CN216461394U

CN216461394U - Stroke-adjustable electric hydraulic bending machine

Info

Publication number: CN216461394U
Application number: CN202122575375.9U
Authority: CN
Inventors: 王俊; 赵立; 孙益松; 张海江
Original assignee: Hangzhou Ode Mechanical & Electrical Co ltd
Current assignee: Hangzhou Ode Mechanical & Electrical Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-05-10
Anticipated expiration: 2031-10-25

Abstract

The utility model provides a stroke-adjustable electric hydraulic bending machine which comprises a hydraulic pump body, an oil cylinder, a return shaft assembly, a stroke adjusting piece and a bending assembly. The hydro-cylinder includes hydro-cylinder section of thick bamboo, piston rod spring and end cover, and the hydro-cylinder section of thick bamboo is connected in the hydraulic pump body, has the pressure release hole that has pole chamber and no pole chamber in the intercommunication hydro-cylinder section of thick bamboo on the piston, has the stroke control hole on the end cover. The return shaft assembly comprises a return shaft and a return shaft spring, the return shaft is arranged in a pressure relief hole in the piston through the return shaft spring so as to open or close the pressure relief hole, and the front end of the return shaft extends into a rod cavity of the oil cylinder barrel. Travel adjustment spare adjustable sets up in travel adjustment hole and stretches into the oil cylinder section of thick bamboo, and travel adjustment spare stretches into the end and the relative setting of return axle front end, and when the return axle that follows the piston and move ahead supported and lean on travel adjustment spare to stretch into the end, the return axle was spacing and open the pressure release hole. The flexure assembly includes a flexure base attached to an end cap and a push-prong attached to a piston rod.

Description

Stroke-adjustable electric hydraulic bending machine

Technical Field

The present invention relates to electrohydraulic tools, and more particularly to an adjustable stroke electrohydraulic bending machine.

Background

The bending machine is a tool for bending steel plates, steel bars and the like, and is widely applied to the building industry. At present, two types of bending machines are mainly used, one type is a traditional bending machine consisting of a gear and a bending disk surface, and the bending machine of the type has the problems of more accessories and large volume. The other is a small-sized electro-hydraulic bending machine. The handheld bending machine is small in size, so that the handheld bending machine is convenient to carry, occupies a small space during operation, and can be well suitable for field operation.

The stroke of a piston rod is controlled by a manual pressure relief valve commonly adopted by the conventional electric hydraulic bending machine, so that the bending angle of the steel bar is adjusted. Specifically, when the reinforcement is bent, the operator manually controls the relief valve by observing the degree to which the reinforcement is bent. In the operation mode, the bending degree of the steel bars is completely determined manually, the bending angle of the steel bars cannot be accurately controlled, and the uniformity of the bending angles of the steel bars after the steel bars are bent in batches is poor. In addition, manual pressure relief also brings great inconvenience to operators.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electric hydraulic bending machine with adjustable stroke, which aims to overcome at least one defect of the prior art.

In order to achieve the above object, the present invention provides a stroke-adjustable electro-hydraulic bending machine, which includes a hydraulic pump body, an oil cylinder, a return shaft assembly, a stroke adjusting member, and a bending assembly. The oil cylinder comprises an oil cylinder barrel, a piston rod spring and an end cover, the oil cylinder barrel is connected to the hydraulic pump body, a pressure relief hole which is communicated with a rod cavity and a rodless cavity in the oil cylinder barrel is formed in the piston, and a stroke adjusting hole is formed in the end cover. The return shaft assembly comprises a return shaft and a return shaft spring, the return shaft is arranged in a pressure relief hole in the piston through the return shaft spring so as to open or block the pressure relief hole, and the front end of the return shaft extends into a rod cavity of the oil cylinder barrel. Travel adjustment spare adjustable sets up in travel adjustment hole and stretches into the oil cylinder section of thick bamboo, and travel adjustment spare stretches into the end and the relative setting of return axle front end, and when the return axle that follows the piston and move ahead supported and lean on travel adjustment spare to stretch into the end, the return axle was spacing and open the pressure release hole. The flexure assembly includes a flexure base attached to an end cap and a push-prong attached to a piston rod.

According to an embodiment of the present invention, the stroke adjusting member is an adjusting screw threadedly coupled to the stroke adjusting hole, and threadedly adjusts the stroke of the piston rod.

According to one embodiment of the utility model, the outer wall of the adjusting screw or the inner wall of the stroke adjusting hole is provided with an annular groove, and the stroke-adjustable electro-hydraulic bending machine further comprises an annular sealing ring arranged in the annular groove.

According to an embodiment of the utility model, the return shaft assembly further includes a buffer member disposed at a front end of the return shaft, and the return shaft abuts against the extending end of the stroke adjusting member through the buffer member.

According to an embodiment of the present invention, the buffer member is a buffer spring, the front end of the return shaft has an annular fixing groove, and the bottom end of the buffer spring is sleeved and fixed in the annular positioning groove.

According to an embodiment of the present invention, the cylinder further includes a flat key disposed on the piston rod in an axial direction of the piston rod, the flat key restricting circumferential movement of the piston rod.

According to an embodiment of the present invention, the front end of the pushing fork head has an arc pushing groove, two sides of the arc pushing groove push the bent reinforcing bar forward, and the bent portion of the reinforcing bar is accommodated in the arc pushing groove.

According to an embodiment of the utility model, the stroke-adjustable electro-hydraulic bending machine further comprises a main handle and an auxiliary handle, the main handle is connected with the oil cylinder and the hydraulic pump assembly, a switch electrically connected with the hydraulic pump main body is arranged on the inner side of the main handle, and the auxiliary handle is connected with the bending base.

According to one embodiment of the utility model, the hydraulic pump body comprises a motor assembly, a plunger assembly and an oil bag, wherein the motor assembly drives the plunger assembly to move, and oil in the oil bag is pumped into the oil cylinder barrel.

In summary, in the stroke-adjustable electro-hydraulic bending machine provided by the utility model, the piston is provided with the return shaft assembly which moves along with the piston, and the end cover of the oil cylinder is provided with the stroke adjusting piece which is opposite to the return shaft and has adjustable extending length. When the oil cylinder barrel is used, the return shaft assembly moves forwards along with the piston and the piston rod, when the front end of the return shaft abuts against the extending end of the stroke adjusting piece, the return shaft is limited and opens the pressure relief hole, the rod cavity and the rodless cavity are communicated in the oil cylinder barrel, and the piston rod stops moving forwards. The extending end of the stroke adjusting piece realizes the accurate control of the stroke of the piston rod, namely the accurate control of the bending angle of the reinforcing steel bar. Furthermore, the length of the front end of the stroke adjusting piece extending into the oil cylinder barrel can be controlled to adjust the stroke of the piston rod, so that the steel bars can be bent at different angles, and the requirements of different operation environments are met well.

In addition, the stroke adjusting piece and the return shaft assembly also realize automatic oil return of the electric hydraulic bending machine, and after the stroke adjusting piece and the return shaft assembly are arranged, the piston rod is reset under the driving of the piston rod spring, so that the automatic reciprocating motion of the piston rod is realized, the operation of operating personnel is greatly simplified, and meanwhile, the processing efficiency of the bending machine is also greatly improved.

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 diagram of an adjustable stroke electrohydraulic bending machine according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of fig. 1 from another view angle.

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

Fig. 4 is an enlarged schematic view of fig. 3 at B.

Fig. 5 is an enlarged schematic view of C in fig. 3.

Fig. 6 is a schematic cross-sectional view of fig. 2 at another angle.

Fig. 7 is a schematic structural view of the adjusting screw of fig. 1.

Detailed Description

As shown in fig. 1 to 6, the stroke-adjustable electro-hydraulic bending machine provided in the present embodiment includes a hydraulic pump body 1, a cylinder 2, a return shaft assembly 3, a stroke adjusting member 4, and a bending assembly 5. The oil cylinder 2 comprises an oil cylinder barrel 21, a piston 22, a piston rod 23, a piston rod spring 24 and an end cover 25, the oil cylinder barrel 21 is connected to the hydraulic pump body 1, the piston 22 is provided with a pressure relief hole 221 communicated with a rod cavity 211 and a rodless cavity 212 in the oil cylinder barrel 21, and the end cover 25 is provided with a stroke adjusting hole 251. The return shaft assembly 3 comprises a return shaft 31 and a return shaft spring 32, the return shaft 31 is arranged in a pressure relief hole 221 on the piston through the return shaft spring 32 to open or close the pressure relief hole 221, and the front end of the return shaft 31 extends into a rod cavity 211 of the oil cylinder barrel. The stroke adjusting piece 4 is adjustably arranged in the stroke adjusting hole 251 and extends into the oil cylinder 21, the extending end of the stroke adjusting piece 4 is arranged opposite to the front end of the return shaft 3, and when the front end of the return shaft 31 which moves forwards along with the piston 22 abuts against the extending end of the stroke adjusting piece 4, the return shaft 31 is limited and opens the pressure relief hole 221. The flexure assembly 5 includes a flexure base 51 attached to the end cap 25 and a push prong 52 attached to the piston rod 23.

In the operation of the stroke-adjustable electro-hydraulic bending machine provided by the embodiment, the return shaft 31 follows the piston 22 and the piston rod 23 to move forward. When the front end of the return shaft 31 abuts against the extending end of the stroke adjusting member 4, the return shaft 31 is limited, the piston 22 and the piston rod 23 continue to advance, and the return shaft 31 retreats relative to the piston 22 and opens the pressure relief hole 221. The rod chamber 221 and the rodless chamber 222 in the oil cylinder 21 are communicated, oil in the rodless chamber 222 enters the rod chamber 221 and returns to an oil bag through an oil return channel on the side wall of the oil cylinder 21, the pressure in the rodless chamber 222 is reduced, and the piston rod 23 stops moving forwards. When the pressure in the rodless chamber 222 is smaller than the restoring force of the piston rod spring 24, the piston rod spring 24 drives the piston rod 23 and the piston 22 to return. Meanwhile, the return shaft spring 32 drives the return shaft 31 to return to block the pressure relief hole. In the stroke-adjustable electro-hydraulic bending machine provided by the embodiment, the stroke adjusting piece 4 and the return shaft 31 accurately control the stroke of the piston rod 23. During operation, the distance of each forward movement of the pushing fork head 52 connected to the piston rod 23 is the same, so that the bending angle of the steel bar can be accurately controlled, and the consistency of the bending angle of the processed steel bar is ensured.

Furthermore, the return shaft 31 and the stroke adjusting piece 4 further realize automatic pressure relief and reset of the piston rod 23, and an operator does not need to perform manual pressure relief and oil return, so that the operation of the operator is greatly simplified, and the operation efficiency is greatly improved.

In this embodiment, the stroke adjusting member 4 is an adjusting screw, which is threadedly connected to the stroke adjusting hole 251 and threadedly adjusts the stroke of the piston rod 23. However, the present invention is not limited thereto. In other embodiments, it is within the scope of the present invention to have a stroke adjustment member that can vary the length of the stroke adjustment member extending into the rod chamber.

Because the oil liquid will enter the rod cavity 211 through the pressure relief hole 221 after the pressure relief, in this embodiment, the inner wall of the stroke adjusting hole 251 has an annular groove, and the stroke adjustable electro-hydraulic bending machine further includes an annular sealing ring 41 disposed in the annular groove. However, the present invention does not set any limit to the position of the annular groove. In other embodiments, an annular groove may be formed in the outer wall of the adjusting screw.

In this embodiment, the retraction shaft assembly 3 further includes a buffer member 33 disposed at the front end of the retraction shaft 31, and the front end of the retraction shaft 31 abuts against the extending end of the stroke adjusting member 4 through the buffer member 33. The buffer member 33 provides a buffer space for the contact between the return shaft 31 which moves forward quickly along with the piston rod 23 and the stroke adjusting member 4, and avoids damage to the return shaft assembly 3 caused by too large instantaneous force during contact. Preferably, the buffer member 33 is a buffer spring, the front end of the return shaft 31 has an annular fixing groove, and the bottom end of the buffer spring is sleeved and fixed in the annular positioning groove. However, the present invention is not limited thereto.

In the present embodiment, as shown in fig. 6, the cylinder 2 further includes a flat key 26 disposed on the piston rod 23 along the axial direction thereof. During operation, the flat key 26 restricts circumferential movement of the piston rod 23, and the piston rod 23 rotates.

As shown in fig. 2 and 3, the front end of the pushing fork 52 has an arc pushing groove 521, and during the bending operation, two sides of the arc pushing groove 521 push the reinforcing bar 100 forward to deform the reinforcing bar 100, and the arc pushing groove 521 provides a sufficient depth of accommodating space for the bent portion of the reinforcing bar.

In this embodiment, the stroke-adjustable electro-hydraulic bending machine further includes a main handle 61 and an auxiliary handle 62, the main handle 61 is connected to the oil cylinder 2 and the hydraulic pump assembly 1, a switch 63 electrically connected to the hydraulic pump body 1 is disposed inside the main handle 1, and the auxiliary handle 62 is connected to the bending base 51. Specifically, the hydraulic pump body 1 includes a motor assembly 11, a plunger assembly 12, and an oil bag (not shown due to the view angle), the switch 63 is electrically connected to the motor assembly 11, the motor assembly 11 drives the plunger assembly 12 to move, and the oil in the oil bag is pumped into the oil cylinder 21. Preferably, the plunger assembly 12 is a four-plunger. However, the present invention is not limited thereto.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. An adjustable stroke electrohydraulic bending machine, comprising:

a hydraulic pump body;

the oil cylinder comprises an oil cylinder barrel, a piston rod spring and an end cover, wherein the oil cylinder barrel is connected to the hydraulic pump body, the piston is provided with a pressure relief hole for communicating a rod cavity and a rodless cavity in the oil cylinder barrel, and the end cover is provided with a stroke adjusting hole;

the return shaft assembly comprises a return shaft and a return shaft spring, the return shaft is arranged in a pressure relief hole in the piston through the return shaft spring so as to open or close the pressure relief hole, and the front end of the return shaft extends into a rod cavity of the oil cylinder barrel;

the stroke adjusting piece is adjustably arranged in the stroke adjusting hole and extends into the oil cylinder barrel, the extending end of the stroke adjusting piece is opposite to the front end of the return shaft, and when the return shaft moving forwards along with the piston abuts against the extending end of the stroke adjusting piece, the return shaft is limited and opens the pressure relief hole;

the bending assembly comprises a bending base connected to the end cover and a pushing fork head connected to the piston rod.

2. The stroke-adjustable electro-hydraulic bending machine according to claim 1, wherein the stroke adjustment member is an adjustment screw, the adjustment screw is threadedly coupled to the stroke adjustment hole, and the stroke of the piston rod is threadedly adjusted.

3. The stroke-adjustable electrohydraulic bending machine according to claim 1 or 2, wherein the outer wall of the adjusting screw or the inner wall of the stroke adjusting hole has an annular groove, and the stroke-adjustable electrohydraulic bending machine further includes an annular seal ring disposed in the annular groove.

4. The stroke-adjustable electrohydraulic bending machine according to claim 1, wherein said return shaft assembly further includes a buffer member disposed at a front end of the return shaft, and the return shaft abuts against an end of the stroke adjusting member through the buffer member.

5. The stroke-adjustable electro-hydraulic bending machine according to claim 4, wherein the buffer member is a buffer spring, the front end of the return shaft has an annular fixing groove, and the bottom end of the buffer spring is sleeved and fixed in the annular positioning groove.

6. The stroke-adjustable electro-hydraulic bending machine according to claim 1, wherein the cylinder further comprises a flat key disposed on the piston rod in the axial direction of the piston rod, the flat key limiting circumferential movement of the piston rod.

7. The stroke-adjustable electro-hydraulic bending machine according to claim 1, wherein the front end of the pushing fork head has an arc pushing groove, both sides of the arc pushing groove push the bent reinforcing steel bar forward, and the bent portion of the reinforcing steel bar is accommodated in the arc pushing groove.

8. The stroke-adjustable electro-hydraulic bending machine according to claim 1, further comprising a main handle connected to the cylinder and the hydraulic pump assembly and provided with a switch inside thereof, the switch being electrically connected to the hydraulic pump body, and an auxiliary handle connected to the bending base.

9. The stroke-adjustable electro-hydraulic bending machine according to claim 1, wherein the hydraulic pump body comprises a motor assembly, a plunger assembly and an oil bag, the motor assembly drives the plunger assembly to move, and oil in the oil bag is pumped out into the oil cylinder barrel.