Novel hydraulic execution device

Abstract

The utility model discloses a novel hydraulic executing device which comprises a hydraulic cylinder, a piston is arranged in the hydraulic cylinder, the piston divides the hydraulic cylinder into an upper oil cavity and a lower oil cavity, the upper oil cavity is provided with a hydraulic source, the hydraulic source is provided with a conveying device, and the hydraulic source conveys hydraulic oil to the upper oil cavity through the conveying device; the piston is connected to a piston rod, the piston rod penetrates out of an upper sealing cover of the hydraulic cylinder, and the piston rod and the upper sealing cover are connected in a sealed mode. The piston rod is provided with an upper shaft sleeve, an elastic energy storage mechanism is arranged between the upper shaft sleeve and the upper sealing cover, the elastic energy storage mechanism is supported between the upper shaft sleeve and the upper sealing cover, and the elastic energy storage mechanism is a wave spring or a multilayer stacked curved surface ring mechanism. According to the utility model, the common radial unbalance loading and additional bending moment of the actuator are overcome through a wave spring or a multi-layer superposed curved surface ring mechanism, so that the movement precision, the comprehensive performance and the service life of the hydraulic actuator are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a novel hydraulic actuator, which is used in various mechanical structures or mechanical systems as a general-purpose driving device. BACKGROUND

[0002] The existing hydraulic actuators usually adopt a wire-wound spring structure as a reset device, but the wire-wound spring has disadvantages such as inevitable radial eccentric loading and axial bending, which will damage the device. The piston rod, as the main moving part, swings with the spring and cannot be effectively centered. The piston rod swings with the spring, which will damage the other parts in contact with the piston rod, especially the seal between the upper seal cover of the hydraulic cylinder and the piston rod, which will cause hydraulic oil leakage and even complete failure of the actuator.

[0003] A novel hydraulic actuator disclosed in the authorized announcement CN212536874U includes a housing, a hydraulic cylinder and a hydraulic source installed inside the housing, an upper seal cover arranged at the upper part of the hydraulic cylinder, the hydraulic source installed on the upper seal cover, a lower seal cover arranged at the lower part of the hydraulic cylinder, the lower seal cover installed at the bottom of the housing, a piston arranged in the hydraulic cylinder, the piston dividing the hydraulic cylinder into an upper oil chamber and a lower oil chamber, the hydraulic source connected to the upper oil chamber of the hydraulic cylinder through a first channel and a second channel, the hydraulic source connected to the lower oil chamber of the hydraulic cylinder through a third channel, the hydraulic source delivering hydraulic oil to the upper oil chamber through the first channel by an oil pump, the second channel controlled to be connected or closed by an electromagnetic valve, the piston connected to a piston rod, the upper end of the piston rod penetrating out of the upper seal cover and the lower end penetrating out of the lower seal cover, the piston rod sealedly connected to the upper seal cover and the lower seal cover, a pre-storage spring arranged at the upper side of the hydraulic cylinder, the upper end of the pre-storage spring connected to the piston rod, the bottom end of the pre-storage spring arranged on the upper seal cover, and the lower end of the pre-storage spring standing freely on the lower seal cover. The pre-storage spring inevitably has disadvantages such as radial eccentric loading and axial bending, and the piston rod swings with the pre-storage spring, which will damage the seal between the piston rod and the upper seal cover. SUMMARY

[0004] The utility model solves the technical problem of eliminating the swing of the piston rod.

[0005] To achieve the above technical purposes, the technical scheme of the utility model is as follows:

[0006] The new hydraulic actuator comprises a hydraulic cylinder, a piston arranged in the hydraulic cylinder, the piston divides the hydraulic cylinder into an upper oil cavity and a lower oil cavity, the upper oil cavity is provided with a hydraulic source, the hydraulic source is provided with a conveying device, the hydraulic source conveys hydraulic oil to the upper oil cavity through the conveying device, the piston is connected to a piston rod, the piston rod penetrates through an upper sealing cover of the hydraulic cylinder, the piston rod and the upper sealing cover are in sealing connection, the piston rod is provided with an upper shaft sleeve, an elastic energy storage mechanism is arranged between the upper shaft sleeve and the upper sealing cover, the elastic energy storage mechanism is supported between the upper shaft sleeve and the upper sealing cover, and the elastic energy storage mechanism is a wave spring or a multi-layer superimposed curved ring mechanism.

[0007] The multi-layer superimposed curved ring mechanism is composed of a plurality of coaxially stacked curved rings, the curved ring comprises a metal sheet ring, the metal sheet ring has a plurality of (at least three) convex wave crests, and the plurality of wave crests are uniformly distributed along the circumference of the metal sheet ring.

[0008] Adjacent wave crests have concave wave troughs, and the wave troughs and the wave crests are alternately and uniformly arranged along the circumference of the metal sheet ring.

[0009] In order to axially constrain the multi-layer superimposed curved ring mechanism and avoid the curved ring from being offset to one side, the curved ring is arranged in a limiting sleeve, and the curved ring is elastically deformed in the limiting sleeve.

[0010] In order to circumferentially constrain the curved ring and avoid the adjacent curved rings from being offset, the pre-pressing elastic force of the multi-layer superimposed curved ring mechanism is affected, and then the multi-layer superimposed curved ring mechanism drives the piston rod to reset. For example, the wave trough bottom of the upper curved ring is supported on the wave crest top of the lower curved ring, and if the wave trough and the wave crest are offset, the pre-pressing elastic force of the multi-layer superimposed curved ring mechanism will be changed, and then the multi-layer superimposed curved ring mechanism drives the piston rod to reset. The curved ring is provided with a rotation limiting mechanism, the rotation limiting mechanism comprises a limiting groove and a limiting protrusion, the limiting protrusion is located in the limiting groove, and when the curved ring is compressed or released, the limiting groove moves along the limiting protrusion.

[0011] The limiting groove is arranged on the periphery of the curved ring, the limiting protrusion is a rib on the inner wall of the limiting sleeve, the rib and the piston rod are arranged in parallel, and the rib is located in the limiting groove. The ribs in the limiting sleeve are sequentially located in the limiting grooves of the curved rings from top to bottom, the rib and the limiting groove are loosely matched (an active gap is provided between the limiting groove and the rib, so that the curved ring can move horizontally or rotate within a limited range), and when the curved ring is compressed or released, the curved ring moves up and down along the rib and moves horizontally and rotates within a limited range, so as to circumferentially constrain the curved ring and avoid the adjacent curved rings from being offset.

[0012] The limiting mechanism is provided with a plurality of limiting mechanisms, and the plurality of limiting mechanisms are uniformly distributed along the axis of the curved ring.

[0013] The lower shaft sleeve is movably connected with the middle sleeve, and the middle sleeve is movably connected with the upper shaft sleeve, and the elastic energy storage mechanism is supported between the upper shaft sleeve and the lower shaft sleeve.

[0014] The middle sleeve has an upper middle boss and a lower middle boss, the upper shaft sleeve is provided with an upper spring boss between the upper middle boss and the lower middle boss, and the lower shaft sleeve is provided with a lower spring boss between the upper spring boss and the lower middle boss.

[0015] The piston rod is threadedly connected with an adjusting nut, and a pre-pressing adjusting seat is arranged between the adjusting nut and the middle sleeve. The distance between the upper shaft sleeve and the lower shaft sleeve can be adjusted by the adjusting nut, and the pre-pressing elastic force of the elastic energy storage mechanism is adjusted.

[0016] The piston rod is provided with a stroke shifting rod, the stroke shifting rod is connected with a rack, the rack is provided with a rack sliding groove, the piston rod drives the rack to reciprocate along the rack sliding groove, the rack is connected with a gear, and the gear is connected with the rotating shaft of the encoder. The piston rod drives the rack, the rack drives the gear to rotate, the encoder reads the movement data of the piston rod, and the precise control of the actuator is facilitated.

[0017] The wave spring or the multi-layer superimposed curved surface ring mechanism stores energy after being compressed under force, and restores the original state when the oil cylinder loses hydraulic power, and drives the piston rod to reset.

[0018] When the piston rod moves downward and drives the multi-layer superimposed curved surface ring mechanism to store energy, since each curved surface ring moves horizontally independently, only axial reset force is generated, and no radial bias force is generated, so that the common problem of the standard spring reset mechanism can be overcome, the radial bias force during movement is not disturbed, the piston rod does not swing, and the best centering and reciprocating movement precision can be obtained.

[0019] The wave spring is usually made of thin steel belt or stainless steel belt as a base body, and is composed of a plurality of periodically arranged wave peaks and wave troughs, the wave forms are uniformly distributed in the circumferential direction, the deformation amount of each wave form is the same when it is axially compressed, the radial components are offset to each other due to symmetry, and the overall radial bias force is basically not formed, so that the common problem of the standard spring can be overcome, the swing of the piston rod is eliminated, and the best centering and reciprocating movement precision of the piston rod can be obtained.

[0020] The wave spring or the multi-layer superimposed curved surface ring mechanism overcomes the radial bias and additional bending moment of the actuator, so that the movement precision, comprehensive performance and service life of the hydraulic actuator are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further explained in detail below in combination with the drawings and specific embodiments.

[0022] Figure 1 It is a structural schematic view of the new hydraulic actuator.

[0023] Figure 2 It is a structural schematic view of the upper shaft sleeve, the middle sleeve and the lower shaft sleeve.

[0024] Figure 3 It is a schematic view of the elastic energy storage mechanism.

[0025] Figure 4 It is a structural schematic view of the curved surface ring.

[0026] Figure 5 It is a structural schematic view of the limiting rod and the limiting cylinder.

[0027] Figure 6 It is a schematic view of the rack encoding mechanism. Specific embodiments

[0028] As shown in Figures 1-6 the new hydraulic actuator, comprising a shell 1, the lower end of the shell 1 is provided with a lower sealing cover 2, the upper side of the lower sealing cover 2 is provided with an upper sealing cover 3, the lower sealing cover 2 and the upper sealing cover 3 are provided with a hydraulic cylinder 4, the hydraulic cylinder 4 is provided with a piston 5, the piston 5 divides the hydraulic cylinder 4 into an upper oil cavity and a lower oil cavity, the upper sealing cover 3 is provided with a hydraulic source 41, the hydraulic source 41 is connected with the upper oil cavity of the hydraulic cylinder 4 through a first channel and a second channel, the hydraulic source 41 is connected with the lower oil cavity of the hydraulic cylinder 4 through a third channel, the hydraulic source 41 sends hydraulic oil to the upper oil cavity through the first channel by an oil pump (or other conveying device), the second channel is provided with a solenoid valve (or other control valve), the second channel is closed by the solenoid valve.

[0029] The piston 5 is connected on a piston rod 6, the piston rod 6 penetrates the upper sealing cover 3 of the hydraulic cylinder, the piston rod 6 and the upper sealing cover 3 are sealedly connected through a sealing ring, the piston rod 6 penetrates the lower sealing cover 2 of the hydraulic cylinder, the piston rod 6 and the lower sealing cover 2 are sealedly connected through a sealing ring.

[0030] The piston rod 6 is provided with an upper shaft sleeve 151, the upper shaft sleeve 151 is movably connected with a middle sleeve 153, and the middle sleeve is movably connected with a lower shaft sleeve 152. Specifically, the two ends of the middle sleeve 153 are provided with an upper middle boss 154 and a lower middle boss 155, the upper shaft sleeve 151 is provided with an upper shaft sleeve boss 156, the upper shaft sleeve boss 156 is located between the upper middle boss 154 and the lower middle boss 155, and the lower shaft sleeve 152 is provided with a lower shaft sleeve boss 157, the lower shaft sleeve boss 157 is located between the upper shaft sleeve boss 156 and the lower middle boss 155.

[0031] A wave spring is arranged between the upper shaft sleeve 151 and the lower shaft sleeve 152, the wave spring is supported between the upper shaft sleeve 151 and the lower shaft sleeve 152, and the lower shaft sleeve 152 is supported on the upper sealing cover 3.

[0032] The piston rod 6 is threadedly connected with an adjusting nut 8, a pre-press adjusting seat 81 is arranged between the adjusting nut 8 and the middle sleeve 153, and the pre-press adjusting seat 81 is limited on the upper end of the middle sleeve 153. The distance between the upper shaft sleeve 151 and the lower shaft sleeve 152 is adjusted by adjusting the position of the adjusting nut 8 on the piston rod 6, and then the pre-press elastic force of the wave spring between the upper shaft sleeve 151 and the lower shaft sleeve 152 is adjusted.

[0033] A stroke shifting rod 811 is arranged on the piston rod 6, one end of the stroke shifting rod 811 is connected between the adjusting nut 8 and the pre-press adjusting seat 81, the other end is connected to a rack 812, the rack 812 is arranged in a rack sliding groove 813, the rack reciprocatingly slides along the rack sliding groove 813, the rack 812 is engaged with a gear 814, the gear 814 is connected to the rotating shaft of an encoder 815, the encoder is connected to the rack sliding groove 813, the rack is driven by the piston rod, the rack drives the gear to rotate, so that the encoder reads the movement data of the piston rod, and the precise control of the actuator is facilitated.

[0034] The bottom end of the piston rod 6 is connected with a valve rod assembly through a connecting nut.

[0035] Below the bottom end of the piston rod 6, a bracket 11 is connected on the shell 1, and the bracket 11 has a clamping block 12 for connecting the valve.

[0036] A screw rod 72 is connected to the top end of the piston rod 6, the screw rod 72 is threadedly connected with a screw rod sleeve 9, the screw rod sleeve 9 penetrates out of the top of the shell, and a rotating top cover 91 is installed on the top of the shell.

[0037] In use, the electromagnetic valve closes the second channel, the oil pump delivers hydraulic oil to the upper oil chamber through the first channel, the hydraulic oil in the lower oil chamber is delivered to the hydraulic cylinder through the third channel, the piston drives the piston rod to move downward, and the wave spring is compressed and deformed. After the oil pump stops delivering hydraulic oil, the electromagnetic valve opens the second channel, the wave spring returns to its original shape, and drives the piston to move upward. Thus, the piston rod is reciprocated upward and downward, and then the valve is driven.

[0038] As another embodiment, a multi-layer superimposed curved surface ring mechanism is arranged between the upper shaft sleeve 151 and the lower shaft sleeve 152, the multi-layer superimposed curved surface ring mechanism is supported between the upper shaft sleeve 151 and the lower shaft sleeve 152, and the lower shaft sleeve 152 is supported on the upper sealing cover 3.

[0039] As shown in Figures 3-5 The multi-layer superimposed curved surface ring mechanism 7 is composed of a plurality of coaxially stacked curved surface rings 711, as shown in Figure 4As shown, the curved surface ring 711 comprises a metal sheet ring having a plurality of (four in the figure) convex peaks, and a plurality of concave valleys between adjacent peaks, which are alternately and uniformly arranged along the circumference of the metal sheet ring. The curved surface ring 711 with peaks and valleys is coaxially stacked between the upper shaft sleeve 151 and the lower shaft sleeve 152, wherein the valleys of the upper curved surface ring support the peaks of the lower curved surface ring.

[0040] The plurality of curved surface rings 711 are located in the limiting sleeve 71 and elastically deformed in the limiting sleeve 71.

[0041] The curved surface ring 711 is provided with a limited rotation mechanism, which comprises a limiting protrusion 713 and a limiting groove 712. The limiting groove 712 is located on the periphery of the curved surface ring 711, and the limiting protrusion 713 is a protruding rib on the inner wall of the limiting sleeve. The rib is parallel to the piston rod and is sequentially located in the limiting groove 712 of each curved surface ring 711 from top to bottom, loosely matched with the limiting groove 712. When the curved surface ring is compressed or released, the curved surface ring moves up and down along the rib and performs limited translation and rotation within a certain range.

[0042] The limiting mechanism is provided with a plurality of limiting mechanisms, which are uniformly distributed along the axial direction of the curved surface ring. Figure 3 As shown, the limiting groove 712 is provided with two limiting grooves 712, which are uniformly distributed along the axial direction of the curved surface ring.

[0043] When the electromagnetic valve is closed, the oil pump delivers hydraulic oil to the upper oil chamber through the first channel, and the hydraulic oil in the lower oil chamber is delivered to the hydraulic cylinder through the third channel. The piston drives the piston rod to move downward, and the multi-layer stacked curved surface ring mechanism is compressed and deformed. The curved surface ring moves downward along the rib and performs limited translation and rotation within a certain range, thereby limiting the circumferential position of the curved surface ring to avoid dislocation. After the oil pump stops delivering hydraulic oil, the electromagnetic valve is opened, and the curved surface ring returns to its original state, driving the piston to move upward with the piston rod. When the curved surface ring returns to its original state, the curved surface ring moves upward along the rib, and the rib also limits the circumferential position of the curved surface ring to avoid dislocation. In this way, the piston rod is reciprocated upward and downward, thereby controlling the valve.

[0044] The above embodiments do not limit the present application in any way, and any technical solution obtained by equivalent substitution or equivalent transformation falls within the protection scope of the present application.

Claims

1. A novel hydraulic actuator, comprising a hydraulic cylinder, wherein a piston is disposed within the hydraulic cylinder, the piston dividing the hydraulic cylinder into an upper oil chamber and a lower oil chamber, a hydraulic source is disposed in the upper oil chamber, and a conveying device is disposed in the hydraulic source, the hydraulic source conveying hydraulic oil to the upper oil chamber via the conveying device; the piston is connected to a piston rod, the piston rod extending through an upper sealing cover of the hydraulic cylinder, and a sealed connection is formed between the piston rod and the upper sealing cover; the piston rod is provided with an upper bushing, characterized in that: The elastic energy storage mechanism is arranged between the upper shaft sleeve and the upper sealing cover, supported between the upper shaft sleeve and the upper sealing cover, and is a wave spring or a multi-layer superimposed curved surface ring mechanism.

2. The novel hydraulic actuating device according to claim 1, characterized in that: The multi-layer superimposed curved surface ring mechanism is composed of coaxially stacked multiple curved surface rings, and the curved surface ring comprises a metal sheet-shaped ring having a plurality of convex wave crests uniformly distributed along the circumference of the metal sheet-shaped ring.

3. The novel hydraulic actuating device as claimed in claim 2, wherein: The adjacent wave crests are provided with concave wave troughs, and the wave troughs and the wave crests are alternately and uniformly arranged along the circumference of the metal sheet-shaped ring.

4. The novel hydraulic actuating device as claimed in claim 2, wherein: The curved surface ring is arranged in the limiting sleeve and elastically deformed in the limiting sleeve.

5. The novel hydraulic actuating device as claimed in claim 2, wherein: The curved surface ring is provided with a rotation limiting mechanism, the rotation limiting mechanism comprises a limiting groove and a limiting protrusion, the limiting protrusion is located in the limiting groove, and the limiting groove moves along the limiting protrusion when the curved surface ring is deformed under pressure or released.

6. The novel hydraulic actuating device according to claim 5, characterized in that: The limiting groove is arranged on the periphery of the curved surface ring, and the limiting protrusion is a rib on the inner wall of the limiting sleeve, the rib and the piston rod are arranged in parallel, and the rib is located in the limiting groove.

7. The novel hydraulic actuating device as claimed in claim 5, wherein: The rotation limiting mechanism is provided with a plurality of rotation limiting mechanisms, and the plurality of rotation limiting mechanisms are uniformly distributed along the circumference of the curved surface ring.

8. The novel hydraulic actuating device as claimed in claim 1, wherein: The upper sealing cover and the elastic energy storage mechanism are provided with a lower shaft sleeve, the lower shaft sleeve is movably connected to an intermediate sleeve, the intermediate sleeve is movably connected to the upper shaft sleeve, and the elastic energy storage mechanism is supported between the upper shaft sleeve and the lower shaft sleeve.

9. The novel hydraulic actuating device according to claim 8, characterized in that: The intermediate sleeve has an upper intermediate boss and a lower intermediate boss, the upper shaft sleeve is provided with an upper spring boss, the upper spring boss is located between the upper intermediate boss and the lower intermediate boss, the lower shaft sleeve is provided with a lower spring boss, and the lower spring boss is located between the upper spring boss and the lower intermediate boss.

10. The novel hydraulic actuating device as claimed in claim 8, wherein: The piston rod is threadedly connected with an adjusting nut, and the adjusting nut and the intermediate sleeve are provided with a pre-pressing adjusting seat.

11. The novel hydraulic actuating device as claimed in claim 1, wherein: The piston rod is provided with a stroke lever, the stroke lever is connected to a rack, the rack is provided with a rack sliding groove, the piston rod drives the rack to reciprocate along the rack sliding groove, the rack is connected with a gear, and the gear is connected to the rotating shaft of the encoder.

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