Hydraulic actuator with encoder

Abstract

The utility model discloses a hydraulic executive device with an encoder, which comprises a shell, an oil cylinder is arranged in the shell, the oil cylinder is provided with a piston, the piston is connected with a piston rod, the piston rod is connected with a stroke deflector rod, the stroke deflector rod is connected in a stroke deflector rod insertion hole of an adjusting seat, the adjusting seat is provided with a deflector rod insertion hole, and the deflector rod insertion hole is connected with the encoder. A driving lever is arranged in the driving lever insertion hole, the driving lever is connected to a rack, the rack is provided with a rack sliding groove, the piston rod drives the rack to slide along the rack sliding groove, the rack is meshed with a gear, and the gear is connected to a rotating shaft of the encoder. The distance between the rack and the piston rod is easy to adjust through the adjusting seat, and the rack coding mechanism can be conveniently arranged in the shell. Displacement of the piston rod is detected through the rack coding mechanism, a contact mode is changed into a non-contact mode, analog signals are replaced by digital signals, the service life of the hydraulic actuator is prolonged, and the control precision of the hydraulic actuator is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of hydraulic actuators, specifically to a kind of hydraulic actuators with encoder, for accurate control valve. BACKGROUND

[0002] In heating system, hydraulic actuator is accurately controlled the opening and closure of valve by the linear motion of piston rod, so as to adjust the flow of fluid or gas in pipeline. Whether it is to cope with air conditioning system air volume dynamic adjustment, heating pipeline pressure fluctuation, or temperature change in complex environment, its hydraulic driving mechanism can output stable and reliable opening and closing driving force, even if failure, power failure phenomenon occurs, hydraulic actuator can realize power failure protection, and then close heat source, protect system.

[0003] To realize the accurate control of valve opening, hydraulic actuator is usually integrated with displacement detection device. Although the traditional slip potentiometer can obtain position signal by contact measurement, the physical wear of internal sliding parts can significantly shorten the service life. In contrast, non-contact rotary encoder has longer durability, but since its working principle depends on rotary motion, it needs to convert the linear displacement of piston rod into rotary action through mechanical conversion mechanism. This conversion design not only increases the overall structural size of the actuator, but also may interfere with the space of internal oil circuit layout, sealing system and other key components, affecting the compactness and reliability of the equipment. SUMMARY

[0004] The utility model aims at providing a kind of hydraulic actuators with encoder, which reduces the overall volume of the equipment by optimizing the transmission mechanism between the encoder and the piston rod and the internal space layout of the hydraulic actuator, changes from contact to non-contact, replaces analog signal with digital signal, and realizes high-precision control of the hydraulic actuator.

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

[0006] The hydraulic actuator with encoder comprises a housing, an oil cylinder arranged in the housing, a piston arranged in the oil cylinder, a piston rod connected to the piston, a stroke lever connected to the piston rod, a stroke lever insertion hole in an adjustment seat, a stroke lever arranged in the stroke lever insertion hole, a rack connected to the stroke lever, a rack sliding groove arranged in the rack, a gear engaged with the rack and connected to a rotating shaft of the encoder.

[0007] The adjustment seat is easy to adjust the distance between the rack and the piston rod, and the rack coding mechanism is arranged in the housing on one side of the piston rod.

[0008] The end of the stroke dial lever is provided with a plurality of convex points, and the stroke dial lever is fastened and connected in the stroke dial lever insertion hole through the convex points. The stroke dial lever and the convex points are in interference fit with the stroke dial lever insertion hole, so that the stroke dial lever can be easily inserted into the stroke dial lever insertion hole and fastened and connected in the stroke dial lever insertion hole through the convex points.

[0009] The end of the dial lever is sawtooth-shaped, the friction between the dial lever and the dial lever insertion hole is increased through the sawtooth, and the dial lever is prevented from retreating in the dial lever insertion hole.

[0010] The adjusting seat is made of plastic.

[0011] The gear is arranged in the rack sliding groove.

[0012] The rack sliding groove is provided with a dial lever accommodation hole, and when the piston rod drives the rack to slide along the rack sliding groove, the dial lever accommodation hole is used for accommodating the dial lever.

[0013] 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 oil tank, the hydraulic oil tank is provided with a conveying device, the hydraulic oil tank conveys hydraulic oil to the upper oil cavity through the conveying device, the hydraulic cylinder comprises an upper sealing cover and a lower sealing cover, the piston rod penetrates through the upper sealing cover of the hydraulic cylinder, the piston rod and the upper sealing cover are in sealing connection, the piston rod penetrates through the lower sealing cover of the hydraulic cylinder, the piston rod and the lower sealing cover are in sealing connection, an upper shaft sleeve is arranged on the piston rod, and an elastic energy storage mechanism (preferably a spring) is arranged between the upper shaft sleeve and the upper sealing cover.

[0014] In use, the conveying device conveys hydraulic oil to the upper oil cavity to drive the piston rod to move downward, and the elastic energy storage mechanism is compressed and deformed. The elastic energy storage mechanism restores to the original state and is used for driving the piston rod to move upward.

[0015] The hydraulic oil tank is connected with the upper oil cavity of the hydraulic cylinder through a first channel and a second channel, the hydraulic oil tank is connected with the lower oil cavity of the hydraulic cylinder through a third channel, the conveying device is arranged on the first channel, the conveying device conveys the hydraulic oil in the hydraulic oil tank to the upper oil cavity through the first channel, and the second channel is provided with a control valve.

[0016] The hydraulic oil tank is arranged on the upper sealing cover and located at one side of the piston rod, and the encoder is located above the upper sealing cover and at the other side of the piston rod.

[0017] The adjusting seat is used for easily adjusting the spacing between the rack and the piston rod, and the rack coding mechanism is arranged in the shell.

[0018] The utility model discloses a rack coding mechanism and hydraulic oil cavity are arranged in the casing, and are located the both sides of piston rod, can utilize the space in casing reasonably, has reduced the whole volume of equipment.

[0019] The utility model discloses a rack coding mechanism detects the displacement of piston rod, changes contact type to non - contact type, with digital signal replaces analog signal, realizes the high accuracy control of hydraulic actuator, improves the service life and control accuracy of hydraulic actuator. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model makes further detailed explanation in combination with the specific embodiment and the drawing.

[0021] Figure 1 It is hydraulic actuator structure schematic drawing.

[0022] Figure 2 It is hydraulic actuator internal rack coding mechanism and hydraulic oil cavity structure schematic drawing.

[0023] Figure 3 It is rack coding mechanism structure schematic drawing.

[0024] Figure 4 It is rack coding mechanism structure schematic drawing. SPECIFIC EMBODIMENT

[0025] As Figures 1-4 Shown, hydraulic actuator, including casing 1, the casing 1 bottom end sets up lower sealing cover 2, the lower sealing cover 2 top sets up upper sealing cover 3, the lower sealing cover 2 and upper sealing cover 3 between setting up hydraulic cylinder 4, the hydraulic cylinder 4 inside setting up piston 5, the piston 5 will hydraulic cylinder 4 divide into upper oil cavity and lower oil cavity, the upper sealing cover 3 on setting up hydraulic oil tank 41 through first passage, second passage and the upper oil cavity of hydraulic cylinder 4 are connected, the hydraulic oil tank 41 passes through third passage and is connected with the lower oil cavity of hydraulic cylinder 4, the hydraulic oil tank 41 passes through oil pump (or other same type delivery device) and is transported to the upper oil cavity through first passage, the second passage is provided with solenoid valve (or other same type control valve), the second passage is closed through solenoid valve control intercommunication.

[0026] The piston 5 is connected on the piston rod 6, the piston rod 6 passes out the upper sealing cover 3 of hydraulic cylinder, the piston rod 6 and upper sealing cover 3 are sealedly connected through sealing ring, the piston rod 6 passes out the lower sealing cover 2 of hydraulic cylinder, the piston rod 6 and lower sealing cover 2 are sealedly connected through sealing ring.

[0027] The piston rod 6 is provided with an upper shaft sleeve 151, and a spring 7 (or other elastic energy storage mechanism of the same type) is arranged between the upper shaft sleeve 151 and the upper sealing cover 3, and the spring 7 is supported between the upper shaft sleeve 151 and the upper sealing cover 3. The adjusting nut 8 is threadedly connected to the piston rod 6, and a pre-pressing adjusting seat 81 is arranged between the adjusting nut 8 and the upper shaft sleeve 151, and the pre-pressing adjusting seat 81 is limited on the upper end of the upper shaft sleeve 151. The distance between the upper shaft sleeve 151 and the upper sealing cover 3 is adjusted by adjusting the position of the adjusting nut 8 on the piston rod 6, and then the pre-pressing elastic force of the spring 7 is adjusted.

[0028] The bottom end of the piston rod 6 is connected to a valve rod assembly through a connecting nut, and below the bottom end of the piston rod 6, the shell 1 is connected with a bracket 11, and the bracket 11 has a clamping block 12 for connecting a valve.

[0029] The piston rod 6 is connected with a rack coding mechanism, which includes a stroke lever 811, one end of the stroke lever 811 is connected between the adjusting nut 8 and the pre-pressing adjusting seat 81, and the other end of the stroke lever 811 is provided with a plurality of convex points 8111 on the upper surface, the stroke lever 811 is tightly connected in the stroke lever insertion hole 8161 of the plastic adjusting seat 816 through the convex points 8111, the plastic adjusting seat 816 is provided with a lever insertion hole 8162, the lever insertion hole 8162 is connected with a lever 817, the head end of the lever 817 is serrated 8171, and the lever 817 is tightly connected in the lever insertion hole 8162 through the serrated 8171, and the serration is used to increase the friction between the lever and the lever insertion hole to prevent the lever from retreating in the lever insertion hole.

[0030] The lever 817 is connected to a rack 812, the rack 812 is movably connected in a rack sliding groove 813, a gear 814 is arranged in the rack sliding groove 813, the gear 814 is engaged with the rack 812, the gear 814 is connected to the rotating shaft of an encoder 815, and the encoder is connected to the rack sliding groove 813. When the piston rod drives the rack 812 to move, the rack 812 slides along the rack sliding groove 813, the rack 812 drives the gear 814 to rotate, and then the encoder detects the movement of the piston rod.

[0031] In order to give way to the lever, the rack sliding groove 813 is provided with a lever giving way hole 8131, and when the piston rod 6 drives the rack 812 to slide along the rack sliding groove 813, the lever giving way hole 8131 is used for giving way to the lever 817.

[0032] 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 spring is compressed and deformed.

[0033] The above embodiments do not limit the utility model in any way, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. Hydraulic actuator with an encoder, comprising a housing, in which an oil cylinder is arranged, which is provided with a piston, to which a piston rod is connected, characterized in that: The piston rod is connected with a stroke shifting rod, the stroke shifting rod is connected in a stroke shifting rod insertion hole of an adjusting seat, the adjusting seat is provided with a shifting rod insertion hole, a shifting rod is arranged in the shifting rod insertion hole, the shifting rod is connected with a rack, the rack is provided with a rack sliding groove, the piston rod drives the rack to slide along the rack sliding groove, the rack is engaged with a gear, and the gear is connected with a rotating shaft of an encoder.

2. Hydraulic actuator with encoder according to claim 1, characterized in that The stroke shifting rod is provided with a plurality of convex points at the end, and the stroke shifting rod is fastened and connected in the stroke shifting rod insertion hole through the convex points.

3. Hydraulic actuator with encoder according to claim 1, characterized in that The end of the shifting rod is serrated.

4. The hydraulic actuator with an encoder of claim 1, wherein: The adjusting seat is made of plastic.

5. The hydraulic actuator with an encoder of claim 1, wherein: The gear is arranged in the rack sliding groove.

6. The hydraulic actuator with an encoder of claim 1, wherein: The rack sliding groove is provided with a shifting rod accommodation hole, and when the piston rod drives the rack to slide along the rack sliding groove, the shifting rod accommodation hole is used for accommodating the shifting rod.

7. The hydraulic actuator with an encoder of claim 1, wherein: 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 oil tank, the hydraulic oil tank is provided with a conveying device, the hydraulic oil tank conveys hydraulic oil to the upper oil cavity through the conveying device, the hydraulic cylinder comprises an upper sealing cover and a lower sealing cover, the piston rod penetrates through the upper sealing cover of the hydraulic cylinder, the piston rod and the upper sealing cover are in sealing connection, the piston rod penetrates through the lower sealing cover of the hydraulic cylinder, the piston rod and the lower sealing cover are in sealing connection, an upper shaft sleeve is arranged on the piston rod, an elastic energy storage mechanism is arranged between the upper shaft sleeve and the upper sealing cover, and the elastic energy storage mechanism is supported between the upper shaft sleeve and the upper sealing cover.

8. Hydraulic actuator with encoder according to claim 7, characterized in that The hydraulic oil tank is connected with the upper oil cavity of the hydraulic cylinder through a first channel and a second channel, the hydraulic oil tank is connected with the lower oil cavity of the hydraulic cylinder through a third channel, the conveying device is arranged on the first channel, the conveying device conveys the hydraulic oil in the hydraulic oil tank to the upper oil cavity through the first channel, the second channel is provided with a control valve, and the second channel is controlled to be communicated and closed through an electromagnetic valve.

9. Hydraulic actuator with encoder according to claim 7, characterized in that The hydraulic oil tank is arranged on the upper sealing cover and located on one side of the piston rod, and the encoder is located above the upper sealing cover and on the other side of the piston rod.

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