is arranged in the frame 120, the tray assembly 200 is installed in the lead screw mechanism 510, the upper stroke switch 520 is located at the upper end of the frame 120, the lower stroke switch 530 is located at the lower end of the frame 120, when the tray assembly 200 is lifted to the position of the upper stroke switch 520 or the lower stroke switch 530, it reaches the upper limit position or the lower limit position.

[0060] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes 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. An electric lifting service cart, comprising a body and a pallet assembly, the body including a base and a frame, the frame being disposed on the base, and the pallet assembly being liftably disposed on the frame for holding circuit breakers, characterized in that: The foot pedal assembly includes a pedal hinged to the rear side of the frame. The interlocking assembly includes a linkage mechanism, a stop mechanism, and a limit mechanism. One end of the linkage mechanism is connected to the pedal, and the other end is connected to the stop mechanism. The stop mechanism is movably disposed in the tray assembly. The limit mechanism is telescopically disposed in the tray assembly and connected to the stop mechanism. The pedal controls the telescopic movement of the limit mechanism through the linkage mechanism and the stop mechanism, so that the limit mechanism locks / unlocks the circuit breaker. The linkage mechanism includes a first connecting rope, a transmission component, and a second connecting rope. One end of the first connecting rope is connected to the pedal, and the other end is connected to the transmission component. The transmission component is rotatably mounted on the frame. One end of the second connecting rope is connected to the transmission component, and the other end is connected to the stop mechanism. The transmission component includes a drive shaft, a first cantilever, and a second cantilever. The drive shaft is rotatably mounted on the frame. The first cantilever and the second cantilever are respectively mounted on the drive shaft. The first connecting rope is connected to the first cantilever, and the second connecting rope is connected to the second cantilever. The pallet assembly includes a base frame and a bracket. The base frame is vertically mounted on the vehicle frame, and the bracket is located at the front of the base frame. The stopping mechanism includes a stop rod, a limiting plate, and a first spring. The stop rod is movably inserted into the bracket, with one end connected to a second connecting rope and the other end connected to the limiting mechanism. The limiting plate is fixed to the stop rod, and the first spring is sleeved in the stop rod and located between the bracket and the limiting plate. The bracket includes a front crossbeam and a rear crossbeam. The front crossbeam has a first locking slot with an upward opening. The stop rod is movably inserted into the front crossbeam and the rear crossbeam. The limiting mechanism includes a hinge seat, a swing rod, and a limiting head. The hinge seat is located at the bottom of the front crossbeam. The swing rod is rotatably connected to the hinge seat. The stop rod and the limiting head are respectively connected to both sides of the swing rod at its hinge point. The limiting head is located in the first locking slot and extends out of the first locking slot or is hidden in the first locking slot as the stop rod moves. When the pedal is activated, the first connecting rope drives the drive shaft to rotate through the first cantilever. The rotation of the drive shaft drives the second cantilever and the second connecting rope. The second connecting rope drives the stop rod to move. The stop rod drives the swing rod to rotate. The swing rod drives the limit head to move downward until it is hidden in the first locking hole, allowing the circuit breaker to be pushed out. When the pedal is reset, the stop rod is reset under the action of the first spring, causing the swing rod to drive the limit head to move upward and extend out of the first locking hole.

2. The electric lifting service cart according to claim 1, characterized in that: The pallet assembly also includes a left pallet, a right pallet, and a locking element. At least one of the left and right pallets is provided with a locking element and is fixed to different positions on the front and rear crossbeams by the locking element to change the distance between the left and right pallets.

3. The electric lifting service cart according to claim 2, characterized in that: The locking mechanism includes a locking rod, a handle, and a second spring. Mounting plates are provided at the bottom of the left and right support plates. A long slot is provided on the side of the rear crossbeam, and several second locking holes are provided on the side of the front crossbeam. The locking rod is movably inserted into the mounting plate, with one end inserted into the long slot and the other end inserted into one of the second locking holes. The handle is inserted into the mounting plate and fixed to the locking rod. The second spring is sleeved in the locking rod and located between the mounting plate and the handle.

4. The electric lifting service cart according to claim 3, characterized in that: The base has a set of wheels at the bottom, the frame is arch-shaped, and there are side guide wheels on the left and right sides of the base frame, and a front guide wheel on the front side of the base frame. The side guide wheels and the front guide wheel slide along the inside of the frame.

5. The electric lifting service cart according to claim 1, characterized in that: The pedal assembly also includes a mounting base, a connecting shaft, a swing arm, a fixed base, an eccentric wheel, a connecting rod, a support foot, and a third spring. The rear side of the frame is fixed to a set of mounting bases. The connecting shaft is mounted on the mounting bases. The lower end of the swing arm is fixed to the connecting shaft, and the upper end is connected to the pedal. The fixed base is located in the mounting base. The eccentric wheel is fixed to the side of the pedal. The upper end of the connecting rod is hinged to the eccentric wheel, and the lower end is hinged to the support foot. The support foot passes through the fixed base. The third spring is sleeved on the support foot and is located between the fixed base and the connecting rod.

6. The electric lifting service cart according to claim 1, characterized in that: It also includes a lifting assembly, which includes a lead screw mechanism, an upper limit switch and a lower limit switch. The lead screw mechanism is located in the frame, and the tray assembly is installed in the lead screw mechanism. The upper limit switch is located at the upper end of the frame, and the lower limit switch is located at the lower end of the frame.

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