CN111470446B - Jack and stroke measuring method thereof - Google Patents
Jack and stroke measuring method thereof Download PDFInfo
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- CN111470446B CN111470446B CN202010184723.7A CN202010184723A CN111470446B CN 111470446 B CN111470446 B CN 111470446B CN 202010184723 A CN202010184723 A CN 202010184723A CN 111470446 B CN111470446 B CN 111470446B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 35
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 230000033001 locomotion Effects 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 11
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 3
- 235000014676 Phragmites communis Nutrition 0.000 description 8
- 239000007788 liquid Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/283—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using a cable wrapped on a drum and attached to the piston
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Structural Engineering (AREA)
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- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
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- Actuator (AREA)
Abstract
The embodiment of the invention discloses a jack and a stroke measuring method thereof, relates to the technical field of machinery, and can perform high-reliability stroke measurement under the condition of ensuring the compact structure of the jack. The jack comprises: the cylinder body and the piston are matched with the cylinder body, and the cylinder body and the piston are sealed to form a piston cavity; a stay rope coding device is fixed on the inner wall of the piston cavity; the stay cord coding device is connected with the inner wall of the piston cavity in a sealing way through a sealing mechanism and divides the piston cavity into a first cavity and a second cavity, wherein the first cavity is close to the piston and sealed by the piston, and the second cavity is far away from the piston and isolated from the piston; the pull rope mechanism of the pull rope coding device is positioned in the first chamber, and the data processing component of the pull rope coding device is positioned in the second chamber; the wire outlet end of the pull rope mechanism is fixedly connected with the piston; the data processing component is connected with the pull rope mechanism.
Description
Technical Field
The invention relates to the technical field of machinery, in particular to a jack and a stroke measuring method thereof.
Background
The jack is light and small lifting equipment which uses a rigid jacking piece as a working device and jacks up a heavy object in a small stroke through a top bracket or a bottom supporting claw, and can be used for departments such as factories and mines, transportation and the like to repair vehicles and work such as other lifting and supporting. Taking a hydraulic support as an example, the conventional simple frame type jack comprises various jacks such as a stand column, a balance, pushing, lifting, side pushing, stretching, side protection and the like.
In order to complete the smooth lifting and lowering of the weight, it is necessary to know the real-time travel of the jack in order to precisely control the jack. In the related art, the following measuring modes of jack strokes mainly exist:
the jack adopting the external stay wire type displacement sensor occupies part of assembly space, has weak anti-collision capacity, and cannot meet actual application requirements for compact-structure equipment and application places with severe external environments.
And the jack stroke is measured through an electric signal generated by the relative movement of the reed pipe and the magnetic ring. However, the sensor is installed by adding an elongated hole on the piston rod, the coaxiality of the elongated hole and the sensor rod body is not easy to control, and the reed switch and the circuit system are in an isolated cavity, but are immersed in emulsion for a long time and impacted by hydraulic pressure, so that the reliability is difficult to guarantee.
According to the method, although the sleeve can be arranged to protect the infrared receiving and transmitting module, the measuring guide rod cannot be effectively protected, an external structure still needs to occupy a certain assembly space, and the application limitation on a compact structure or a coal seam fragment impact scene is large.
In a word, how to carry out the journey measurement of high reliability under the condition of guaranteeing the compact structure of jack, the relevant field does not have effective solution yet.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a jack and a stroke measurement method thereof, which can perform highly reliable stroke measurement under the condition of ensuring a compact structure of the jack.
In a first aspect, an embodiment of the present invention provides a jack, comprising: the cylinder body and the piston are matched with the cylinder body, and the cylinder body and the piston are sealed to form a piston cavity; a stay rope coding device is fixed on the inner wall of the piston cavity; the stay cord coding device is connected with the inner wall of the piston cavity in a sealing way through a sealing mechanism and divides the piston cavity into a first cavity and a second cavity, wherein the first cavity is close to the piston and sealed by the piston, and the second cavity is far away from the piston and isolated from the piston; the pull rope mechanism of the pull rope coding device is positioned in the first chamber, and the data processing component of the pull rope coding device is positioned in the second chamber; the wire outlet end of the pull rope mechanism is fixedly connected with the piston so as to collect physical signals of the movement of the piston through the extension or retraction of the pull rope; the data processing component is connected with the pull rope mechanism to convert the physical signal into an electric signal, so as to obtain the stroke information of the piston.
Optionally, the first chamber is used for sucking fluid or discharging fluid according to a control signal of the jack so as to enable the piston to reciprocate.
Optionally, the pull rope coding device further comprises a communication part, and the communication part is electrically connected with the data processing component through a lead wire.
Optionally, a through hole is provided on a wall of the cylinder body of the second chamber, and the lead wire passes through the through hole to guide the communication part to the outside of the cylinder body.
Optionally, the travel information includes displacement information of the piston and/or velocity information of the piston.
Optionally, the outlet end of the pull rope coding device is pulled out from the winding drum and extends, and the extending direction is parallel to the moving direction of the piston.
Optionally, a limiting device is arranged on the inner wall of the first chamber and surrounds the movement direction of the piston, and the stay rope mechanism of the stay rope coding device is arranged in the first chamber and is positioned between the limiting device and the second chamber; when the piston moves to the limiting device, the piston is limited by the limiting device to be static.
Optionally, the pull rope coding device is fixed on the inner wall of the piston cavity through a clamping device.
In a second aspect, an embodiment of the present invention further provides a stroke measurement method of any one of the jacks provided by the embodiment of the present invention, including: the physical signal of the piston motion is collected through a pull rope of the pull rope coding device; and converting the physical signal into an electric signal to obtain the stroke information of the piston.
Optionally, the acquiring the physical signal of the piston motion by the pull rope of the pull rope coding device includes: when the first chamber sucks fluid, the pull rope is pulled by the piston to extend so as to collect a physical signal of the process that the piston is jacked up; when the first chamber discharges fluid, the pull cord retracts to collect a physical signal of the piston fallback process.
According to the jack and the stroke measuring method thereof provided by the embodiment of the invention, the stay cord coding device is arranged in the piston cavity of the jack, the piston cavity is divided into the first cavity and the second cavity which are mutually sealed, physical signals of piston movement are collected in the first cavity through the stay cord mechanism of the stay cord coding device, and the data processing component converts the collected physical signals into electric signals in the second cavity, so that the stroke information of the jack piston can be obtained. Therefore, the sensor for measuring the stroke is arranged in the jack, so that equipment damage caused by complex environment interference or mechanical collision of the external sensor can be effectively avoided, the assembly space of the jack can be saved, and the equipment size is effectively reduced; the rope pulling coding device replaces a reed pipe matched with a traditional magnetic ring, so that mechanical impact of emulsion caused by drilling an elongated hole in a piston rod on the reed pipe is effectively avoided, the reliability of equipment is greatly improved, and high-reliability stroke measurement can be performed under the condition that the jack structure is compact.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a jack according to an embodiment of the present invention;
fig. 2 is a schematic view of another structure of a jack according to an embodiment of the present invention;
fig. 3 is a schematic view of still another structure of a jack according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for measuring a stroke of a jack according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For a better understanding of the invention, the jack principle will first be briefly described. The jack can be divided into three types according to structural characteristics, namely a rack jack, a screw jack and a hydraulic (e.g. oil pressure) jack. The first two inventions are not related and therefore only the hydraulic jack principle will be described. The hydraulic jack depends on hydraulic transmission (also can be an air pressure jack and depends on air pressure transmission). The most basic principle on which hydraulic transmission is based is pascal's law, that is, the pressure across a liquid is uniform. Thus, in a balanced system, the pressure exerted on the smaller piston is smaller and the pressure exerted on the larger piston is also larger, thus being able to keep the liquid stationary. So that different pressures at different ends can be obtained through liquid transmission, and the purpose of transformation can be achieved.
When the hydraulic jack is used, a weight can be placed on the piston with a larger area, and the stress of the piston with the larger area is increased by controlling the liquid pressure, so that the weight is jacked up. In actual use, the stroke information of the jack needs to be accurately fed back to the control end of the jack in time, so that the jack is accurately controlled by using the fed back information, and the weight is jacked to the required height.
Therefore, the embodiment of the invention provides the jack, and high-reliability stroke measurement can be performed under the condition that the jack is ensured to be compact in structure.
As shown in fig. 1, an embodiment of the present invention provides a jack including:
the cylinder body 1 and the piston 2 matched with the cylinder body 1, and the cylinder body 1 and the piston 2 are sealed to form a piston cavity 3; a stay rope coding device 4 is fixed on the inner wall 30 of the piston cavity 3; the stay cord coding device 4 is hermetically connected with the inner wall 30 of the piston cavity 3 through the sealing mechanism 5 and divides the piston cavity 3 into a first chamber 31 and a second chamber 32, wherein the first chamber 31 is close to the piston 2 and is sealed by the piston 2, and the second chamber 32 is far away from the piston 2 and is isolated from the piston 2;
the pull rope mechanism 41 of the pull rope coding device 4 is positioned in the first chamber 31, and the data processing component 42 of the pull rope coding device 4 is positioned in the second chamber 32; the wire outlet end 410 of the pull rope mechanism 41 is fixedly connected with the piston 2 so as to collect physical signals of the movement of the piston 2 through the extension or retraction of the pull rope; the data processing unit 42 is connected to the pull-cord mechanism 41 to convert the physical signal into an electrical signal, thereby obtaining the stroke information of the piston.
According to the jack provided by the embodiment of the invention, the stay cord coding device is arranged in the piston cavity 3 of the jack, the piston cavity 3 is divided into the first cavity 31 and the second cavity 32 which are mutually sealed, the physical signals of the movement of the piston 2 are collected in the first cavity 31 through the stay cord mechanism 41 of the stay cord coding device 4, and the data processing component 42 converts the collected physical signals into the electrical signals in the second cavity 32, so that the travel information of the piston 2 of the jack can be obtained. Therefore, the sensor for measuring the stroke is arranged in the jack, so that equipment damage caused by complex environment interference or mechanical collision of the external sensor can be effectively avoided, the assembly space of the jack can be saved, and the equipment size is effectively reduced; the rope pulling coding device replaces a reed pipe matched with a traditional magnetic ring, so that mechanical impact of emulsion caused by drilling an elongated hole in a piston rod on the reed pipe is effectively avoided, the reliability of equipment is greatly improved, and high-reliability stroke measurement can be performed under the condition that the jack structure is compact.
In the embodiment of the invention, a weight to be jacked up can be placed on the piston 2. The piston cavity 3 is the cavity in which the piston 2 is located, and the two cavities are in airtight fit. The piston 2 can perform a reciprocating movement in the piston chamber 3, which is pressed inward or pulled outward, so that, as a whole, the piston chamber 3 can be approximately cylindrical, the height direction of the column being parallel to the direction of movement of the piston 2. While the cross-section of the post may be of various shapes, such as circular, polygonal, irregular, etc., as long as the cross-section of the piston chamber 3 is compatible with the shape of the piston 2. Alternatively, in an embodiment of the present invention, the piston cavity 3 may be formed by splicing a plurality of cavities with different cross sections, so long as the portion that can be reached when the piston 2 moves remains engaged with the piston 2, and the portion that cannot be reached when the piston 2 moves may be any shape.
In the embodiment of the invention, the piston chamber 3 is divided into two chambers by the pull cord coding device 4 arranged therein, wherein the first chamber 31 is close to the piston 2 and sealed by the piston 2, while the second chamber 32 is remote from the piston 2 and isolated from the piston 2. Thus, the first chamber 31 is the pressurized side and receives pressure from the fluid in the piston 2 and the first chamber 31. While the second chamber 32 is the non-pressurized side and may be only at normal atmospheric pressure, the second chamber 32 may be free of fluid in the first chamber 31. In order to ensure the tightness between the first chamber 31 and the second chamber 32, a sealing mechanism 5 is also provided between the pull rope coding device 4 and the inner wall 30 of the piston chamber 3. In this way, the piston 2 reciprocates only in the first chamber 31 without affecting various devices in the second chamber 32, effectively ensuring the reliability of the devices in the second chamber 32.
Specifically, a suction port and a discharge port (not shown) may be provided in the first chamber 31, and the first chamber 31 may be used to suck fluid from the suction port or discharge fluid from the discharge port according to a control signal of the jack to reciprocate the piston 2. Alternatively, the fluid to be inhaled or expelled may be either a liquid or a gas. The jack provided by the embodiment of the invention can meet the application requirements of different pneumatic or hydraulic power source occasions. The embodiments of the present invention are not limited in this regard.
In the embodiment of the present invention, the stroke information of the jack, that is, the stroke information of the piston 2 is acquired. Alternatively, the travel information may include displacement information of the piston 2 and/or velocity information of the piston 2. The stroke information of the piston 2 can be realized by the pull rope coding device 4. The pull-cord encoding device 4 may include a pull-cord mechanism 41 and a data processing component 42, wherein the pull-cord mechanism 41 may be used to sense and collect physical information of the movement of the piston 2, and the data processing component 42 may be used to process the collected physical information, for example, convert the physical signal into an electrical signal, and further process the electrical signal to obtain digital information that is convenient for the user to view, for example, raised by 363 mm, etc.
Specifically, the pull-cord mechanism 41 may be disposed in the first chamber 31. In one embodiment of the invention, the pull-cord mechanism 41 may include a base to which the cord reel is secured. The wire is wound around the wire drum, and the wire end is pulled out from the wire drum to form the wire outlet end 410 and is fixed to the piston 2. Alternatively, the outlet 410 may be secured to the piston 2 by various means such as threading, hooking, latching, etc.
Alternatively, the connection position of the wire outlet end on the piston 2 may be various, as long as the movement and measurement accuracy of the piston 2 are not affected. For example, in one embodiment of the present invention, the outlet may be mounted on the bottom surface of the piston 2 facing the piston chamber 3 for ease of measurement. To ensure accuracy of measurement of the stroke of the piston 2, in one embodiment of the invention, the outlet end 410 of the rope encoder 4 is pulled out of the rope drum and extended in a direction parallel to the direction of movement of the piston 2.
When the jack works, the rope wound on the rope drum can be pulled out and retracted to reciprocate along with the expansion and contraction of the piston 2 under the action of the elastic mechanism, the data processing component 42 can acquire the rotation motion of the rope drum and convert the rotation motion into linear motion, and the acquired motion signal is converted into an electric signal and further processed, so that the stroke information such as the accurate displacement and/or the speed of the jack piston 2 is obtained. After determining the travel information of the jack, the data processing unit 42 may directly transmit the travel information to a receiver outside the cylinder 1 of the jack through wireless communication.
Alternatively, in another embodiment of the present invention, the travel information may be transmitted to the outside of the jack by means of wired communication. For example, as shown in fig. 2, the rope encoder 4 may further include a communication unit 43, and the communication unit 43 may be electrically connected to the data processing unit 42 through the lead wire 6. Alternatively, the cylinder wall of the second chamber 32 may be provided with a through hole 11, and the lead wire 6 may pass through the through hole 11 to guide the communication part 43 to the outside of the cylinder 1 and be fixed to the outer surface of the jack cylinder 1. Alternatively, the communication section 43 may include various types of communication interfaces that can be used to connect various devices such as a computer, a terminal, and the like, thereby enabling signal transmission between the stroke measurement of the jack inner piston 2 and an external control device.
Since the piston 2 and the pull rope mechanism 41 of the pull rope coding device 4 are both positioned in the first chamber 31, in order to avoid the pull rope mechanism 41 from being damaged by collision during the movement of the piston 2, in one embodiment of the invention, a limiting device 7 is arranged on the inner wall of the first chamber 31 and surrounds the movement direction of the piston 2; the string mechanism 41 of the string-encoding device 4 is disposed in the first chamber 31 and between the stopper 7 and the second chamber 32. When the piston 2 moves to the limiting device 7, the piston is limited and static by the limiting device 7. In this way, the piston 2 cannot go beyond the stopper 7, but can move only beyond the range blocked by the stopper 7, and the rope pulling mechanism 41 can be prevented from being collided by the piston 2 only by being provided in the range defined by the stopper 7.
Alternatively, the specific shape and distribution position of the limiting device 7 are not limited, and may be a complete ring-mounted structure fixed on the inner wall of the first chamber 31, or may be one or more protruding structures that are scattered and distributed, so long as the piston 2 can be prevented from going forward continuously.
In order to provide a suitable positioning of the pull cord encoder 4 in the piston chamber 3, in one embodiment of the invention the pull cord encoder 4 may be fastened to the inner wall 30 of the piston chamber 3 by means of the detent means 8, and the connection of the pull cord encoder 4 to the inner wall 30 may be provided with a sealing means 5, so that the piston chamber 3 is divided into a first chamber 31 and a second chamber 32 and an effective seal is formed.
Alternatively, as shown in fig. 3, in another embodiment of the present invention, a receiving chamber 9 may be provided in the bottom of the jack first chamber 31 opposite to the piston 2, the receiving chamber 9 being sized and shaped to accommodate the rope encoder 4 so that the rope encoder 4 is properly positioned therein. In this way, the narrow space formed by the accommodating cavity 9 can not only realize the arrangement of the stay cord coding device 4, but also effectively block the collision impact of the piston 2 on the stay cord coding device 4.
Correspondingly, the embodiment of the invention also provides a stroke measurement method of any jack provided by the embodiment, which can perform high-reliability stroke measurement under the condition of ensuring the compact structure of the jack.
As shown in fig. 4, the stroke measurement method of the jack according to the embodiment of the present invention may include:
s101, acquiring physical signals of the piston motion through a pull rope mechanism of the pull rope coding device;
s102, converting the physical signal into an electric signal to obtain the stroke information of the piston.
According to the stroke measuring method of the jack provided by the embodiment of the invention, the stay rope coding device 4 is arranged in the piston cavity 3 of the jack, the piston cavity 3 is divided into the first cavity 31 and the second cavity 32 which are mutually sealed, physical signals of the movement of the piston 2 are collected in the first cavity 31 through the stay rope mechanism 41 of the stay rope coding device 4, and the data processing component 42 converts the collected physical signals into electrical signals in the second cavity 32, so that the stroke information of the piston 2 of the jack can be obtained. Therefore, the sensor for measuring the stroke is arranged in the jack, so that equipment damage caused by complex environment interference or mechanical collision of the external sensor can be effectively avoided, the assembly space of the jack can be saved, and the equipment size is effectively reduced; the rope pulling coding device replaces a reed pipe matched with a traditional magnetic ring, so that mechanical impact of emulsion caused by drilling an elongated hole in a piston rod on the reed pipe is effectively avoided, the reliability of equipment is greatly improved, and high-reliability stroke measurement can be performed under the condition that the jack structure is compact.
Optionally, the step S101 of collecting the physical signal of the piston motion by the pull rope mechanism of the pull rope coding device includes:
when the first chamber sucks fluid, the outlet end of the pull rope mechanism is pulled by the piston to extend so as to collect physical signals of the process that the piston is jacked up;
when the first chamber discharges fluid, the outlet end of the pull rope mechanism is retracted so as to collect a physical signal of the piston falling process.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments in part.
For convenience of description, the above apparatus is described as being functionally divided into various units/modules, respectively. Of course, the functions of the various elements/modules may be implemented in the same piece or pieces of software and/or hardware when implementing the present invention.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (7)
1. A jack, comprising:
the cylinder body and the piston are matched with the cylinder body, and the cylinder body and the piston are sealed to form a piston cavity; a stay rope coding device is fixed on the inner wall of the piston cavity; the stay cord coding device is connected with the inner wall of the piston cavity in a sealing way through a sealing mechanism and divides the piston cavity into a first cavity and a second cavity, wherein the first cavity is close to the piston and sealed by the piston, the second cavity is far away from the piston and isolated from the piston, the first cavity is a pressurizing side and can bear the pressure of fluid from the piston and the first cavity, the second cavity is a non-pressurizing side and can be at normal atmospheric pressure, and the second cavity can be free of the fluid in the first cavity;
the pull rope mechanism of the pull rope coding device is positioned in the first chamber, and the data processing component of the pull rope coding device is positioned in the second chamber; the wire outlet end of the pull rope mechanism is fixedly connected with the piston so as to collect physical signals of the movement of the piston through the extension or retraction of the pull rope; the data processing component is connected with the pull rope mechanism to convert the physical signal into an electric signal so as to obtain the stroke information of the piston;
the stay cord coding device also comprises a communication part, wherein the communication part is electrically connected with the data processing component through a lead wire;
a through hole is formed in the wall of the cylinder body of the second chamber, and the lead wire penetrates through the through hole to guide the communication part to the outside of the cylinder body;
or alternatively;
after the data processing component determines the travel information of the jack, the data processing component sends the travel information to a receiver outside the cylinder body in a wireless communication mode.
2. A jack according to claim 1 wherein the first chamber is adapted to draw in fluid or expel fluid in response to a control signal from the jack to reciprocate the piston.
3. Jack according to claim 1, characterized in that the stroke information comprises displacement information of the piston and/or velocity information of the piston.
4. A jack according to claim 1 wherein the outlet end of the rope encoding means is pulled from the spool and extends in a direction parallel to the direction of movement of the piston.
5. The jack of claim 1, wherein a limiting device is provided on an inner wall of the first chamber around a movement direction of the piston, and the stay cord mechanism of the stay cord encoding device is provided in the first chamber between the limiting device and the second chamber; when the piston moves to the limiting device, the piston is limited by the limiting device to be static.
6. A jack according to any one of claims 1 to 5 wherein the stay cord encoding means is secured to the inner wall of the piston chamber by detent means.
7. A method of stroke measurement for a jack as claimed in any one of claims 1 to 6, comprising:
the physical signal of the piston motion is collected through a pull rope of the pull rope coding device;
converting the physical signal into an electric signal to obtain stroke information of the piston;
transmitting the stroke information of the piston in a wired communication mode and/or a wireless communication mode;
when the first chamber sucks fluid, the pull rope is pulled by the piston to extend so as to collect a physical signal of the process that the piston is jacked up;
when the first chamber discharges fluid, the pull cord retracts to collect a physical signal of the piston fallback process.
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| CN202010184723.7A CN111470446B (en) | 2020-03-16 | 2020-03-16 | Jack and stroke measuring method thereof |
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| CN202010184723.7A CN111470446B (en) | 2020-03-16 | 2020-03-16 | Jack and stroke measuring method thereof |
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| CN111470446B true CN111470446B (en) | 2024-03-26 |
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| CN112503056A (en) * | 2020-11-17 | 2021-03-16 | 中联重科股份有限公司 | Oil cylinder, multi-oil-cylinder synchronous control system, control method and crane |
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| JPH11336714A (en) * | 1998-05-21 | 1999-12-07 | Toyota Autom Loom Works Ltd | Stroke position detector for fluid pressure cylinder and lift cylinder for fork lift |
| CN1584350A (en) * | 2004-06-04 | 2005-02-23 | 浙江大学 | Single rod and rough symmetric double actuating surfaces hydraulic cylinder with internal displacement sensor |
| US10113883B1 (en) * | 2016-01-08 | 2018-10-30 | Control Products, Inc. | Hybrid sensor system and method of use |
| CN211895854U (en) * | 2020-03-16 | 2020-11-10 | 天地科技股份有限公司 | Jack |
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| JPH11336714A (en) * | 1998-05-21 | 1999-12-07 | Toyota Autom Loom Works Ltd | Stroke position detector for fluid pressure cylinder and lift cylinder for fork lift |
| CN1584350A (en) * | 2004-06-04 | 2005-02-23 | 浙江大学 | Single rod and rough symmetric double actuating surfaces hydraulic cylinder with internal displacement sensor |
| US10113883B1 (en) * | 2016-01-08 | 2018-10-30 | Control Products, Inc. | Hybrid sensor system and method of use |
| CN211895854U (en) * | 2020-03-16 | 2020-11-10 | 天地科技股份有限公司 | Jack |
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