CN214464725U

CN214464725U - Short body type electric hydraulic tool

Info

Publication number: CN214464725U
Application number: CN202120340226.1U
Authority: CN
Inventors: 王俊; 彭亚民; 董建华
Original assignee: European Shield Technology Co ltd
Current assignee: European Shield Technology Co ltd
Priority date: 2020-12-03
Filing date: 2021-02-05
Publication date: 2021-10-22
Anticipated expiration: 2031-02-05

Abstract

The utility model provides an electronic hydraulic tool of short fuselage formula, it includes base member subassembly, pump body subassembly, oil tank, motor element, piston shaft subassembly and work head subassembly. The base body assembly comprises an oil cylinder and an assembly body connected to the oil inlet end of the oil cylinder, a motor mounting hole and a pump body assembly surface are formed in the assembly body, the axis of the motor mounting hole is intersected with the axis of the oil cylinder, and the pump body assembly surface is formed at the end of the motor mounting hole and is provided with a plurality of oil inlet holes and at least one oil return hole communicated with the oil cylinder. The pump body assembly is connected to the pump body assembly surface, and oil pumped by the pump body assembly is conveyed to the rodless cavity of the oil cylinder through the oil inlet holes. The oil tank communicates pump body subassembly and at least one oil gallery respectively. The motor assembly and the pump body assembly are arranged in the motor mounting hole oppositely and extend along one side of the base body assembly, and the output end of the motor assembly is connected to the pump body assembly. The piston shaft assembly is arranged on the oil cylinder and reciprocates under the action of oil in a rodless cavity of the oil cylinder. The working head component comprises a rack moving cutter head.

Description

Short body type electric hydraulic tool

Technical Field

The utility model relates to a hydraulic tool, and in particular to short fuselage formula electric hydraulic tool.

Background

The electric hydraulic tool is a tool for converting the rotary mechanical energy of power machinery (such as an internal combustion engine and an electric motor) into hydraulic energy and outputting the hydraulic energy, and is widely used for concrete engineering construction, breaking and dismantling construction or important tools for emergency rescue and disaster relief. The traditional electric hydraulic device is mostly split type, and comprises a hydraulic main body and a working head which are large and heavy, so that the device is inconvenient to carry and is difficult to operate in a space with a small size, and particularly, the device is used in occasions of emergency rescue and disaster relief.

To solve this problem, integral hand-held electro-hydraulic tools are currently on the market. Compared with the traditional split type electro-hydraulic device, the integrated handheld electro-hydraulic tool is greatly improved in size and weight. However, the existing integrated handheld electric hydraulic tool is mostly designed in a linear type with a long machine body, the whole length of the whole tool is very long, the occupied space is large, and the operation is very inconvenient due to the fact that the length exceeds the optimal distance of human mechanics. Furthermore, the existing integrated handheld electric hydraulic tool also has the problems that the whole cast iron machine body is heavy and inconvenient to carry, and parts are not modularized, so that the maintenance and the replacement are difficult and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome the long, bulky problem of current handheld electronic hydraulic tool fuselage of integral type, provide a short fuselage formula electronic hydraulic tool.

In order to achieve the above object, the utility model provides an electronic hydraulic tool of short fuselage formula, it includes base member subassembly, pump body subassembly, oil tank, motor element, piston shaft subassembly and working head subassembly. The base body assembly comprises an oil cylinder and an assembly body connected to the oil inlet end of the oil cylinder, a motor mounting hole and a pump body assembly surface are formed in the assembly body, the axis of the motor mounting hole is intersected with the axis of the oil cylinder, and the pump body assembly surface is formed at the end of the motor mounting hole and is provided with a plurality of oil inlet holes and at least one oil return hole communicated with the oil cylinder. The pump body assembly is connected to the pump body assembly surface, and oil pumped by the pump body assembly is conveyed to the rodless cavity of the oil cylinder through the oil inlet holes. The oil tank communicates pump body subassembly and at least one oil gallery respectively. The motor assembly and the pump body assembly are arranged in the motor mounting hole oppositely and extend along one side of the base body assembly, and the output end of the motor assembly is connected to the pump body assembly. The piston shaft assembly is arranged on the oil cylinder and reciprocates under the action of oil in a rodless cavity of the oil cylinder. The working head assembly comprises a rack connected with the oil cylinder and a moving cutter head arranged on the piston shaft assembly.

According to the utility model discloses an embodiment, the axis of the axis perpendicular to hydro-cylinder of motor mounting hole, motor element extend along the direction of perpendicular to hydro-cylinder axis.

According to the utility model discloses an embodiment still has the spacing portion of a plurality of pumps on the assembly body, and the spacing portion protrusion of a plurality of pumps just distributes along the circumference of pump body fitting surface in pump body fitting surface, and a plurality of pumps are spacing to correspond the setting with a plurality of plungers in the pump body subassembly respectively.

According to the utility model discloses an embodiment still has the oil tank connecting portion that are formed at pump body fitting surface periphery on the assembly body, and the oil tank sets up in oil tank connecting portion and cladding pump body subassembly.

According to the utility model discloses an embodiment, each inlet port all includes the first oil feed section that extends along the assembly body longitudinal section at inlet port place and the second oil feed section that is on a parallel with the hydro-cylinder axis.

According to the utility model discloses an embodiment, still have automatic pressure release oil circuit in the base member subassembly, automatic pressure release oil circuit includes first oil return way and the second oil return way that communicates each other, and first oil return way communicates in the lateral wall that has the pole chamber and follow the hydro-cylinder of hydro-cylinder and extends, and the second oil return way extends and communicates in the oil gallery along the assembly body.

According to the utility model discloses an embodiment, have the formula of triggering pressure release oil circuit in the assembly body, the rodless chamber of the one end intercommunication hydro-cylinder of formula of triggering pressure release oil circuit, the oil gallery of other end intercommunication pump body assembly face is offered the relief valve mounting hole that is used for installing the relief valve on the lateral wall of assembly body, and the inner intercommunication of relief valve mounting hole triggers formula pressure release oil circuit, and the relief valve is opened or is blocked the formula of triggering pressure release oil circuit.

According to the utility model discloses an embodiment, short fuselage formula electro-hydraulic tool still includes the handheld handle of tail end, and the upper end of the handheld handle of tail end is connected in the tip of assembly body, and the lower extreme of the handheld handle of tail end is connected in motor element.

According to the utility model discloses an embodiment, short fuselage formula electro-hydraulic tool still includes the rotary type and connects in the handheld portion of front end of hydro-cylinder, rotates the handheld portion of front end so that frame, the handheld portion of front end and motor element three support short fuselage formula electro-hydraulic tool.

According to an embodiment of the present invention, the short body type electro-hydraulic tool is any one of a cut-off machine, a punching machine, a shearing machine, a bending machine, or a riveting machine.

To sum up, the utility model provides an it intersects in the motor mounting hole of hydro-cylinder axis to have an axis on the assembly body among the short fuselage type electro-hydraulic tool, and the setting up of this motor mounting hole makes assembly back motor element extend along one side of base member subassembly, and motor element's extending direction and the axial of hydro-cylinder are crossing. This setting has greatly shortened the ascending length of electronic hydraulic tool in the hydro-cylinder axial, has greatly made things convenient for user's operation. The pump body assembly surface on the assembly body provides a space for the assembly of the pump body assembly, and the arrangement of the oil inlets and the at least one oil return hole on the pump body assembly surface not only realizes the transmission of oil from the radial direction of the oil cylinder to the axial direction of the oil cylinder, but also greatly simplifies the oil circuit design of the oil tank, the pump body assembly and the oil cylinder.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic structural view of a short-body type electro-hydraulic tool according to an embodiment of the present invention.

Fig. 2 and 1 are schematic structural views from another viewing angle.

Fig. 3 is a cross-sectional view taken along line a-a of fig. 2.

Fig. 4 is a schematic structural diagram of fig. 1 from another view angle.

Fig. 5 is a cross-sectional view taken along line B-B of fig. 4.

Fig. 5A is a cross-sectional view taken along line F-F in fig. 5.

Fig. 6 is a cross-sectional view taken along line C-C of fig. 4.

Fig. 7 is a cross-sectional view taken along line D-D of fig. 4.

Fig. 8 is a cross-sectional view taken along line E-E of fig. 4.

Fig. 9 is a schematic structural diagram of fig. 1 from another view angle.

Fig. 10 is a cross-sectional view taken along line G-G of fig. 9.

Fig. 11 is an exploded view of fig. 1.

FIG. 12 is an exploded view of the assembly of the base assembly and pump body assembly of FIG. 11.

Fig. 13 is a schematic structural view of the base assembly of fig. 1.

Fig. 14 to 16 are schematic structural views of fig. 13 from another viewing angle.

Fig. 17 is a sectional view taken along line H-H in fig. 16.

Detailed Description

As shown in fig. 1 to 12, the short-body type electro-hydraulic tool provided by the present embodiment includes a base assembly 10, a pump body assembly 20, an oil tank 30, a motor assembly 40, a piston shaft assembly 50, and a working head assembly 60. The base body assembly 10 comprises an oil cylinder 1 and an assembly body 2 connected to an oil inlet end of the oil cylinder 1, wherein the assembly body 2 is provided with a motor mounting hole 21 and a pump body assembly surface 22, the axis of the motor mounting hole 21 is intersected with the axis of the oil cylinder 1, and the pump body assembly surface 22 is formed at the end part of the motor mounting hole 21 and is provided with a plurality of oil inlet holes 221 and at least one oil return hole communicated with the oil cylinder 1 on the pump body assembly surface 22. The pump body assembly 20 is connected to the pump body assembly surface 22, and oil pumped by the pump body assembly 20 is delivered into the rodless cavity 101 of the oil cylinder 1 through the oil inlet holes 221. The oil tank 30 is communicated with the pump body assembly 20 and at least one oil return hole respectively. The motor assembly 40 is arranged in the motor mounting hole 21 opposite to the pump body assembly 20 and extends along one side of the base body assembly 10, and the output end of the motor assembly 40 is connected to the pump body assembly 20. The piston shaft assembly 50 is arranged on the oil cylinder 1 and reciprocates under the action of oil in the rodless cavity 101 of the oil cylinder. The working head assembly 60 includes a frame 601 connected to the cylinder 1 and a moving head 602 provided to the piston shaft assembly 50.

In the present embodiment, the motor in the motor assembly 40 is a brush motor. However, the present invention is not limited to this.

The present embodiment provides a short body type electric hydraulic tool in which the axis of the motor mounting hole 21 intersects with the axis of the cylinder 1, and this arrangement enables the motor assembly 40 to extend along the side of the base assembly 10, thereby shortening the dimension of the entire hydraulic tool in the axial direction of the cylinder 1 and achieving the shortening of the body. In the present embodiment, the axis of the motor mounting hole 21 is perpendicular to the axis of the cylinder 1. However, the present invention is not limited to this. In other embodiments, the intersection between the axis of the motor mounting hole and the axis of the cylinder may form an angle of less than 90 degrees.

In the present embodiment, as shown in fig. 11 and 12, the pump body assembly 20 is a four-plunger pump. However, the present invention is not limited to this. In other embodiments, the pump body assembly 20 may be a two-plunger, three-plunger, five-plunger, or other number of plunger pumps. In this embodiment, the pump assembly 20 includes a plunger carrier 201 and four plungers 202, a through hole 2011 is formed in a middle portion of the plunger carrier 201, four plunger mounting holes 2012 uniformly distributed along a circumferential side wall of the plunger carrier 201, and four sets of pump oil holes (not shown in the drawings due to a view angle) formed in an end surface of the plunger carrier 201 and communicated with the four plunger mounting holes 2012. The four plungers 202 are respectively disposed in the four plunger mounting holes 2012. The eccentric shaft 401 of the motor assembly 40 passes through the motor mounting hole 21 from bottom to top and extends into the through hole 2011, the eccentric shaft 401 drives the needle roller bearing 402 connected with the eccentric shaft to rotate, and the peripheral wall of the needle roller bearing 402 continuously extrudes the four plungers 202, so that oil is pumped out from the four groups of pump oil holes. In this embodiment, each set of pumping holes includes two pumping holes. However, the present invention is not limited to this.

As shown in fig. 12 and 13, the pump body mounting surface 22 has four oil inlet holes 221 disposed opposite to the four sets of pumping oil holes and each oil inlet hole 221 has an oval oil sump 223 at its upper end. During assembly, the oil outlet end face of the plunger carrier 201 abuts against the pump body assembly face 22 and the two are fixedly connected through eight screws. After the assembly is completed, the four groups of pump oil holes on the plunger carrier 201 are respectively in butt joint with the four oil collecting grooves 223, and oil output by each group of pump oil holes is collected by the oil collecting grooves 223 and then enters the oil inlet 221. The oil collecting groove 223 is arranged to realize the conversion from the double-pump oil hole on the pump body assembly 20 to the single oil inlet hole 221 on the assembly body 2, so that the existing plunger pump is well matched and compatible, only four oil inlet holes need to be formed on the assembly body 2, and the processing of the assembly body 2 is greatly simplified. However, the present invention is not limited to this. In other embodiments, eight (four) oil inlets may be formed in the mounting body, and each oil inlet is independently butted with one pumping hole.

In the present embodiment, as shown in fig. 11 and 12, the assembly body 2 further has four pump body limiting parts 23, the four pump body limiting parts 23 protrude from the pump body assembly surface 22 and are distributed along the circumferential direction of the pump body assembly surface 22, and the four pump body limiting parts 23 are respectively disposed corresponding to the four plungers 202. The four pump body stoppers 23 block and limit outer ends of the four plungers 202 mounted in the plunger mounting holes 2012. Meanwhile, the four pump body limiting parts 23 are arranged to realize positioning of the pump body assembly 20 and the pump body assembly surface 22 during assembly, so that the oil inlet hole in the pump body assembly surface 22 is accurately matched with the pump oil hole in the plunger carrier after assembly, oil pumped out from the pump oil hole completely enters the oil inlet hole without leakage, and the use safety of the hydraulic tool is greatly improved. However, the present invention is not limited to this.

The oil passage transfer relationship between the pump body assembly 20 and the base body assembly 10 will be described with reference to fig. 5, 5A, and 13. Describing the positional relationship of the components in fig. 8, since the pump body assembly 20 is disposed above the assembly body 2, the pump oil hole pumps the oil from top to bottom in the vertical direction into the oil collecting groove 223; and the oil inlet direction of the oil cylinder 2 is a horizontal axial direction. Therefore, the oil inlet hole 221 needs to convert oil transferred in the vertical direction into oil transferred in the cylinder axial direction. In this embodiment, as shown in fig. 5 and 5A, each oil inlet 221 is provided with a first oil inlet 2211 extending along the longitudinal section of the assembly body where the oil inlet 221 is located and a second oil inlet 2212 parallel to the axis of the cylinder, and the oil enters the oil collecting groove 223, then enters the first oil inlet 2211 along the longitudinal direction of the assembly body 2, and then is delivered into the rodless cavity 101 of the cylinder through the second oil inlet 2212. Because the middle part of assembly body 2 has motor mounting hole 21, for avoiding processing to arouse processing interference because the interval between first oil feed section 2211 and the motor mounting hole 21 is too little, set up first oil feed section 2211 and expand outward gradually when along assembly body 2 longitudinal extension and be the slope form to increase the processing space between its and the motor mounting hole 21. However, the present invention is not limited to this. In other two implementations, when the width of the assembly body is sufficient, the first oil inlet section may be a straight hole with an axis parallel to the axis of the motor mounting hole.

In the present embodiment, as shown in fig. 14, the mounting body 2 further includes a tank connecting portion 24 formed on the outer periphery of the pump mounting surface 22, and the tank 30 is provided in the tank connecting portion 24 and covers the pump module 20. However, the present invention is not limited to this. In other embodiments, the fuel tank may be mounted to the side wall of the mounting body.

In this embodiment, the base assembly 1 has an automatic pressure relief oil path 4 and a trigger pressure relief oil path 5 therein, and correspondingly, the assembly body 2 has two oil return holes, which are a second oil return hole 223 communicating with the automatic pressure relief oil path 4 and a first oil return hole 222 communicating with the trigger pressure relief oil path 5. However, the present invention is not limited to this. In other embodiments, the assembly body has only one oil return hole, and the automatic pressure relief oil path and the triggered pressure relief oil path are both communicated with the oil return hole.

In this embodiment, one end of the automatic pressure relief oil path 4 is communicated with the rod chamber 102 of the cylinder through the sidewall of the cylinder 1, and the other end extends to the second oil return hole 223 along the cross section of the second oil return hole 223 on the assembly body 2. Specifically, as shown in fig. 6 and 10, the automatic pressure relief oil path 4 includes a first oil return path 41 and a second oil return path 42 that are communicated with each other, the first oil return path 41 is communicated with the rod cavity 102 of the cylinder through the cylinder oil outlet hole 11 on the cylinder and extends along the side wall of the cylinder 1, and the second oil return path 42 extends along the assembly body 2 and is communicated with the second oil return hole 223. As shown in fig. 6, the second oil gallery 42 extends along a longitudinal section of the fitting body 2; in addition, in order to avoid interference between the second oil return channel 42 and the motor mounting hole 21 during machining, the second oil return channel 42 is arranged on the longitudinal section of the assembly body and gradually expands outwards from the pump body assembly 20 to the motor assembly 40 so as to increase the machining distance between the second oil return channel and the motor mounting hole 21, and machining difficulty is simplified. However, the present invention is not limited to this.

Further, as shown in fig. 3, fig. 7 and fig. 17, assembly has trigger type pressure release oil circuit 5 in the body 2, the one end of trigger type pressure release oil circuit 5 communicates the rodless chamber 101 of hydro-cylinder, the first oil return hole 222 of the other end intercommunication pump body mounting surface, offer the relief valve mounting hole 25 that is used for installing relief valve 6 on the lateral wall of assembly body 2, the inner intercommunication trigger type pressure release oil circuit 5 of relief valve mounting hole 25, relief valve 6 is opened or is blocked trigger type pressure release oil circuit 5. The triggered relief oil passage 5 includes an axial straight section 51, a vertical section 52, and an inclined section 53. The axial straight section 51 is communicated with the oil cylinder rodless cavity 101 and axially extends along the oil cylinder; the vertical section 52 is respectively communicated with the axial straight section 51 and the relief valve mounting hole 25; one end of the inclined section 53 is communicated with the relief valve mounting hole 25, and the other end is communicated with the first oil return hole 222. The relief valve 6 communicates or blocks the vertical section 52 and the inclined section 53. However, the present invention is not limited to this. In other embodiments, the relief valve mounting hole may also be directly connected to the bottom of the cylinder via an inclined oil passage.

In this embodiment, the pressure relief valve 6 is a manual pressure relief screw, and a user can manually rotate the pressure relief screw to realize manual trigger pressure relief. However, the present invention is not limited to this. In other embodiments, the pressure relief valve may be a pressure relief valve that performs trigger pressure relief according to the oil pressure in the trigger pressure relief oil path.

The operation of the short-body type electro-hydraulic tool according to the present embodiment will be described with reference to fig. 1 to 15.

In the oil-in state, the motor assembly 40 drives the plurality of plungers 202 in the pump body assembly 20 to reciprocate, and the plungers 202 reciprocate while pumping the oil in the oil tank 30 out of the pump oil holes. Oil enters the rodless cavity 101 of the oil cylinder through the first oil inlet section 2211 and the second oil inlet section 2212, the oil pressure in the rodless cavity 101 is increased and pushes the piston shaft assembly 50 to advance, and the moving cutter head 602 follows the push shaft 501 in the piston shaft assembly to advance and process materials on the frame 601. As shown in fig. 8, when the small piston 502 on the piston shaft assembly 50 abuts against the end K of the frame 601 extending into the oil cylinder 1, the small piston 502 retreats and opens the small piston mounting hole at the bottom of the push shaft, the rod chamber 102 and the rodless chamber 101 in the oil cylinder 1 are communicated, and the oil in the rodless chamber 101 enters the rod chamber 102 and enters the second oil return hole 223 through the first oil return channel 41 and the second oil return channel 42 in the automatic pressure relief oil path 4, and then enters the oil tank 30 for oil return. The oil pressure in the rodless chamber 101 decreases, and the push shaft 501 retreats and returns under the action of the push shaft spring.

And when the oil pressure in the oil cylinder 1 is too high or the electric hydraulic tool breaks down, the user can manually open the pressure release valve 6, the vertical section 52 and the inclined section 53 in the trigger type pressure release oil path 5 are communicated, and the oil in the rodless cavity 101 of the oil cylinder enters the first oil return hole 222 through the axial straight section 51, the vertical section 52 and the inclined section 53 and then enters the oil tank.

In the present embodiment, as shown in fig. 1, the short-body type electro-hydraulic tool further includes a tail-end handle 70 and a front-end handle 80 connected to the cylinder 1, an upper end of the tail-end handle 70 is connected to an end of the oil tank 30, and a lower end of the tail-end handle 70 is connected to the motor assembly 20. In use, the user's hands may be respectively held on the trailing-end hand grip 70 and the leading-end hand grip 80 to smoothly operate the hydraulic tool. Further, an annular groove 12 is formed in the outer wall of the oil cylinder 1, and the front-end holding portion 80 is rotatably sleeved in the annular groove 12 and can rotate 360 degrees around the oil cylinder. When the machine is placed on the ground for work, the user can rotate the front-end holding part 80 to a proper angle so that the frame 601, the front-end holding part 80 and the motor assembly 40 are distributed triangularly to support the short-body type electric hydraulic tool, the operation is very stable, the operation view is wide, and the work is convenient.

In this embodiment, the headstock 601 is connected to the cylinder 1 by a screw, and the headstock can be replaced easily and conveniently. In actual operation, a user can replace different headstock according to different application occasions, so that the electric hydraulic tool can be any one of tools such as a cutting machine, a punching machine, a shearing machine, a bending machine or a riveting machine, and the like, and the tool is convenient to use and greatly convenient to carry. Furthermore, the assembly body is made of aluminum alloy, and compared with a traditional iron casting base body, the weight of the whole machine is greatly reduced.

Although the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of other modifications and variations without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A short body electrohydraulic tool, comprising:

the base body assembly comprises an oil cylinder and an assembly body connected to the oil inlet end of the oil cylinder, wherein the assembly body is provided with a motor mounting hole and a pump body assembly surface, the axis of the motor mounting hole is intersected with the axis of the oil cylinder, the pump body assembly surface is formed at the end part of the motor mounting hole, and the pump body assembly surface is provided with a plurality of oil inlet holes and at least one oil return hole which are communicated with the oil cylinder;

the pump body assembly is connected to the pump body assembly surface, and oil pumped out by the pump body assembly is conveyed into a rodless cavity of the oil cylinder through the plurality of oil inlet holes;

the oil tank is respectively communicated with the pump body assembly and the at least one oil return hole;

the motor assembly is arranged in the motor mounting hole opposite to the pump body assembly and extends along one side of the base body assembly, and the output end of the motor assembly is connected with the pump body assembly;

the piston shaft assembly is arranged on the oil cylinder and reciprocates under the action of oil liquid in a rodless cavity of the oil cylinder;

the working head assembly comprises a rack connected with the oil cylinder and a moving cutter head arranged on the piston shaft assembly.

2. The short body electrohydraulic tool of claim 1, wherein the axis of the motor mounting bore is perpendicular to the axis of the cylinder and the motor assembly extends in a direction perpendicular to the axis of the cylinder.

3. The short body electrohydraulic tool according to claim 1, wherein the assembly body further includes a plurality of pump body limiting portions protruding from the pump body assembly surface and distributed along a circumferential direction of the pump body assembly surface, the plurality of pump body limiting portions being respectively disposed to correspond to the plurality of plungers in the pump body assembly.

4. The short body electrohydraulic tool according to claim 1, wherein the fitting body further has a tank connecting portion formed on an outer periphery of the pump body fitting surface, and the tank is provided in the tank connecting portion and covers the pump body assembly.

5. The short body electrohydraulic tool according to claim 1, wherein each of the oil feed holes includes a first oil feed portion extending along a longitudinal section of the assembly body where the oil feed hole is located and a second oil feed portion parallel to the cylinder axis.

6. The short body electrohydraulic tool of claim 1, further including an automatic pressure relief circuit within the base assembly, the automatic pressure relief circuit including a first oil return passage and a second oil return passage in communication with one another, the first oil return passage communicating with the rod cavity of the cylinder and extending along the sidewall of the cylinder, the second oil return passage extending along the mounting body and communicating with the at least one oil return hole.

7. The short-body electric hydraulic tool according to claim 1 or 6, characterized in that a trigger type pressure relief oil path is provided in the assembly body, one end of the trigger type pressure relief oil path is communicated with a rodless cavity of the oil cylinder, the other end of the trigger type pressure relief oil path is communicated with an oil return hole of the assembly surface of the pump body, a pressure relief valve mounting hole for mounting a pressure relief valve is provided on the side wall of the assembly body, the inner end of the pressure relief valve mounting hole is communicated with the trigger type pressure relief oil path, and the pressure relief valve is opened or blocked.

8. The short body electrohydraulic tool of claim 1 further including a tail end hand grip, an upper end of the tail end hand grip being connected to an end of the fuel tank and a lower end of the tail end hand grip being connected to the motor assembly.

9. The short body electrohydraulic tool of claim 1 further including a front hand portion rotatably connected to the cylinder, the front hand portion being rotatable to enable the frame, the front hand portion and the motor assembly to support the short body electrohydraulic tool.

10. The short body electrohydraulic tool of claim 1, wherein said short body electrohydraulic tool is any one of a cutter, a punch, a shear, a bender, or a riveter.