阅读说明：本技术 一种用于弹簧大负载的液压拉伸器 (Hydraulic stretcher for spring large load ) 是由 虞军胜 周黎 李敏 冯世泽 刘士成 曾毅 谢文建 周燕 居龙 张波 赵明朝 周 于 2020-06-19 设计创作，主要内容包括：本发明公开了一种用于弹簧大负载的液压拉伸器,其包括液压缸,所述液压缸上设有正腔油口和反腔油口,所述液压缸的活塞杆内沿轴向套装有螺杆,所述螺杆的两端均延伸至活塞杆外,位于液压缸内的螺杆一端穿过液压缸后与下底板固定连接,所述下底板与液压缸之间设有弹簧。其目的是为了提供一种运行稳定、故障率低且具有减振作用的用于弹簧大负载的液压拉伸器。(The invention discloses a hydraulic stretcher for a large spring load, which comprises a hydraulic cylinder, wherein a positive cavity oil port and a negative cavity oil port are arranged on the hydraulic cylinder, a screw rod is sleeved in a piston rod of the hydraulic cylinder along the axial direction, two ends of the screw rod extend out of the piston rod, one end of the screw rod positioned in the hydraulic cylinder penetrates through the hydraulic cylinder and then is fixedly connected with a lower bottom plate, and a spring is arranged between the lower bottom plate and the hydraulic cylinder. Its purpose is in order to provide a operation stability, the fault rate is low and have the hydraulic stretching ware that is used for the spring heavy load of damping effect.)

1. A hydraulic tensioner for high spring loads, characterized by: the hydraulic cylinder is provided with a positive cavity oil port and a negative cavity oil port, a screw rod is sleeved in a piston rod of the hydraulic cylinder along the axial direction, two ends of the screw rod extend out of the piston rod, one end of the screw rod, which is positioned in the hydraulic cylinder, penetrates through the hydraulic cylinder and then is fixedly connected with a lower bottom plate, and a spring is arranged between the lower bottom plate and the hydraulic cylinder.

2. The hydraulic tensioner for high spring loads according to claim 1, characterized in that: the pneumatic cylinder includes the cylinder, the upper end of cylinder is equipped with the cylinder cap, the lower extreme of cylinder is equipped with down the cylinder cap, the piston rod passes the upper cylinder cap and extends to outside the cylinder, and the screw rod one end that is located the pneumatic cylinder passes behind the lower cylinder cap with lower plate fixed connection.

3. The hydraulic tensioner for high spring loads according to claim 2, characterized in that: the cylinder is characterized in that a cylindrical guide rod is sleeved on the screw rod in the cylinder, the guide rod is fixedly arranged on the lower cylinder cover, and the guide rod is positioned between the piston rod and the screw rod.

4. The hydraulic tensioner for high spring loads according to claim 3, characterized in that: the cylinder cover is characterized in that a flange is fixedly arranged on one side of the lower cylinder cover, which is positioned outside the cylinder barrel, an upper base plate is fixedly arranged on the flange, a screw rod between the lower cylinder cover and the lower base plate penetrates through the flange and the upper base plate, and a spring is arranged between the upper base plate and the lower base plate.

5. The hydraulic tensioner for high spring loads according to claim 4, characterized in that: the spring is set to be one, and the spring is arranged around the screw rod between the upper bottom plate and the lower bottom plate.

6. The hydraulic tensioner for high spring loads according to claim 5, characterized in that: the screw rod is provided with a fastening piece used for blocking the piston rod from extending outwards, and the fastening piece is detachably arranged on the screw rod.

7. The hydraulic tensioner for high spring loads according to claim 6, characterized in that: the fastener includes lock nut and splices tight nut, lock nut and the equal threaded connection of the tight nut of splices on the screw rod, lock nut and the mutual close arrangement of clinging of the tight nut of splices, lock nut is close to the piston rod end and arranges.

8. The hydraulic tensioner for high spring loads according to claim 7, characterized in that: and a lifting lug is fixedly arranged on the upper cylinder cover.

9. The hydraulic tensioner for high spring loads according to claim 8, characterized in that: and a guide belt is arranged on the inner cylinder wall of the guide rod.

10. The hydraulic tensioner for high spring loads according to claim 9, characterized in that: the screw rod and the piston rod are coaxially arranged.

Technical Field

The invention relates to the field of engineering machinery, in particular to a hydraulic stretcher for a spring large load.

Background

At present, a common hydraulic tensioner is mainly used for fastening and detaching bolts with high standard requirements, and is not applied to a spring load precedent. In many occasions in the field of engineering machinery, a shock absorber needs to be arranged between two equipment devices with relative motion relationship for damping. When the existing damper is used, the operation is unstable, and the failure rate is high.

Disclosure of Invention

The invention aims to provide a hydraulic stretcher for a spring large load, which has the advantages of stable operation, low failure rate and vibration reduction.

The hydraulic stretcher for the large spring load comprises a hydraulic cylinder, wherein a positive cavity oil port and a negative cavity oil port are arranged on the hydraulic cylinder, a screw rod is sleeved in a piston rod of the hydraulic cylinder along the axial direction, two ends of the screw rod extend out of the piston rod, one end of the screw rod positioned in the hydraulic cylinder penetrates through the hydraulic cylinder and then is fixedly connected with a lower bottom plate, and a spring is arranged between the lower bottom plate and the hydraulic cylinder.

The hydraulic stretcher for the large spring load comprises a cylinder barrel, wherein an upper cylinder cover is arranged at the upper end of the cylinder barrel, a lower cylinder cover is arranged at the lower end of the cylinder barrel, a piston rod penetrates through the upper cylinder cover and extends out of the cylinder barrel, and one end of a screw rod positioned in the hydraulic cylinder penetrates through the lower cylinder cover and then is fixedly connected with a lower bottom plate.

The invention relates to a hydraulic stretcher for a spring large load, wherein a cylindrical guide rod is sleeved on a screw rod in a cylinder barrel, the guide rod is fixedly arranged on a lower cylinder cover, and the guide rod is positioned between a piston rod and the screw rod.

The hydraulic tensioner for the large load of the spring is characterized in that a flange is fixedly arranged on one side of the lower cylinder cover, which is positioned outside the cylinder barrel, an upper bottom plate is fixedly arranged on the flange, a screw rod between the lower cylinder cover and the lower bottom plate penetrates through the flange and the upper bottom plate, and the spring is arranged between the upper bottom plate and the lower bottom plate.

The hydraulic tensioner for the spring large load is provided with one spring, and the spring is arranged around a screw rod between an upper base plate and a lower base plate.

The invention relates to a hydraulic tensioner for a spring with a large load, wherein a screw rod is provided with a fastening piece for blocking a piston rod from extending outwards, and the fastening piece is detachably arranged on the screw rod.

The invention relates to a hydraulic tensioner for a spring with a large load, wherein a fastening piece comprises a locking nut and a splicing nut, the locking nut and the splicing nut are both in threaded connection on a screw rod, the locking nut and the splicing nut are mutually attached and arranged tightly, and the locking nut is arranged close to the end head of a piston rod.

The hydraulic stretcher is used for spring heavy load, wherein a lifting lug is fixedly arranged on the upper cylinder cover.

The invention relates to a hydraulic stretcher for a spring large load, wherein a guide belt is arranged on the inner cylinder wall of a guide rod.

The invention is used for a spring heavy-load hydraulic stretcher, wherein the screw rod and the piston rod are coaxially arranged.

The hydraulic tensioner for spring high loads of the present invention differs from the prior art in that the present invention applies the hydraulic tensioner to the spring load, namely, a screw rod is sleeved in a piston rod of the hydraulic cylinder along the axial direction, both ends of the screw rod extend out of the piston rod, wherein one end of a screw rod positioned in the hydraulic cylinder penetrates through the hydraulic cylinder and then is fixedly connected with a lower bottom plate, a spring is arranged between the lower bottom plate and the hydraulic cylinder, when in use, the lower bottom plate and the hydraulic cylinder are respectively fixed on two equipment devices with relative motion, when relative motion occurs between the two equipment devices (i.e., vibration occurs between the two equipment devices), the hydraulic cylinder can slide back and forth along the screw, because the spring exists between the hydraulic cylinder and the lower bottom plate, the aim of vibration reduction can be achieved between the hydraulic cylinder and the lower bottom plate through the spring, namely the aim of vibration reduction can be achieved between the two equipment devices through the spring. Compared with the existing shock absorber, the hydraulic tensioner is applied to the spring load, can play a role in damping shock, runs more stably and has low failure rate.

The invention will be further explained with reference to the drawings.

Drawings

FIG. 1 is a schematic diagram of the construction of a hydraulic tensioner for high spring loads according to the present invention (with fasteners installed and the spring uncompressed);

FIG. 2 is a schematic diagram of the construction of the hydraulic tensioner for spring high loads of the present invention (with fasteners installed and the spring compressed);

fig. 3 is a schematic structural view of the hydraulic tensioner for spring heavy loads of the present invention (with the fastener removed).

Detailed Description

As shown in fig. 3, the hydraulic stretcher for the large spring load of the invention comprises a hydraulic cylinder, wherein a positive cavity oil port 15 and a negative cavity oil port 16 are arranged on the hydraulic cylinder, a screw rod 6 is sleeved in the piston rod 2 of the hydraulic cylinder along the axial direction, the screw rod 6 and the piston rod 2 are coaxially arranged, two ends of the screw rod 6 extend out of the piston rod 2, the screw rod 6 can axially slide relative to the piston rod 2, one end of the screw rod 6 positioned in the hydraulic cylinder penetrates through the hydraulic cylinder and then is fixedly connected with a lower bottom plate 13, and a spring 12 is arranged between the lower bottom plate 13 and the hydraulic cylinder.

As shown in fig. 3, the hydraulic stretcher for the large spring load of the invention comprises a cylinder barrel 1, wherein the cylinder barrel 1 is vertically arranged, an upper cylinder cover 5 is arranged at the upper end of the cylinder barrel 1, a lower cylinder cover 4 is arranged at the lower end of the cylinder barrel 1, a piston rod 2 passes through the upper cylinder cover 5 and extends out of the cylinder barrel 1, and one end of a screw rod 6 positioned in the hydraulic cylinder passes through the lower cylinder cover 4 and then is fixedly connected with a lower bottom plate 13. The piston 17 is arranged on the piston rod 2 positioned in the hydraulic cylinder. The positive chamber oil port 15 is positioned below the piston 17, and the negative chamber oil port 16 is positioned above the piston 17.

As shown in fig. 3, the upper end of the screw rod 6 extends to the outside of the end of the piston rod 2 (i.e. the upper end of the piston rod 2), and the lower end of the screw rod 6 (i.e. the end of the screw rod 6 located in the hydraulic cylinder) penetrates out from the bottom end of the piston rod 2 and then penetrates through the lower cylinder cover 4, and then is fixedly connected with the lower bottom plate 13 in a threaded connection manner.

As shown in fig. 3, the hydraulic tensioner for heavy spring load of the present invention is characterized in that a cylindrical guide rod 3 is sleeved on a screw 6 in a cylinder 1, the guide rod 3 is fixed on a lower cylinder cover 4, and the guide rod 3 is located between a piston rod 2 and the screw 6, i.e. the guide rod 3 is annularly arranged between an inner cylinder wall of the piston rod 2 and an outer circumferential wall of the screw 6. The guide rod 3 is equivalent to an inner cylinder barrel of the hydraulic stretcher and is fixedly connected with the lower cylinder cover 4 through a screw, and the inner cylinder wall of the guide rod 3 is provided with a guide belt to assist the screw rod 6 to freely move back and forth in the guide rod 3. When the piston rod 2 and the cylinder barrel 1 slide up and down relatively, the guide rod 3 moves along with the cylinder barrel 1 because the guide rod 3 is fixedly arranged on the lower cylinder cover 4, namely, the guide rod 3 and the piston rod 2 also slide up and down relatively.

As shown in fig. 3, the hydraulic tensioner for spring heavy load of the present invention, wherein a flange 9 is fixedly disposed on one side of the lower cylinder cover 4 outside the cylinder barrel 1, that is, the flange 9 is disposed on the lower end surface of the lower cylinder cover 4, an upper bottom plate 11 is fixedly disposed on the flange 9, the upper bottom plate 11 is disposed below the flange 9, and the flange 9 and the upper bottom plate 11 are fixedly connected by a mounting screw 10. The screw 6 between the lower cylinder cover 4 and the lower base plate 13 penetrates through the flange 9 and the upper base plate 11, namely, the lower end of the screw 6 penetrating out of the lower cylinder cover 4 sequentially penetrates through the flange 9 and the upper base plate 11, the screw 6, the flange 9 and the upper base plate 11 can relatively slide up and down, and the spring 12 is arranged between the upper base plate 11 and the lower base plate 13. The spring 12 is provided as one, said spring 12 being arranged around the screw 6 between the upper plate 11 and the lower plate 13.

As shown in fig. 3, the hydraulic tensioner for heavy spring load of the present invention is provided with a lifting lug 14 fixed on the upper cylinder cover 5, so as to facilitate the lifting of the hydraulic tensioner.

As shown in fig. 3, the present invention applies a hydraulic tensioner to a spring load, i.e. a screw rod 6 is axially sleeved in the piston rod 2 of the hydraulic cylinder, and both ends of the screw rod 6 extend out of the piston rod 2, wherein one end of a screw rod 6 positioned in the hydraulic cylinder penetrates through the hydraulic cylinder and then is fixedly connected with a lower bottom plate 13, a spring is arranged between the lower bottom plate 13 and the hydraulic cylinder, when in use, the lower base plate 11 and the hydraulic cylinder are respectively fixed on two equipment devices with relative motion, when relative movement occurs between the two equipment devices, i.e. when vibration occurs between the two equipment devices, the hydraulic cylinder can slide back and forth along the screw 6, because the spring 12 is arranged between the hydraulic cylinder and the lower bottom plate 13, the aim of vibration reduction can be achieved between the hydraulic cylinder and the lower bottom plate 13 through the spring 12, namely the aim of vibration reduction can be achieved between the two equipment devices through the spring 12. Compared with the existing shock absorber, the hydraulic tensioner is applied to the spring load, can play a role in damping shock, and has the advantages of more stable operation and low failure rate.

As shown in fig. 1 and 2, the screw rod 6 is provided with a fastening member for blocking the piston rod 2 from extending outward, and the fastening member is detachably provided on the screw rod 6, specifically: a fastener is detachably provided at the upper end of the screw rod 6, and the fastener is located above the piston rod 2 because the fastener located above the piston rod 2 can block the piston rod 2 from further extending when the piston rod 2 extends outward (i.e., extends upward). The fastener includes lock nut 8 and splices tight nut 7, lock nut 8 with splice the equal threaded connection of tight nut 7 on screw rod 6, lock nut 8 with splice tight nut 7 and paste closely each other and arrange, lock nut 8 is close to 2 ends of piston rod and arranges. Because lock nut 8 and the equal threaded connection of piece together nut 7 are on screw rod 6, can fix lock nut 8 and piece together nut 7 on screw rod 6 or dismantle from screw rod 6 through lock nut 8 and the relative rotation of piece together nut 7 and screw rod 6.

As shown in fig. 1 and 2, after the fastening member is fixed on the screw rod 6, when the lower base plate 13 is fixed, oil is fed through the positive cavity oil port 15, the piston rod 2 is limited to move outwards (blocked by the fastening member), so that the cylinder barrel 1 moves towards the load direction of the compression spring, the operation displacement of the cylinder barrel 1 can be detected in real time through a stay wire displacement sensor externally arranged on the hydraulic tensioner, when the displacement of the cylinder barrel 1 reaches a preset value, the positive cavity oil port 15 stops supplying oil, and the upper base plate 11 is kept fixed in position through hydraulic oil or kept in position through bolt locking; the oil is fed through the oil return port 16, the cylinder barrel 1 moves towards the direction of releasing the spring load, when the displacement of the cylinder barrel 1 reaches a preset value, the oil supply of the oil return port 16 is stopped, and the upper bottom plate 11 is restored to the original free state of the spring 12.

The spring 12 of the present invention can be compressed, released and in a free-running state, as described in detail below:

and (3) a spring compression process: as shown in fig. 1 and 2, when the lower base plate 13 is fixed, oil is fed through the positive cavity oil port 15 and returned through the negative cavity oil port 16, the outward movement of the piston rod 2 is limited, the cylinder barrel 1 moves towards the load direction of the compression spring, and the guide rod 3 also moves along with the cylinder barrel 1 towards the load direction of the compression spring. The operation displacement of the cylinder barrel 1 can be detected in real time through a stay wire displacement sensor externally arranged on the hydraulic stretcher, when the displacement of the cylinder barrel 1 reaches a preset value, the oil supply of the positive cavity oil port 15 is stopped, the movement of the compression spring 12 is stopped, and the upper bottom plate 11 is kept fixed in position through hydraulic oil or kept in position through bolt locking.

And (3) releasing the spring: as shown in fig. 1 and 2, when the lower base plate 13 is fixed, oil is fed through the reverse cavity oil port 16 and returned through the positive cavity oil port 15, and since the process of releasing the spring 12 is a negative load process, the external hydraulic oil source needs to throttle the oil return amount of the positive cavity oil port 15. When releasing the spring 12, the cylinder 1 moves in the direction of the releasing spring load, while the guide rod 3 also moves with the cylinder 1 in the direction of the releasing spring load. The operation displacement of the cylinder barrel 1 can be detected in real time through a stay wire displacement sensor externally arranged on the hydraulic stretcher, when the displacement of the cylinder barrel 1 reaches a preset value, the oil supply of the oil port 16 of the reverse cavity is stopped, and the motion of the release spring 12 is stopped.

Free vibration state: as shown in fig. 3, when the lower plate 13 is not fixed and is in a free state, if the lower plate 13 vibrates, the lock nut 8 and the split nut 7 shown in fig. 1 and 2 are removed from the screw rod 6 so that the hydraulic cylinder can also vibrate freely along with the spring load, the screw rod 6, the cylinder tube 1 and the piston rod 2 are all in a free state, and the hydraulic cylinder can vibrate freely along with the spring 12 as a whole.

The invention has the characteristics of high pressure, large bearing capacity and simple and convenient use and operation, can realize the active motion of compressing the spring load and releasing the spring load, and can also realize the driven motion of freely vibrating along with the spring load. According to the required size of the spring load force, the effective acting area of the hydraulic stretcher is designed, the hydraulic stretcher is connected with a hydraulic oil source, the output of the continuously adjustable load force and the running speed of the hydraulic stretcher is realized through the hydraulic oil source outputting hydraulic oil with continuously adjustable pressure and flow, and therefore the active movement of compressing or releasing the spring load of the hydraulic stretcher is realized. According to the requirement of the system, the fastener on the hydraulic stretcher can be removed, and the driven motion of the hydraulic cylinder along with the free vibration of the spring load can be realized.

After the invention is installed between two equipment devices with relative motion relationship (one equipment device is fixedly connected with the lower bottom plate 13, and the other equipment device is fixedly connected with the hydraulic cylinder), the invention can work under the free vibration state of spring load and the state of the spring load after being compressed and rigidified. The invention can be applied to spring load, can meet the requirement that the equipment works in two states of free vibration of the spring load and compression and rigidization of the spring load, and realizes the continuous adjustment of the speed and the load force of the compression spring load and the release spring load.

According to the invention, pressure is transmitted through hydraulic oil, the pressure and the flow of the hydraulic cylinder positive cavity oil port 15 and the hydraulic cylinder negative cavity oil port 16 are automatically regulated by adopting a moving mode that the cylinder body moves and the piston rod 2 is fixed, and the regulation of the load force and the running speed under the working conditions of compressing the spring load and releasing the spring load is realized.

According to the requirement, the design load of a single hydraulic stretcher is 70t, the working load is large, and the continuous stretching and compressing functions of the spring load can be realized: the hydraulic stretcher adopts a movement mode of moving a cylinder body and fixing a piston rod 2, adopts a design structure form that a guide rod 3 is used as an inner cylinder barrel of the stretcher, and has the characteristics of simple structure, convenience in use and operation, large bearing capacity and the like; the hydraulic stretcher is provided with a plurality of external interfaces and internal locking nuts, so that certain equipment can work in a free vibration state under spring load and in a state after the spring load is compressed and rigidized; after the hydraulic stretcher is connected with an external hydraulic oil source, the continuous adjustment of the load force and the operation speed under the working conditions of compressing the spring load and releasing the spring load can be realized.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.