CN109763973B - Inductive signal detection device for pump and connection structure thereof - Google Patents
Inductive signal detection device for pump and connection structure thereof Download PDFInfo
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- CN109763973B CN109763973B CN201910204965.5A CN201910204965A CN109763973B CN 109763973 B CN109763973 B CN 109763973B CN 201910204965 A CN201910204965 A CN 201910204965A CN 109763973 B CN109763973 B CN 109763973B
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- 238000001514 detection method Methods 0.000 title claims abstract description 28
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- 230000006698 induction Effects 0.000 claims description 53
- 238000007789 sealing Methods 0.000 claims description 41
- 230000033001 locomotion Effects 0.000 claims description 16
- 238000012546 transfer Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000001960 triggered effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
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- 238000013461 design Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
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Abstract
The invention relates to an inductive signal detection device for a pump and a connecting structure thereof, wherein the device comprises an outer sleeve body, a transmission rod is slidably connected in the outer sleeve body, one end of the transmission rod is a signal trigger end, and the other end of the transmission rod is a mechanical contact end for contacting a tested object and enabling the transmission rod to move towards the signal trigger end; the outer sleeve body is provided with an inductive sensor corresponding to the signal trigger end so as to trigger the inductive sensor when the transmission rod moves towards the signal trigger end; a return mechanism is arranged between the outer sleeve body and the transmission rod so that the transmission rod is kept at an initial setting position of the non-triggering inductive sensor when the mechanical contact end of the transmission rod is not contacted with the measured object. The invention can reflect the specific position condition of the measured object more timely, accurately, truly and reliably, effectively prolongs the service life, reduces the whole space occupation, and has wider applicable environment and range.
Description
Technical Field
The invention belongs to the key technical field of hydraulic diaphragm pumps, and particularly relates to an inductive signal detection device for a pump and a connection structure thereof.
Background
The part of the water pump comprises a hydraulic system, as disclosed in CN109139434A, CN102562549A, when the water pump is used, the specific position of a moving part in the water pump needs to be detected and a signal is correspondingly output so as to realize subsequent actions, because of the structural factors and complexity of the whole system, a signal generator adopting a magnetic induction type sensor mode is adopted at present, the structure of the signal generator is as shown in figure 1, a magnetic ring 102 is assembled on a guide rod 1 of a measured object, and the guide rod 1 is assembled in a hydraulic chamber 5 and reciprocates; the magnetic induction sensor 107 is assembled in the signal box lower sleeve 106, and then assembled on the signal bottom box 105 together, and heat-resistant glue 103 is injected between the signal box lower sleeve 106 and the signal bottom box 105; the signal box lower sleeve 106 fits together with the signal box upper sleeve 100 and fits together within the pressure-bearing signal box 108; the whole signal generator is assembled together on the side wall of the hydraulic chamber 5 and the distance a between the signal generator and the guide rod 1 is controlled to avoid interference and the magnetic induction distance L is controlled.
During use, the existing signal generator is found to have the following disadvantages:
1. because the magnetic induction sensor 107 and the magnetic ring 102 are operated by non-contact magnetic field change, in the hydraulic chamber, the movement speed of the guide rod 1 and the flow characteristic of hydraulic oil can influence the induction distance L between the magnetic ring 102 and the magnetic induction sensor 107, that is, when the magnetic ring 102 and the magnetic induction sensor 107 are sensed each time, the value L has a larger change range, not a fixed value, so that the real position condition of the guide rod 1 of the moving part can not be reflected timely and accurately each time of induction.
2. Because the magnetic ring 102 is made of magnetic material, the magnetic field can be changed due to factors such as temperature, vibration and the like, when the magnetic field is weakened and changed, the induction distance L can also be changed and deviate from the original design, so that the specific position of the guide rod 1 can not be truly reflected.
3. The magnetic induction sensor 107 is mostly of normal temperature and normal pressure type, so that the magnetic induction sensor 107 needs to be protected by a pressure-bearing signal box 108, the pressure-bearing signal box 108 has a narrow space, the magnetic induction sensor 107 can generate heat during operation, if the temperature rise in the pressure-bearing signal box 108 is further aggravated due to heat conduction in a high-temperature hydraulic medium, and the service life and the detection reliability of the magnetic induction sensor 107 are further affected.
4. When the device is applied to a higher magnetic field environment, the sensing distance L becomes more uncontrollable every time, and the reliability, timeliness and accuracy are greatly reduced.
5. Since the magnetic ring 102 and the magnetic induction sensor 107 are non-contact-type inductions, a magnetic induction distance L is necessary, and thus the space size of the entire structure is increased in the moving direction of the guide bar 1.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the inductive signal detection device for the pump and the connecting structure thereof, so that the specific position condition of a detected object can be reflected more timely, accurately, truly and reliably, the service life is prolonged, and the space occupation is reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
the inductive signal detection device for the pump comprises an outer sleeve body, wherein a transmission rod is slidably connected in the outer sleeve body, one end of the transmission rod is a signal trigger end, and the other end of the transmission rod is a mechanical contact end for contacting with a tested object and enabling the transmission rod to move towards the signal trigger end; the outer sleeve body is provided with an inductive sensor corresponding to the signal trigger end so as to trigger the inductive sensor when the transmission rod moves towards the signal trigger end; a return mechanism is arranged between the outer sleeve body and the transmission rod so that the transmission rod is kept at an initial setting position of the non-triggering inductive sensor when the mechanical contact end of the transmission rod is not contacted with the measured object.
Further perfecting the technical scheme, the signal trigger end of the transmission rod is connected with a displacement amplification mechanism so as to trigger the inductive sensor through the displacement amplification mechanism when the transmission rod moves towards the signal trigger end of the transmission rod; the displacement amplifying mechanism comprises a rotary induction block, the rotary induction block is rotatably connected with a signal trigger end of the transmission rod through a force transmission pin, the rotary induction block is rotatably connected with the outer sleeve body through a rotary pin, the axis of the force transmission pin is perpendicular to the axis of the transmission rod, and the force transmission pin and the axis of the rotary pin are mutually parallel so that the rotary induction block can rotate by taking the rotary pin as a rotary center through the force transmission pin when the transmission rod axially moves; the rotary sensing block is provided with a triggering end face, and the vertical distance from the triggering end face to the rotary pin is larger than the vertical distance from the force transmission pin to the rotary pin; the inductive sensor corresponds to the triggering end face of the rotary sensing block so as to be triggered when the triggering end face enters the sensing area of the rotary sensing block.
Further, the triggering end face is a cylindrical surface so that the triggering distance of the rotary sensing block is consistent in the rotation triggering process.
Further, the corresponding position of the signal trigger end of the transmission rod, through which the force transmission pin passes, is a kidney-shaped through groove, the diameter of the force transmission pin corresponds to the width of a groove of the kidney-shaped through groove, and the length direction of the groove of the kidney-shaped through groove is perpendicular to the axis of the transmission rod and the axis of the force transmission pin.
Further, the outer sleeve body comprises a sealing signal box, an upper sleeve and a lower sleeve which are sequentially connected along the axial direction of the transmission rod, the sealing signal box is of a cavity structure with one end being open and is in sealing buckling with the corresponding end of the upper sleeve through the open end of the sealing signal box, and the transmission rod is in sliding connection with the upper sleeve and the lower sleeve; the rotary induction block is positioned in the sealing signal box to ensure enough rotary space, the signal triggering end of the transmission rod extends into the sealing signal box to be connected with the rotary induction block, the end face of the upper sleeve facing the sealing signal box or the inner wall of the sealing signal box is fixedly connected with an induction block seat, and the rotary induction block is rotatably connected with the induction block seat through a rotary pin; the inductive sensor is connected to the sealed signal box.
Further, the return mechanism is a spiral pressure spring; the end face of the upper sleeve facing the lower sleeve is provided with a concave sinking table, the outer circumferential surface of the transmission rod is provided with a circle of flange, the sinking table is coaxial with the transmission rod and the inner diameter of the sinking table is larger than the outer diameter of the flange, the spiral pressure spring is sleeved on the transmission rod and compressed between the bottom surface of the sinking table and the flange, and the other end face of the flange is abutted against the end face of the lower sleeve facing the upper sleeve to serve as the initial setting position.
Further, a through constant pressure hole is formed in the side wall of the sinking table, a constant pressure groove is formed in the outer circumferential surface of the transmission rod section in the upper sleeve, and the constant pressure groove is used for communicating the constant pressure hole with the inner cavity of the sealing signal box.
Further, a lower sleeve extends out of the mechanical contact end of the transmission rod, and the mechanical contact end is of a hemispherical structure or is connected with a rolling bearing at the end of the transmission rod through a rotating pin; the side wall of the upper sleeve or the lower sleeve is connected with a rotation control bolt, the inner end of the rotation control bolt extends into a rotation control groove formed in the outer circumferential surface of the transmission rod, the rotation control groove is formed along the axial direction of the transmission rod and has a certain length so as to avoid interference with the axial movement of the transmission rod, and the part of the inner end of the rotation control bolt extending into the rotation control groove is of a light cylindrical structure, and the diameter of the inner end of the rotation control bolt corresponds to the width of a groove of the rotation control groove so as to play a role in preventing the rotation of the transmission rod.
The invention also relates to a connecting structure of the inductive signal detection device for the pump, which comprises a hydraulic chamber and the inductive signal detection device for the pump, wherein the outer sleeve body penetrates through the side wall of the hydraulic chamber and is in sealing connection with the side wall of the hydraulic chamber, the mechanical contact end of the transmission rod is positioned in the hydraulic chamber, the inductive sensor is positioned outside the hydraulic chamber, the hydraulic chamber is internally provided with a guide rod serving as a detected object, the guide rod reciprocates along the axial direction of the guide rod, and one end of the guide rod corresponds to the mechanical contact end so as to be in contact with the mechanical contact end of the transmission rod through the end and enable the transmission rod to move towards the signal trigger end of the transmission rod.
Further, the axis of the transmission rod is perpendicular to the axis of the guide rod; one end of the guide rod corresponding to the mechanical contact end is provided with a taper so as to contact with the mechanical contact end of the transmission rod through the taper and enable the transmission rod to move towards the signal trigger end of the transmission rod.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts a principle structure completely different from the existing detection principle to realize an electromechanical integrated control mode; the control principle and the device structure have the characteristics of true, reliable, accurate and timely signals, high repeatability precision and high sensitivity when detecting that a moving part reaches a specific position.
2. The invention belongs to a contact type electromechanical integrated position detection sensing device, which reduces the space structure size in the moving direction of a moving part and is more beneficial to the use of small structure space size.
3. The inductance type electric appliance element adopted by the invention belongs to an external part, is positioned outside, is convenient and quick in the operation and maintenance process, has low cost, is particularly in a high-temperature hydraulic medium environment, is more beneficial to heat dissipation of the electric appliance element, and further prolongs the service life.
4. The control principle and the device structure adopted by the invention are applicable to wider environments and ranges.
Drawings
FIG. 1-schematic diagram of the structure and connections of a prior art signal generator;
fig. 2-a schematic structural diagram of an inductive signal detection device for a pump according to the first embodiment;
FIG. 3-schematic view (2: 1 enlarged) of a cross section of a position of the transfer rod with the constant pressure groove and an alternative structure in the first embodiment;
fig. 4-a schematic structural diagram of an inductive signal detection device for a pump according to the second embodiment;
FIG. 5-schematic diagram of the connection structure of the rolling bearing at the mechanical contact end of the transfer rod in the second embodiment (2: 1 enlarged);
FIG. 6 is a schematic structural diagram of an inductive signal detection device for pump according to the third embodiment;
FIG. 7 is a schematic diagram showing a connection structure of an inductive signal detecting apparatus for a pump according to the fourth embodiment;
FIG. 8 is a schematic diagram showing a connection structure of an inductive signal detecting apparatus for a pump according to a fifth embodiment;
wherein, the upper cover 100 of the signal box, the magnetic ring 102, the glue 103, the bottom cover 105 of the signal box, the lower cover 106 of the signal box, the magnetic induction sensor 107, the pressure-bearing signal box 108,
the device comprises a guide rod 1, a rotating pin 2, a rolling bearing 3, a lower sleeve 4, a hydraulic chamber 5, a spiral pressure spring 6, an upper sleeve 7, a sinking table 71, a constant pressure hole 72, a transmission rod 8, a signal trigger end 81, a mechanical contact end 82, a flange 83, a constant pressure groove 84, a flat square 85, a waist-shaped through groove 86, a rotating groove 87, a force transmission pin 9, a sealing signal box 10, a rotary induction block 11, a trigger end face 111, a deflation valve 12, an inductive sensor 13, a sensor seat 14, a sealant 15, an induction block seat 16, a rotary pin 17, a rotary bolt 18 and a taper 19.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Example 1
Referring to fig. 2, the inductive signal detection device for a pump according to the first embodiment includes an outer casing, in which a transmission rod 8 is slidably connected, one end of the transmission rod 8 is a signal trigger end 81, and the other end is a mechanical contact end 82 for contacting with a measured object and moving the transmission rod 8 axially toward the signal trigger end 81 thereof; the outer sleeve body is provided with an inductive sensor 13 corresponding to the signal trigger end 81 so as to trigger the inductive sensor 13 when the transmission rod 8 moves towards the signal trigger end 81 along the axial direction; a return mechanism is provided between the outer casing and the transfer lever 8 to maintain the transfer lever 8 in an initial set position of the non-triggering inductive sensor 13 when its mechanical contact end 82 is not in contact with the object to be measured. The outer sleeve body comprises a sealing signal box 10, an upper sleeve 7 and a lower sleeve 4 which are sequentially connected along the axial direction of a transmission rod 8, wherein the sealing signal box 10 is of a cavity structure with one end being open and is in sealing buckling with the corresponding end of the upper sleeve 7 through the open end of the sealing signal box, the sealing signal box is connected with the upper sleeve 7 through bolts, the bolts penetrate through the side wall of the sealing signal box 10 to be in threaded connection with the upper sleeve 7, the lower sleeve 4 is connected with the other end of the upper sleeve 7 and is connected with the upper sleeve 7 through a plurality of bolts uniformly distributed by taking the axis of the transmission rod 8 as the center, and the bolts penetrate through the side wall of the lower sleeve 4 to be in threaded connection with the upper sleeve 7; the transmission rod 8 is slidably matched in the upper sleeve 7 and the lower sleeve 4; the signal trigger end 81 of the transmission rod 8 extends into the sealing signal box 10, the inductive sensor 13 is connected to the sealing signal box 10 through the sensor seat 14, and the axis of the inductive sensor is intersected with and perpendicular to the axis of the transmission rod 8; the two ends of the sensor seat 14 are adhered with an inductance sensor 13 by using an oil-resistant and temperature-resistant sealant 15; the sealing signal box 10 is also provided with a release valve 12; the return mechanism is a spiral pressure spring 6; the end face of the upper sleeve 7 facing the lower sleeve 4 is provided with a concave sinking platform 71, the outer circumferential surface of the transmission rod 8 is provided with a circle of flange 83, the sinking platform 71 is coaxial with the transmission rod 8 and the inner diameter of the sinking platform is larger than the outer diameter of the flange 83, the spiral pressure spring 6 is sleeved on the transmission rod 8 and compressed between the bottom surface of the sinking platform 71 and the flange 83, the other end face of the flange 83 is abutted with the end face of the lower sleeve 4 facing the upper sleeve 7 under the acting force of the spiral pressure spring 6 to serve as the initial setting position, in the embodiment, the end face of the lower sleeve 4 facing the upper sleeve 7 is also provided with a circle of annular boss in a protruding mode and extending into the sinking platform 71, the flange 83 is abutted with the annular boss, and the annular boss is used for positioning during assembly so as to ensure the coaxiality of the inner holes of the upper sleeve 7 and the lower sleeve 4. The side wall of the sinking table 71 is provided with a through constant pressure hole 72, the outer circumferential surface of the section of the transmission rod 8 in the upper sleeve 7 is provided with a constant pressure groove 84, and the constant pressure groove 84 is provided along the axial direction of the transmission rod 8 and communicates the constant pressure hole 72 with the inner cavity of the sealing signal box 10. In the embodiment, under the condition of ensuring the strength of the upper sleeve 7, the plurality of balance pressure holes 72 can be arranged, the communication between the balance pressure holes 72 and the inner cavity of the sealing signal box 10 is realized through gaps between the inner wall of the upper sleeve 7 and the sections of the transmission rod 8 in the upper sleeve 7, and a degassing mode can be adopted, for example, in the embodiment, the outer diameter of the sections of the transmission rod 8 is smaller than the inner diameter of the upper sleeve 7 to reduce the grooving length of the balance pressure groove 84, the outer diameter of the sections of the transmission rod 8 is reserved to correspond to the inner diameter of the upper sleeve 7 to ensure the positioning and sliding guiding effects, meanwhile, the sliding friction force can be reduced, the number of the balance pressure grooves 84 can be a plurality of equal-distributed balance pressure grooves, the form of the balance pressure grooves 84 can be replaced by the form of flat square grooves 85, and the two functional effects of ensuring the positioning guiding and the communication by the gaps can be realized only by the circular arc sections, as shown in fig. 3. The mechanical contact end 82 of the transmission rod 8 extends out of the lower sleeve 4, and the mechanical contact end 82 is of a hemispherical structure.
Example two
Referring to fig. 4 and 5, the second embodiment is further optimized based on the first embodiment.
The signal trigger end of the transfer lever 8 is connected with a displacement amplification mechanism to trigger the inductive sensor 13 through the displacement amplification mechanism when the transfer lever 8 moves toward the signal trigger end 81 thereof; the displacement amplifying mechanism comprises a rotary sensing block 11, wherein the rotary sensing block 11 is positioned in a sealed signal box 10 to ensure enough rotary space, the rotary sensing block 11 is rotatably connected with a signal trigger end 81 of a transmission rod 8 through a force transmission pin 9, the rotary sensing block 11 is rotatably connected with the sealed signal box 10 through a rotary pin 17 and takes the rotary pin 17 as a rotary center, the axis of the force transmission pin 9 is perpendicular to the axis of the transmission rod 8, and the axes of the force transmission pin 9 and the rotary pin 17 are mutually parallel so that the rotary sensing block 11 can rotate by taking the rotary pin 17 as the rotary center through the force transmission pin 9 when the transmission rod 8 axially moves; the rotary sensing block 11 is provided with a trigger end face 111, and the vertical distance from the trigger end face 111 to the rotary pin 17 is larger than the vertical distance from the force transmission pin 9 to the rotary pin 17 so as to ensure the amplifying effect; the inductive sensor 13 corresponds to the triggering end face 111 of the rotary sensing block 11 to be triggered when the triggering end face 111 enters its sensing area, in this embodiment, the axis of the inductive sensor 13 is parallel to the axis of the transfer rod 8 and intersects the axis of the rotary pin 17. The triggering end face 111 is a cylindrical surface so that the triggering distance of the rotary sensing block 11 is consistent in the process of rotation triggering, namely the distance from the surface to the inductive sensor 13 is consistent, a straight generatrix of the cylindrical surface is parallel to the axis of the rotary pin 17, a quasi-line of the cylindrical surface is a section of circular arc, and the center of the circular arc is on the axis of the rotary pin 17. The corresponding position of the signal trigger end 81 of the transfer rod 8 penetrated by the force transmission pin 9 is a kidney-shaped through groove 86, the diameter of the force transmission pin 9 corresponds to the grooved groove width of the kidney-shaped through groove 86, the grooved length direction of the kidney-shaped through groove 86 is perpendicular to the axis of the transfer rod 8 and the axis of the force transmission pin 9, the kidney-shaped through groove 86 can ensure the rotatability of the rotary sensing block 11, and meanwhile, the diameter of the force transmission pin 9 corresponds to the grooved groove width of the kidney-shaped through groove 86, so that the timeliness of the axial movement of the transfer rod 8 is converted into the rotation of the rotary sensing block 11 can be ensured.
The mechanical contact end of the transmission rod 8 is a rolling bearing 3 connected to the end of the transmission rod 8 through a rotating pin 2, and the axes of the transmission rods 8 of the rolling bearing 3 are intersected and mutually perpendicular; the side wall of the lower sleeve 4 is connected with a rotation control bolt 18, the inner end of the rotation control bolt 18 extends into a rotation control groove 87 formed in the outer circumferential surface of the transmission rod 8, the rotation control groove 87 is formed along the axial direction of the transmission rod 8 and has a certain length so as to avoid interference with the axial movement of the transmission rod 8, the part of the inner end of the rotation control bolt 18 extending into the rotation control groove 87 is of a light cylindrical structure, the diameter of the part corresponds to the width of a groove of the rotation control groove 87 so as to play a role in preventing the rotation of the transmission rod 8, and a certain gap is formed between the end face of the inner end of the rotation control bolt 18 and the bottom surface of the rotation control groove 87 so as to avoid interference with the axial movement of the transmission rod 8. In practice, the rotation-making bolt 18 and the rotation-making groove 87 may be provided on the side wall of the upper case 7 and the section of the transmission rod 8 in the upper case 7, and the same effect is achieved. The function of the rotation bolt 18 and the rotation groove 87 is to ensure the angular relationship between the rolling bearing 3 and the measured object, and the angular relationship between the kidney-shaped through groove 86 and the force transmission pin 9, so as to ensure that the corresponding functional effects can be achieved.
Example III
Referring to fig. 6, the third embodiment is further optimized based on the second embodiment.
In order to facilitate connection and reduce the sealing workload, an induction block seat 16 is fixedly connected to the end face of the upper sleeve 7 facing the sealing signal box 10, and the rotary induction block 11 is rotatably connected with the induction block seat 16 through a rotary pin 17; in this way, the length of the pivot pin 17 can be reduced and it is not necessary to attach to the wall of the sealed signal box 10, facilitating attachment and not affecting sealing performance. In practice, the sensing block seat 16 may be fixedly connected to the inner wall of the sealing signal box 10, and the same effect is achieved.
The connection form of the rotary sensing block 11 is similar to the connection form of the transmission rod 8 and the rolling bearing 3 in fig. 5, namely, two side wings extend from the lower part of the rotary sensing block 11, the signal trigger end of the transmission rod 8 and the rotary sensing block 11 are positioned between the two side wings, and the force transmission pin 9 and the rotary pin 17 are correspondingly penetrated.
The invention also provides a connecting structure of the inductive signal detection device for the pump.
Example IV
Referring to fig. 2 and 7, in the connection structure of the inductive signal detection device for a pump according to the first embodiment, the upper sleeve 7 of the inductive signal detection device for a pump passes through the side wall of the hydraulic chamber 5 and is connected with the side wall of the hydraulic chamber 5 in a sealing manner, the mechanical contact end 82 and the balance hole 72 of the transmission rod 8 are located in the hydraulic chamber 5, the signal trigger end 81 and the inductive sensor 13 of the transmission rod 8 are located outside the hydraulic chamber 5, the hydraulic chamber 5 is internally provided with a guide rod 1 as a measured object, the guide rod 1 reciprocates along the axial direction thereof, and one end of the guide rod 1 corresponds to the mechanical contact end 82 to contact the mechanical contact end 82 of the transmission rod 8 through the end and move the transmission rod 8 towards the signal trigger end 81 thereof.
When the device is applied, a hydraulic medium enters the sealing signal box 10 through the constant pressure hole 72 and the constant pressure groove 84, so that the pressure at two ends of the transmission rod 8 is balanced, the transmission rod 8 is prevented from receiving unidirectional pressure, namely, the pressure towards the signal trigger end 81 of the transmission rod, the flexibility and the reliability of the movement of the transmission rod 8 can be ensured, the requirement on a return mechanism is reduced, the spring force of the spiral pressure spring 6 is not required to be too large, and the structural requirement and the space requirement are simplified. When the hydraulic medium is installed, the hydraulic medium enters the sealing signal box 10 through the constant pressure hole 72 and the constant pressure groove 84, and is deflated through the deflating valve 12, so that the hydraulic medium is ensured to fill the inner space of the sealing signal box 10, and the constant pressure effect is ensured.
Example five
Referring to fig. 6 and 8, in the present embodiment, the inductive signal detection device for pump according to the third embodiment is adopted, and the construction of the hydraulic chamber 5 is possibly different, and the fifth embodiment is different from the fourth embodiment in that the axis of the transmission rod 8 and the axis of the guide rod 1 are intersected and perpendicular to each other; the end of the guide rod 1 corresponding to the mechanical contact end 82 is provided with a taper 19 to contact the mechanical contact end 82 of the transmission rod 8 through the taper 19 and move the transmission rod 8 toward the signal trigger end 81 thereof. This construction of the hydraulic chamber 5 and the guide bar 1 is most common in practical applications, and the present construction is effective to convert the reciprocating motion of the guide rail into an axial movement of the transfer bar 8 in a vertical direction.
When the guide rod 1 moves to the left in the drawing, the rolling bearing 3 rolls on the face of the guide rod 1 with the taper 19, converting the reciprocating motion of the guide rod 1 into the vertical motion of the transmission rod 8. Because the structure is purely mechanical motion conversion, the condition of detecting the change and instability of the contact position during each motion does not exist, the contact position is a fixed design value point, and the detection of the motion position of the guide rod 1 is more stable and reliable.
When the transmission rod 8 moves upwards, the rotary induction block 11 is driven to rotate clockwise along the direction of illustration, so that the rotary induction block 11 enters an induction area of the inductive sensor 13, and a specific position signal of the guide rod 1 is timely and accurately detected. In addition, the rotary sensing block 11 is a position amplifying mechanism, so that the guide rod 1 can drive the trigger end face 111 of the rotary sensing block 11 to enter the sensing area of the inductive sensor 13 only by slight movement change to the left in the drawing, and the sensitivity is high; due to the existence of the spiral pressure spring 6, once the guide rod 1 is separated from the rolling bearing 3, the transmission rod 8 immediately drives the rotary induction block 11 to leave the induction area, so that the real situation of the specific position of the guide rod 1 can be timely and accurately reflected; the detection trigger is also more timely and accurate.
The inductive sensor 13 is applied to a high-temperature high-pressure hydraulic oil system, belongs to a mature reliable product, is not influenced by an environmental magnetic field, is only related to the distance between the rotary induction block 11 and the inductive sensor 13, is fixed in design, further ensures consistency in the movement process through a cylindrical surface form, does not change along with the change of the environment, and further ensures the triggering reliability.
The structure of the invention is contact type, the induction can be transmitted and triggered only when the guide rod 1 is contacted with the rolling bearing 3, and the induction is not needed to be larger like 'magnetic induction', so that the structure size can be reduced in the moving direction of the guide rod 1.
The inductance type sensor 13 belongs to the external device, and the whole device only belongs to the electric elements, the other parts belong to the mechanical parts, and the mechanical parts are not influenced by the working condition environment, so that the reliability is higher, the inductance type sensor 13 is used as a wearing part and arranged outside the hydraulic chamber 5, the service life can be prolonged, and the device is more convenient and quick to replace and has low maintenance cost.
The principle of the device for realizing the detection of the specific position of the guide rod 1 is essentially different from the prior art, and the applicable environment and working condition range of the device are wider than those of the prior art, and the limitation is smaller.
In the prior art, the magnetic ring forms a magnetic field space similar to a sphere, so that the induction distance is large and unstable, while the induction area of the inductive sensor 13 in the structure is a cylindrical area, and only the triggering end face 111 of the rotary induction block 11 is positioned right below the cylindrical area, so that the induction distance is almost negligible, and the detection accuracy and the authenticity of the fed-back guide rail position are improved.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (4)
1. Inductive signal detection device for pump, its characterized in that: the device comprises an outer sleeve body, wherein a transmission rod is slidably connected in the outer sleeve body, one end of the transmission rod is a signal trigger end, and the other end of the transmission rod is a mechanical contact end which is used for contacting with a tested object and enabling the transmission rod to move towards the signal trigger end; the outer sleeve body is provided with an inductive sensor corresponding to the signal trigger end so as to trigger the inductive sensor when the transmission rod moves towards the signal trigger end; a return mechanism is arranged between the outer sleeve body and the transfer rod so that the transfer rod is kept at an initial setting position of the non-triggered inductive sensor when the mechanical contact end of the transfer rod is not contacted with the measured object;
the signal triggering end of the transmission rod is connected with a displacement amplifying mechanism so as to trigger the inductive sensor through the displacement amplifying mechanism when the transmission rod moves towards the signal triggering end of the transmission rod; the displacement amplifying mechanism comprises a rotary induction block, the rotary induction block is rotatably connected with a signal trigger end of the transmission rod through a force transmission pin, the rotary induction block is rotatably connected with the outer sleeve body through a rotary pin, the axis of the force transmission pin is perpendicular to the axis of the transmission rod, and the force transmission pin and the axis of the rotary pin are mutually parallel so that the rotary induction block can rotate by taking the rotary pin as a rotary center through the force transmission pin when the transmission rod axially moves; the rotary sensing block is provided with a triggering end face, and the vertical distance from the triggering end face to the rotary pin is larger than the vertical distance from the force transmission pin to the rotary pin; the inductive sensor corresponds to the triggering end face of the rotary sensing block so as to be triggered when the triggering end face enters the sensing area of the inductive sensor;
the triggering end face is a cylindrical surface so that the triggering distance of the rotary sensing block is consistent in the rotation triggering process;
the corresponding position of the signal trigger end of the transmission rod, through which the force transmission pin passes, is a kidney-shaped through groove, the diameter of the force transmission pin corresponds to the width of a slotting groove of the kidney-shaped through groove, and the slotting length direction of the kidney-shaped through groove is perpendicular to the axis of the transmission rod and the axis of the force transmission pin;
the outer sleeve body comprises a sealing signal box, an upper sleeve and a lower sleeve which are sequentially connected along the axial direction of the transmission rod, the sealing signal box is of a cavity structure with one end being open and is in sealing buckling with the corresponding end of the upper sleeve through the open end of the sealing signal box, and the transmission rod is in sliding connection with the upper sleeve and the lower sleeve; the rotary induction block is positioned in the sealing signal box to ensure enough rotary space, the signal triggering end of the transmission rod extends into the sealing signal box to be connected with the rotary induction block, the end face of the upper sleeve facing the sealing signal box or the inner wall of the sealing signal box is fixedly connected with an induction block seat, and the rotary induction block is rotatably connected with the induction block seat through a rotary pin; the inductive sensor is connected to the sealing signal box;
the return mechanism is a spiral pressure spring; the end face of the upper sleeve facing the lower sleeve is provided with a concave sinking table, the outer circumferential surface of the transmission rod is provided with a circle of flange, the sinking table is coaxial with the transmission rod, the inner diameter of the sinking table is larger than the outer diameter of the flange, the spiral pressure spring is sleeved on the transmission rod and compressed between the bottom surface of the sinking table and the flange, and the other end face of the flange is abutted against the end face of the lower sleeve facing the upper sleeve to serve as the initial setting position;
the side wall of the sinking table is provided with a through constant pressure hole, the outer circumferential surface of the transmission rod section in the upper sleeve is provided with a constant pressure groove, and the constant pressure groove is used for communicating the constant pressure hole with the inner cavity of the sealing signal box.
2. The inductive signal detection device for a pump of claim 1, wherein: the mechanical contact end of the transmission rod extends out of the lower sleeve, and the mechanical contact end is of a hemispherical structure or a rolling bearing connected to the end of the transmission rod through a rotating pin; the side wall of the upper sleeve or the lower sleeve is connected with a rotation control bolt, the inner end of the rotation control bolt extends into a rotation control groove formed in the outer circumferential surface of the transmission rod, the rotation control groove is formed along the axial direction of the transmission rod and has a certain length so as to avoid interference with the axial movement of the transmission rod, and the part of the inner end of the rotation control bolt extending into the rotation control groove is of a light cylindrical structure, and the diameter of the inner end of the rotation control bolt corresponds to the width of a groove of the rotation control groove so as to play a role in preventing the rotation of the transmission rod.
3. Connection structure of inductance type signal detection device for pump, its characterized in that: the inductive signal detection device for the pump comprises a hydraulic chamber and the inductive signal detection device for the pump according to claim 1 or 2, wherein an outer sleeve body penetrates through the side wall of the hydraulic chamber and is in sealing connection with the side wall of the hydraulic chamber, a mechanical contact end of a transmission rod is positioned in the hydraulic chamber, an inductive sensor is positioned outside the hydraulic chamber, a guide rod serving as a detected object is arranged in the hydraulic chamber, the guide rod reciprocates along the axial direction of the guide rod, and one end of the guide rod corresponds to the mechanical contact end so as to be in contact with the mechanical contact end of the transmission rod through the end and enable the transmission rod to move towards the signal triggering end of the transmission rod.
4. A connection structure of an inductive signal detecting apparatus for a pump according to claim 3, wherein: the axis of the transmission rod is perpendicular to the axis of the guide rod; one end of the guide rod corresponding to the mechanical contact end is provided with a taper so as to contact with the mechanical contact end of the transmission rod through the taper and enable the transmission rod to move towards the signal trigger end of the transmission rod.
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| CN201910204965.5A CN109763973B (en) | 2019-03-18 | 2019-03-18 | Inductive signal detection device for pump and connection structure thereof |
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| CN201910204965.5A CN109763973B (en) | 2019-03-18 | 2019-03-18 | Inductive signal detection device for pump and connection structure thereof |
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| CN109763973B true CN109763973B (en) | 2024-01-23 |
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| CN115163461A (en) * | 2022-08-26 | 2022-10-11 | 重庆水泵厂有限责任公司 | Diaphragm pump and accurate oil supply and discharge control method for diaphragm pump |
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| JPH07243488A (en) * | 1994-03-09 | 1995-09-19 | Nissan Motor Co Ltd | V-belt type continuously variable transmission |
| JPH08145153A (en) * | 1994-11-18 | 1996-06-04 | Hino Motors Ltd | Transmission |
| CN2230439Y (en) * | 1995-05-29 | 1996-07-03 | 倪山 | Enlarging-detecting device for gap displacement of rod |
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