CN107453534B - Electric push rod for solar photo-thermal power generation - Google Patents
Electric push rod for solar photo-thermal power generation Download PDFInfo
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- CN107453534B CN107453534B CN201710490944.5A CN201710490944A CN107453534B CN 107453534 B CN107453534 B CN 107453534B CN 201710490944 A CN201710490944 A CN 201710490944A CN 107453534 B CN107453534 B CN 107453534B
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- 238000009423 ventilation Methods 0.000 claims abstract description 24
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- 239000002184 metal Substances 0.000 claims description 8
- 238000007667 floating Methods 0.000 claims description 5
- 239000000565 sealant Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 28
- 230000005540 biological transmission Effects 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 description 11
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- 238000005265 energy consumption Methods 0.000 description 5
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0072—Electrical cables comprising fluid supply conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
- H02K7/1021—Magnetically influenced friction brakes
- H02K7/1023—Magnetically influenced friction brakes using electromagnets
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Photovoltaic Devices (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention discloses an electric push rod for solar photo-thermal power generation, which belongs to the technical field of linear driving, wherein a motor is arranged in the electric push rod, a transmission screw is connected with the motor in a transmission way, a nut is driven to axially move relative to the transmission screw when the transmission screw rotates, the motor is particularly connected with a cable wire, the cable wire stretches out of the electric push rod, the cable wire comprises a sheath, and a ventilation channel which is communicated with the inside of the electric push rod and the outside of the electric push rod is arranged in the sheath. The invention has the advantages of ensuring the waterproof and dustproof effects of the electric push rod and solving the problem that negative pressure is easy to generate in the electric push rod.
Description
[ field of technology ]
The invention relates to an electric push rod for solar photo-thermal power generation, and belongs to the technical field of linear transmission.
[ background Art ]
The main working principle of the electric push rod, generally called a linear actuator, is that a motor drives a transmission screw to rotate, a nut is arranged on the transmission screw, and the transmission screw drives the nut to reciprocate when rotating.
With the development of solar technology, the solar photo-thermal power generation technology is an emerging solar energy utilization technology after photovoltaic power generation, and the principle is that a large number of heliostats are used for focusing the energy of direct solar light, and tower type collection is generally adopted for collecting the energy, wherein the effect of the heliostats is critical, and in order to improve the efficiency of the heliostats for reflecting sunlight, an electric push rod is already applied to be used as a driving device of the heliostats.
The electric push rod is used in the solar photo-thermal power generation field, because the environment of use is in the outdoor severe environment, corrosion of rainwater, frost and sand dust needs to be avoided, the electric push rod is required to be provided with a very good sealing structure, but the sealing structure is too good, and the problem is also solved that the nut of the electric push rod reciprocates in the electric push rod and is similar to a piston to reciprocate in a needle cylinder, if the whole needle cylinder has very good tightness, a negative pressure effect can be generated in the needle cylinder, the resistance to reciprocate of the piston is very high, and similarly, the sealing performance of the electric push rod is very good, the piston reciprocates in the electric push rod can generate negative pressure in the electric push rod, so that the resistance to reciprocate of the nut is increased, the energy consumption for driving the nut to reciprocate is increased, so that the scheme of how to ensure that the negative pressure is not generated in the electric push rod is researched, and waterproof and dustproof can be urgently needed.
[ invention ]
The invention aims to solve the technical problems of overcoming the defects of the prior art and providing the electric push rod for solar photo-thermal power generation, which not only ensures the waterproof and dustproof effects of the electric push rod, but also can solve the problem that negative pressure is easy to generate inside the electric push rod.
The technical problems are solved, and the invention adopts the following technical scheme:
the utility model provides a solar energy is electric putter for photo-thermal power generation, be equipped with the motor in the electric putter, motor drive is connected with drive screw, drives the nut when drive screw rotates for drive screw axial displacement, its special the motor is connected with the cable conductor, the cable conductor stretches out outside the electric putter, the cable conductor includes the sheath, be equipped with in the sheath intercommunication inside the electric putter with the outside passageway of ventilating of electric putter.
Preferably, a hollow catheter or a metal mesh tube is arranged in the sheath, and the inner cavity of the hollow catheter or the metal mesh tube forms the ventilation channel.
Preferably, the hollow conduit or the expanded metal tube has an inner diameter of 1mm to 15mm.
Preferably, a core wire is arranged in the sheath, the core wire comprises a core wire sleeve, a convex rib is arranged outside the core wire sleeve, a gap is formed between adjacent core wires or between the core wires and the sheath by the convex rib, and the gap forms the ventilation channel.
Preferably, a filler is provided in the sheath.
Preferably, the part of the cable positioned in the electric push rod is a cable inner section, and the cable inner section is provided with a first side opening for communicating with the ventilation channel; and/or the part of the cable extending out of the electric push rod is a cable outer section, and a second side opening used for communicating the ventilation channel is formed in the cable outer section.
Preferably, the driving screw drives the nut to reciprocate between an initial position and a limit position, the electric push rod further comprises a photoelectric sensor and a touch plate for triggering the photoelectric sensor, and the nut drives the touch plate to move towards the photoelectric sensor when returning to the initial position.
Preferably, the electric push rod further comprises a fixing seat, the fixing seat and the transmission screw rod are fixed at the axial retaining position, and the photoelectric sensor is mounted on the fixing seat.
Preferably, the fixing seat is provided with a containing cavity, the photoelectric sensor is installed in the containing cavity, the containing cavity is provided with a first opening, and the touch plate comprises a triggering lug which can extend into the containing cavity through the first opening.
Preferably, a soft sealing sleeve is arranged at the first opening, and the triggering lug can penetrate through the soft sealing sleeve and extend into the accommodating cavity; and/or the accommodating cavity is provided with a second opening, the photoelectric sensor is arranged in the accommodating cavity through the second opening, and sealant is arranged at the second opening.
Preferably, the motor is connected with a motor brake device, and the motor brake device comprises:
The fixed seat is fixedly arranged on the motor;
the connecting shaft is fixedly connected with a motor shaft of the motor or is of an integral structure:
the brake block rotates along with the connecting shaft in the rotation direction and is in floating connection with the connecting shaft in the axial direction:
an electromagnet mounted in the fixed seat;
in the working state, an avoidance gap is reserved between the brake pad and the fixed seat, and in the braking state, the electromagnet drives the brake pad to float under the action of magnetic force and is attracted to the fixed seat.
Preferably, a fixed disc is arranged on the connecting shaft, the fixed disc synchronously rotates along with the connecting shaft, and an elastic resetting piece is arranged between the fixed disc and the brake pad.
Preferably, the fixed disk is axially movable relative to the connecting shaft and is positioned on the connecting shaft by a fastener.
Preferably, the electromagnet comprises an inner ring, a coil and a magnet, wherein the inner ring is sleeved on the connecting shaft, the coil is wound outside the inner ring, and the magnet is arranged at the end part of the coil; or, the electromagnet comprises a magnetic core and a coil wound outside the magnetic core, and the magnetic core is sleeved on the connecting shaft.
The beneficial effects of the invention are that:
the electric push rod has the advantages that the original sealing structure on the electric push rod can be not changed, good sealing performance is still ensured, the electric push rod is used for preventing outdoor rainwater, frost, sand dust and the like from corroding the inside of the electric push rod, meanwhile, in order to solve the negative pressure problem inside the electric push rod, the electric cable is improved, because the power output of the electric push rod comes from a motor, the motor needs a power supply, the cable is needed by the power supply, the traditional cable is solid even if the traditional cable is not completely solid, the gap between internal core wires is very small, and the ventilation effect cannot be realized.
The cable of the invention is internally provided with the ventilation channel, one end of the cable is connected to the motor inside the electric push rod, the other end of the cable is connected to an external power box or other power supply equipment, and the power box or other power supply equipment is communicated with the outside atmosphere, so that the internal air pressure of the electric push rod is communicated with the outside air pressure through the cable, and the power supply equipment such as the power box is generally provided with corresponding waterproof and dustproof measures, so that rainwater and the like can not enter the electric push rod from the ventilation channel of the cable, thereby well solving the problem of negative pressure inside the electric push rod.
Firstly, the most intuitive effect is that the resistance of the nut in reciprocating motion is greatly reduced, so that the energy consumption loss of the electric push rod is reduced.
Secondly, the problem of negative pressure is solved, not only the problem that the reciprocating motion of the nut is resisted is reduced, but also other unexpected effects can be achieved:
1. the traditional electric putter who uses at solar energy photo-thermal technology, though set up seal structure, but because electric putter sets up under open air environment, if the adjacent foreign matter such as adhering to rainwater of seal structure, frost, sand dust, when the push rod takes place to stretch out and draw back, because external atmosphere is greater than the inside atmospheric pressure of electric putter, such rainwater, frost, sand dust and other foreign matter can be by the back-draught into electric putter's inside, so even if seal structure has been set up, still there is the problem that the foreign matter got into electric putter, and after having solved the negative pressure problem, electric putter is when stretching out and draw back, its inside atmospheric pressure is unanimous with outside atmospheric pressure, can guarantee at least that the phenomenon of back-draught no longer takes place, reduce the hidden danger that the foreign matter got into electric putter inside.
2. The traditional electric push rod applied to the solar photo-thermal technology has the working environment temperature of minus 30 ℃ to 70 ℃, so that under the extreme severe environment, the temperature difference between day and night is 70 ℃ and minus 30 ℃ and reaches 100 ℃, under the condition, the pressure inside the electric push rod is greatly different from the pressure outside through 100 ℃ of temperature difference change inside the sealed electric push rod, and under the action of atmospheric pressure, the load of the sealing structure is very large, the ageing procedure is aggravated, and the service life of the sealing structure is influenced. After the negative pressure problem is solved, even though the temperature difference of 100 ℃ is carried out day and night, the pressure intensity of the inside and the pressure intensity of the outside of the push rod can be kept consistent, at least the burden on a sealing structure caused by inconsistent internal and external pressure intensity can be greatly reduced, and the service life of the electric push rod is prolonged.
In other preferred embodiments, the following benefits are also provided:
the invention improves the traditional contact limit switch into a photoelectric sensor, wherein the photoelectric sensor adopts a photoelectric element as a sensor of a detection element, firstly, the measured change is converted into the change of an optical signal, then the optical signal is further converted into an electric signal by the photoelectric element, and in addition, the invention also provides a touch plate which is driven to move towards the photoelectric sensor when the nut returns to the initial position.
Secondly, the photoelectric sensor is basically non-contact, namely the touch plate does not need to be contacted with the photoelectric sensor, so that acting force and abrasion between the touch plate and the photoelectric sensor can not occur, the problem of error enlargement can not be caused after long-term use, and the precision can be always ensured as early as possible.
After guaranteeing in the precision for the zeroing position at every turn of nut is accurate, so when control system carries out control propulsion to electric putter, can guarantee that electric putter's relative flexible precision is better, thereby can realize heliostat effect accurately, thereby let the solar energy of heliostat reflection reflect to the acquisition tower accurately.
In addition, in the preferred scheme, the motor braking device is improved, an avoidance gap is reserved between the brake pad and the fixed seat under the normal working condition, and due to the avoidance gap, no friction effect exists between the brake pad and the fixed seat, and the brake pad rotates along with the connecting shaft, namely, no friction effect exists between the connecting shaft and the fixed seat, in other words, the resistance effect on the motor shaft is basically zero, so that the motor is basically free of resistance effect on the motor under the normal working state, the heating problem is avoided, meanwhile, the brake pad is not contacted with the fixed seat under the normal working state, the mutual abrasion time is short, the service life is longer, and the motor braking device is applied to an electric push rod in the technical field of solar photo-thermal power generation, and can ensure longer service life and less required energy consumption of the electric push rod.
Under the condition that a motor is required to be braked, the electromagnet generates floating through the magnetic force action, so that the brake pad is attracted to the fixed seat, the working principle of the electromagnet is to generate magnetic force through switching on and off, in the invention, the magnetic force is used for controlling the floating of the brake pad, the brake pad is attracted to the fixed seat, friction force is generated between the brake pad and the fixed seat, the brake pad is subjected to resistance, the rotating speed is reduced, so that the rotating speed of the connecting shaft is correspondingly reduced, the braking effect of the motor is achieved, the electric push rod is applied to the electric push rod, particularly the electric push rod in the technical field of solar photo-thermal power generation, the braking force of the electric push rod is more stable when the electric push rod is retracted and the braking force is controlled by switching on and off, and the electric push rod is also in accordance with the technical field of solar photo-thermal power generation.
In addition, because the braking is electrically controlled, the transmitted torsion spring braking is realized by depending on different rotation directions of the motor shaft, and the electric push rod can realize the braking of the motor no matter the motor shaft is in a forward rotation state or a reverse rotation state.
Other features and advantages of the present invention will be disclosed in the following detailed description of the invention and the accompanying drawings.
[ description of the drawings ]
The invention is further described with reference to the accompanying drawings:
FIG. 1 is a schematic view of an electric putter according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a cable according to a first embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a cable in a first embodiment of the present invention;
FIG. 4 is an exploded view of a first embodiment of the electric putter of the present invention;
FIG. 5 is a schematic view of a first embodiment of an electric putter in accordance with the present invention;
FIG. 6 is a schematic diagram illustrating an assembly of a touch pad and a fixing base in a first embodiment of an electric putter according to the present invention;
FIG. 7 is an exploded view of the touch panel and the holder of the electric putter according to the first embodiment of the present invention;
FIG. 8 is a schematic view of an end face of a fixing seat in a first embodiment of the electric putter of the present invention;
FIG. 9 is a schematic cross-sectional view taken along line A-A of FIG. 8;
FIG. 10 is a schematic cross-sectional view taken in the direction B-B of FIG. 8;
FIG. 11 is a schematic view of a touch panel in a first embodiment of an electric putter according to the present invention;
FIG. 12 is a schematic view of a motor brake device in a first embodiment of an electric putter in accordance with the present invention;
FIG. 13 is a schematic cross-sectional view of a motor brake device in a first embodiment of the electric putter of the present invention;
FIG. 14 is a schematic view of an end face of a motor brake device in a first embodiment of an electric putter in accordance with the present invention;
FIG. 15 is a schematic view of a leaf spring in a first embodiment of the electric putter of the present invention;
fig. 16 is a schematic cross-sectional view of a cable in a second embodiment of the electric putter of the present invention.
[ detailed description ] of the invention
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
In the following description, the terms such as "inner", "outer", "upper", "lower", "left", "right", etc. are used to indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description of the embodiments and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1:
as shown in fig. 1 to 15, the electric push rod for solar photo-thermal power generation shown in this embodiment is mainly preferably used in solar photo-thermal power generation technology, drives heliostats for use, and has a main structure including a motor 10, a drive screw 11 connected to the motor 10 in a driving manner, a nut 12 connected to the drive screw 11, the motor 10 installed in a base 13, an outer tube 14 fixedly connected to the base 13, and an inner tube 15 fixedly connected to the nut 12, wherein when the motor 10 drives the drive screw 11 to rotate, the nut 12 and the drive screw 11 move relatively, specifically reciprocate between two positions on the drive screw 11, for the nut 12, between an initial position and a limit position. For the whole, the inner tube 15 and the outer tube 14 are relatively moved, and the outermost end of the inner tube 15 is used for driving the heliostat to rotate.
The electric push rod applied to the solar photo-thermal power generation field has a very good sealing structure because the electric push rod is used in an outdoor severe environment and needs to avoid erosion of rainwater, frost and sand dust.
In the electric putter in this embodiment, original seal structure on the electric putter can not change, still guarantees fine leakproofness, be used for preventing that open-air rainwater, frost, dust etc. from corroding to the electric putter inside, simultaneously, in order to solve the inside negative pressure difficult problem of electric putter, this embodiment has improved the cable conductor 2 of motor 10, because the power take off of electric putter comes from motor 10, and motor 10 needs there is the power, there is the power just needs the cable conductor, traditional cable conductor is solid even if not totally solid, the clearance between its inside heart yearn 23 is also very little, can not realize ventilation effect.
The cable 2 in this embodiment has a ventilation channel 201 inside, one end of the cable 2 is connected to the motor 10 inside the electric push rod, the other end extends out of the electric push rod and is connected to an external power box or other power supply equipment, and the power box or other power supply equipment is equivalent to being communicated with the outside air, so that the internal air pressure of the electric push rod is equivalent to being communicated with the outside air pressure through the cable 2, and since the power supply equipment such as the power box is generally provided with corresponding waterproof and dustproof measures, rainwater and the like cannot enter the electric push rod from the ventilation channel 201 of the cable 2, thereby well solving the problem of negative pressure inside the electric push rod.
First, the most intuitive effect is to greatly reduce the resistance that the nut 12 receives in reciprocating motion, thereby reducing the energy consumption loss of the electric putter.
Secondly, the problem of negative pressure is solved, not only the problem of resistance to the reciprocating movement of the nut 12 is reduced, but also other unexpected effects can be achieved:
1. the traditional electric putter who uses at solar energy photo-thermal technology, though set up seal structure, but because electric putter sets up under open air environment, if the adjacent foreign matter such as adhering to rainwater of seal structure, frost, sand dust, when the push rod takes place to stretch out and draw back, because external atmosphere is greater than the inside atmospheric pressure of electric putter, such rainwater, frost, sand dust and other foreign matter can be by the back-draught into electric putter's inside, so even if seal structure has been set up, still there is the problem that the foreign matter got into electric putter, and after having solved the negative pressure problem, electric putter is when stretching out and draw back, its inside atmospheric pressure is unanimous with outside atmospheric pressure, can guarantee at least that the phenomenon of back-draught no longer takes place, reduce the hidden danger that the foreign matter got into electric putter inside.
2. The traditional electric push rod applied to the solar photo-thermal technology has the working environment temperature of minus 30 ℃ to 70 ℃, so that under the extreme severe environment, the temperature difference between day and night is 70 ℃ and minus 30 ℃ and reaches 100 ℃, under the condition, the pressure inside the electric push rod is greatly different from the pressure outside through 100 ℃ of temperature difference change inside the sealed electric push rod, and under the action of atmospheric pressure, the load of the sealing structure is very large, the ageing procedure is aggravated, and the service life of the sealing structure is influenced. After the problem of negative pressure is solved, even though the temperature difference of 100 ℃ is carried out day and night, the pressure intensity of the inside and the pressure intensity of the outside of the push rod can be kept consistent, at least the burden on a sealing structure caused by inconsistent internal and external pressure intensity can be greatly reduced, and the service life of the electric push rod is prolonged.
The specific structure of the cable 2 is shown in connection with fig. 2 and 3, the cable 2 includes a sheath 21, a hollow conduit 22 is disposed in the sheath 21, the inner cavity of the hollow conduit 22 forms the ventilation channel 201, the hollow conduit 22 is located at the central axis position of the sheath 21, a core wire 23 in the cable 2 is located between the hollow conduit 22 and the sheath 21, the sheath 21 serves as external protection, water and dust are prevented, the hollow conduit 22 serves as ventilation, and the interior of the electric push rod and the exterior of the electric push rod are communicated. The hollow conduit 22 may be a metal mesh tube, and may be used as the ventilation channel 201 as long as the core wires 23 are spaced apart so that a large gap is formed between the core wires 23. In addition, the filler 24 may be disposed in the sheath 21, so that the cable 2 is more filled, and the ventilation effect is not affected because the hollow conduit 22 is provided.
The inner diameter of the hollow conduit 22 is 1mm to 15mm, preferably 5mm, and too large an inner diameter of the hollow conduit 22 tends to cause the overall wire diameter of the cable 2 to be thicker, increase the cost, and relatively increase the weight, and if too small an inner diameter of the hollow conduit 22, the cable 2 is once folded, the hollow conduit 22 is easily folded into a seal, thereby causing poor ventilation.
The cable 2 is divided into an inner cable section and an outer cable section according to different actual positions, the inner cable section is a part positioned in the electric push rod, the outer cable section is a part positioned outside the electric push rod, and because the connection between the cable 2 and the motor 10 is generally at the end part, a first side opening for communicating with the ventilation channel 201 is arranged on the cable 2 for enhancing the ventilation effect, so that gas can enter the hollow conduit 22 through the first side opening, and the first side opening is positioned on the inner cable section; similarly, the cable outer section is provided with a second side opening for communicating with the ventilation channel 201, the second side opening preferably being provided at the end of the cable outer section.
In addition, in the solar thermal power generation technology, the accuracy requirement on the rotation angle of the heliostat is high, so that the expansion and contraction amount of the electric push rod is controlled automatically by a set of control system, the control system is not the invention point of the embodiment, and is not described too much, the control system needs a zero position reference for controlling the expansion and contraction of the inner tube 15, so that the zero position reference is necessarily accurate, the existing electric push rod is sensed by means of a contact type limit switch, firstly, the accuracy of the contact type limit switch is not very good, secondly, the detection accuracy after abrasion is changed due to long-term extrusion contact, and if the electric push rod is applied to the solar thermal power generation technology, the driving accuracy of the contact type limit switch cannot be ensured.
In order to solve this problem, as shown in fig. 4 to 11, the conventional contact-type limit switch is improved to the photoelectric sensor 30 in the present embodiment, the photoelectric sensor 30 is a sensor using a photoelectric element as a detecting element, which firstly converts the measured change into a change of an optical signal, and then further converts the optical signal into an electrical signal by means of the photoelectric element, and in addition, the present embodiment further provides a touch plate 31, wherein the touch plate 31 is driven to move toward the photoelectric sensor 30 when the nut 12 returns to the initial position, so that the design has the advantages that firstly, the accuracy and the response of the photoelectric sensor 30 are high, the response of the photoelectric sensor 30 is very rapid, and the position of the touch plate 31 can be sensed immediately after the touch plate 31 moves toward the target position, namely, the position corresponding to the position of the nut 12 is sensed, and compared with the conventional limit switch, the sensitivity is very good.
Secondly, the photoelectric sensor 30 is basically non-contact, that is, the touch plate 31 does not need to contact the photoelectric sensor 30, so that acting force between the touch plate 31 and the photoelectric sensor 30 can not happen, abrasion can not happen, the problem of large error can not happen after long-term use, and the precision can be ensured as early as possible.
After guaranteeing in the precision for the zeroing position of nut 12 at every turn is accurate, so when control system carries out control propulsion to electric putter, can guarantee that electric putter's relative flexible precision is better, thereby can realize the heliostat effect accurately, thereby let the solar energy of heliostat reflection reflect to the acquisition tower accurately.
The concrete structure is as follows:
the embodiment makes the inductive switch at the initial position of the inductive nut 12 into a modularized component, and the modularized design has the advantages of being capable of being installed in a generalized mode, and comprises a fixed seat 32 and a touch plate 31, wherein the fixed seat 32 and the transmission screw 11 are fixed at the axial maintaining position, the photoelectric sensor 30 is installed on the fixed seat 32, the photoelectric sensor 30 in the embodiment is a groove-type photoelectric sensor and comprises a sensor main body 301 and a PCB 302, a trigger lug 311 is arranged on the touch plate 31, and after the trigger lug 311 stretches into a groove of the photoelectric sensor 30, light is blocked, so that the photoelectric sensor 30 is triggered to generate a signal.
In order to simplify the installation, in this embodiment, the integral modularized induction switch is fixed on the electric push rod through the compression action between the outer tube 14 and the base 13, as shown in fig. 5, the outer tube 14 is fixed on the base 13 through a threaded connection mode, wherein the centers of the touch plate 31 and the fixing seat 32 are hollow for the transmission screw 11 to pass through, and meanwhile, the outer ring of the fixing seat 32 is convexly provided with a positioning ring 321. During installation, the whole assembly in fig. 6 is sleeved outside the driving screw 11, then the outer tube 14 is installed on the base 13 in a spiral connection mode, and after the installation is finished, the positioning ring 321 is tightly pressed between the end face of the outer tube 14 and the base 13, so that the fixing and positioning effect is achieved, the fixing by using a fastener is omitted, and the installation is simplified.
Specific mounting structure of the photoelectric sensor 30: the fixing base 32 of this embodiment is provided with a containing cavity 322, see fig. 9, the photoelectric sensor 30 is installed in the containing cavity 322, the containing cavity 322 is provided with a first opening 322a, the first opening 322a is disposed on one side facing the touch plate 31, the triggering bump 311 can extend into the containing cavity 322 through the first opening 322a and enter into the groove of the photoelectric sensor 30, and the effect of the containing cavity 322 is that the photoelectric sensor 30 can be better protected, substances such as dust and lubricating oil are prevented from entering into the groove of the photoelectric sensor 30, and the detection of the photoelectric sensor 30 is affected.
In order to assemble the photoelectric sensor 30 more conveniently, the accommodating cavity 322 is further provided with a second opening 322b, the second opening 322b is arranged on one side far away from the touch panel 31, the caliber of the second opening 322b is larger than that of the first opening 322a, and when the photoelectric sensor 30 is assembled, the photoelectric sensor 30 is installed in the accommodating cavity 322 through the second opening 322b, and the PCB 302 of the photoelectric sensor 30 is fixed on the fixing seat 32 through fasteners such as screws.
Because the electric putter is the mechanical transmission mode, it is equipped with more lubricating oil especially on the drive screw 11 to scribble on its inside, in the rotation in-process lubricating oil gets rid of photoelectric sensor 30 from first opening 322a, second opening 322b department easily, in addition, because this embodiment is for solar photo-thermal power generation technique, the service environment is in the open air, very big probability has moisture, dust etc. small particle matter to enter into the electric putter inside, these substances also are easy to enter into the recess of photoelectric sensor 30 through first opening 322a, second opening 322b, because the theory of operation of photoelectric sensor 30 just is that the response light is sheltered from, in case light is sheltered from by lubricating oil, small particle matter, will influence photoelectric sensor 30's normal work, in order to solve this problem, this embodiment has set up twice protective structure on fixing base 32.
After the photoelectric sensor 30 is mounted in the accommodating cavity 322 through the second opening 322b, a sealant is coated at the second opening 322b, the sealant can be 704 glue or heat-conducting glue, and the sealant has two functions, namely, the sealing protection of the slit is realized, and the protection of the outgoing line of the photoelectric sensor is realized, so that the outgoing line of the photoelectric sensor is prevented from being broken when external force is applied. Of course, the sealing glue or the sealing ring can be arranged between the PCB 302 of the photoelectric sensor 30 and the fixed seat 32;
the second protective structure, the soft sealing sleeve 33 is installed at the first opening 322a, the triggering bump 311 may penetrate through the soft sealing sleeve 33 and extend into the accommodating cavity 322, after the soft sealing sleeve 33 is disposed, the movement of the touch plate 31 is not affected basically, and the soft sealing sleeve may be made of silicone rubber.
Between touch panel 31 and fixing base 32, set up guide structure, promptly touch panel 31 is provided with many guide posts 34 towards fixing base 32 one side, and is provided with the guide slot 323 that supplies guide post 34 to stretch into on the fixing base 32, guide post 34 matches with guide slot 323 for the guidance quality between touch panel 31 and the fixing base 32 is better, can let trigger lug 311 accurately stretch into in the recess of photoelectric sensor 30. In addition, after the plurality of guide posts 34 are provided, the relative rotation between the touch panel 31 and the fixing base 32 can be prevented.
In order to ensure the reset effect of the touch panel 31, a reset member 35 is disposed between the touch panel 31 and the fixing base 32 in this embodiment, and the reset member in this embodiment is preferably a spring, which is sleeved outside the guide post 34, so that the guide post 34 can play a certain positioning effect on the spring, and meanwhile, a plurality of springs are sleeved, so that the reset acting force is more stable.
In addition, in order to prevent the problem that the guide post 34 is separated from the guide groove 323 due to the separation between the touch plate 31 and the fixed seat 32, in this embodiment, a structure for limiting separation is also provided between the fixed seat 32 and the touch plate 31, specifically, a screw through hole 324 is provided on the fixed seat 32, a counter bore is provided on the end surface of the fixed seat 32 far away from the touch plate 31, a limiting screw 36 penetrates from the counter bore and is limited by the counter bore, and the other end of the limiting screw 36 is fixed on the touch plate 31, so that the maximum distance between the touch plate 31 and the fixed seat 32 can be limited, and the relative movement between the touch plate 31 and the fixed seat 32 is not affected.
Besides the limit of the maximum distance between the touch plate 31 and the fixed seat 32, the minimum distance between the touch plate 31 and the fixed seat 32 also needs to be limited, if not limited, the trigger bump 311 may excessively touch the photoelectric sensor 30, so as to damage the photoelectric sensor 30, so in this embodiment, a plurality of limit protrusions 312 are disposed on one side of the touch plate 31 facing the fixed seat 32, and the limit protrusions 312 are circumferentially disposed to prevent warping.
In addition, in this embodiment, a motor braking device is also disclosed, the motor braking device on the traditional electric putter all adopts the mode of torsional spring braking, when motor shaft 101 normally works, the effort between torsional spring and motor shaft 101 is less, and when electric putter needs to retract, motor shaft 101 is reversed, thereby can drive two free ends of torsional spring to tighten up, thereby play the braking effect, this kind of structure has been very common structure on the electric putter, but the braking structure of this kind of structure still can have certain friction effect between torsional spring and the motor shaft 101 when normally working, and another point, the mode of torsional spring braking, the braking force is unstable.
As shown in fig. 12 to 16, the motor braking device in this embodiment includes a base 41, a connecting shaft 42, a brake pad 43 and an electromagnet 44, wherein the base 41 is fixedly mounted on the motor 10, the connecting shaft 42 is fixedly connected with the motor shaft 101 of the motor 10 or is of an integral structure, the brake pad 43 is fixedly connected with the connecting shaft 42 in the rotation direction and is floatingly connected with the connecting shaft 42 in the axial direction, which means that the connecting shaft 42 drives the brake pad 43 to rotate when rotating, the brake pad 43 is not completely fixed with the connecting shaft 42, the brake pad 43 can relatively move with the connecting shaft 42 in the axial direction of the connecting shaft 42, and the electromagnet 44 is mounted in the base 41. In the working state, an avoidance gap is left between the brake pad 43 and the base 41, and in the braking state, the electromagnet 44 drives the brake pad 43 to float under the action of magnetic force and is attracted to the base 41.
Under normal working conditions, an avoidance gap is reserved between the brake pad 43 and the base 41, and due to the existence of the avoidance gap, no friction is generated between the brake pad 43 and the base 41, and because the brake pad 43 rotates along with the connecting shaft 42, namely, no friction is generated between the connecting shaft 42 and the base 41, in other words, the resistance acting on the motor shaft 101 is basically zero, so that the motor 10 basically does not generate resistance acting on the motor 10 under normal working conditions, and the heating problem is avoided, meanwhile, because the brake pad 43 is not contacted with the base 41 under normal conditions, the mutual abrasion time is less, the service life is longer, and the electric push rod is applied to the electric push rod in the technical field of solar photo-thermal power generation, and particularly, the service life of the electric push rod is ensured to be longer, and the required energy consumption is less.
In the case that the motor 10 needs to be braked, the electromagnet 44 makes the brake pad 43 float under the action of magnetic force, so that the brake pad 43 is attracted to the base 41, the working principle of the electromagnet 44 is that the magnetic force is generated by turning on and off electricity, in the invention, the magnetic force is used for controlling the floating of the brake pad 43, the brake pad 43 is attracted to the base 41, friction force is generated between the brake pad 43 and the base 41, the brake pad 43 is subjected to resistance, the rotating speed is reduced, so that the rotating speed of the connecting shaft 42 is correspondingly reduced, the braking effect of the motor 10 is achieved, the brake device is applied to electric push rods, particularly electric push rods in the technical field of solar photo-thermal power generation, the braking force of the electric push rods is more stable when the electric push rods retract and the braking force is controlled by turning on and off electricity, and the electric push rods in the technical field of solar photo-thermal power generation are also more suitable.
In addition, because the braking is electrically controlled, and the transmitted torsion spring braking is realized by depending on different rotation directions of the motor shaft 101, the electric push rod can realize the braking of the motor 10 no matter the motor shaft 101 is in a forward rotation state or a reverse rotation state.
The motor braking device has the specific structure that:
referring to fig. 13, a base 41 is fixedly mounted on an upper end surface of a motor 10 through a connecting plate 45, the interior of the base 41 is hollow, a connecting shaft 42 in the embodiment is in transmission connection with a motor shaft 101 through a flat position, the connecting shaft 42 is fixedly connected with the motor shaft 101 through a fastening screw, the connecting shaft 42 penetrates through the base 41 and extends out of the upper end surface of the base 41, a fixing disc 46 is mounted on the upper end portion of the connecting shaft 42, the fixing disc 46 is sleeved on the connecting shaft 42 and rotates along with rotation of the connecting shaft 42, and a brake pad 43 is mounted below the fixing disc 46 and is located between the fixing disc 46 and the base 41.
An elastic restoring member 47 is disposed between the brake pad 43 and the fixed disk 46, in this embodiment, the elastic restoring member 47 is preferably a leaf spring, the leaf spring itself has a certain rigidity, the leaf spring in this embodiment is preferably an annular leaf spring, similar to an annular elastic washer, as shown in fig. 15, there are 4 position points in the annular leaf spring in the circumferential direction, the first position point P1 and the third position point P3 are symmetrical to each other, the second position point P2 and the fourth position point P4 are symmetrical to each other, the first position point P1 and the third position point P3 are fixedly connected with the fixed disk 46, such as welded or riveted, and the second position point P2 and the fourth position point P4 are fixedly connected with the brake pad 43, such as welded or riveted. The connection mode of the leaf spring not only realizes that the fixed disc 46 and the brake pad 43 cannot rotate mutually, but also can move relatively in the axial direction between the fixed disc 46 and the brake pad 43, so that the brake pad 43 can move up and down under the action of magnetic force.
It should be noted that, the structure of the leaf spring and the connection manner of the leaf spring in this embodiment are only preferred, in other embodiments, the leaf spring is not limited to a ring shape, but may be a bar shape, and the connection manner of the leaf spring and the fixed disc 46, and the brake pad 43 is not limited to fig. 15, so long as the connection position points of the leaf spring and the fixed disc 46, and the connection position points of the leaf spring and the brake pad 43 do not overlap, both the rotation prevention and the elastic reset effects can be achieved, and such embodiments should fall within the protection scope of the present invention.
In this embodiment, the range of the avoiding gap is 0.2 mm-0.5 mm, preferably 0.3mm, due to assembly errors during assembly, the thickness of the brake pad 43 is also error, and abrasion is also generated after long-term use, the avoiding gap is changed due to the errors and the abrasion, so that the avoiding gap can be ensured to be within 0.2 mm-0.5 mm, in this embodiment, the fixing disc 46 is adjustable, namely, a side threaded hole is formed in the side portion of the fixing disc 46, a fastening screw 48 is arranged in the side threaded hole, the axial position between the fixing disc 46 and the connecting shaft 42 can be finely adjusted, and after fine adjustment, the brake pad is locked by the fastening screw 48, and in addition, preferably, a limiting step 421 is further arranged on the connecting shaft 42, and is used for limiting the lowest position of the fixing disc 46, so as to prevent too small gap between the brake pad 43 and the upper end face of the base 41 after the fixing disc 46 is installed.
It should be noted that, in an axial adjustable manner, other embodiments may be provided, for example, threads are provided on the connecting shaft 42, the fixing plate 46 is provided on the connecting shaft 42 through a threaded connection, two fastening nuts are provided at the upper and lower ends of the fixing plate 46, and the fixing plate 46 is fixed to the connecting shaft 42 through a nut fastening manner. The precision of the adjusting mode is ensured.
For the electromagnet 44, in this embodiment, the electromagnet 44 includes an inner ring 441, a coil 442 and a magnet 443, where the inner ring 441 is sleeved on the connecting shaft 42, the coil 442 is wound outside the inner ring 441, the magnet is disposed at an end of the coil 442, specifically, is disposed at a lower portion of the coil 442, the base 41 in this embodiment is made of metal, in an energized state, the coil 442 is energized to generate a magnetic field so as to cancel the magnetic field of the magnet 443 in a normal operation state, at this time, no magnetic force is generated on an upper end surface of the base 41, no attraction force is generated on the brake pad 43, in this state, there is a clearance between the brake pad 43 and the upper end surface of the base 41, and when in a de-energized state, the motor 10 is de-energized generally, at this time, the coil 442 does not generate a magnetic field, and the magnet 443 transmits the magnetic force to the upper end surface of the base 41, the upper end surface of the base 41 generates a magnetic force on the brake pad 43, and overcomes the force of the leaf spring to attract the base 41, thereby generating a friction resistance on the brake pad 43, and thus providing a braking effect.
In addition, the side of the base 41 is provided with a threading hole 411 through which the coil 442 or the wire passes, so that the coil 442 or the wire connected with the coil 442 can be conveniently protruded from the inside of the base 41 to the outside of the base 41. In addition, in order to reduce the abrasion of the upper end face of the base 41, in this embodiment, the upper end face of the base 41 is provided with an abrasion-resistant layer, or the top of the base 41 adopts an independent abrasion-resistant end cover 412, so that the abrasion degree of the base 41 can be reduced, and meanwhile, the avoidance gap can be prevented from being greatly changed after long-term braking.
Example 2
As shown in fig. 16, the difference between the present embodiment and embodiment 1 is that there is no hollow conduit in the present embodiment, the core wire 23 inside the cable 2 in the present embodiment includes a core wire sleeve 231, the outside of the core wire sleeve 231 is provided with a protruding rib 232, after the protruding rib 232 is provided, the core wires 23 are not closely attached, but a certain gap is generated between the core wires 23 and the inner wall of the sheath 21, and at the same time, a certain gap is generated between the core wires 23 and the inner wall of the sheath 21, and these gaps naturally form the ventilation channel 201.
Example 3
The difference between this embodiment and embodiment 1 is that in this embodiment, no fixing seat is provided, the photoelectric sensor is directly and fixedly mounted on the base, and the touch panel is also mounted on the base and is mounted in a sliding fit with the base, and in a specific structure, a sliding groove is provided on the base, so that the touch panel is slidably mounted in the sliding groove, and after the photoelectric sensor is mounted on the base, the photoelectric sensor is covered with a protective cover to play a role of oil resistance, and of course, the protective cover is correspondingly provided with a first opening as in embodiment 1, so that the trigger protrusion extends into or extends out.
Example 4
The difference between this embodiment and embodiment 1 lies in that the structure of the electromagnet is different, and the electromagnet in this embodiment adopts the most common electromagnet structure, the electromagnet includes the magnetic core and winds the coil of establishing outside the magnetic core, the magnetic core cover is established on the connecting axle, the break-make condition of this embodiment coil is opposite with the break-make of motor, i.e. the motor is in the normal work, the coil is in the outage state, in this state, the magnetic core itself does not produce the magnetic field, can not produce the suction to the brake block, so as to ensure that there is the clearance of dodging between fixing base and the brake block, when the motor is cut off the power supply, the magnetic core produces the magnetic field this moment, produce the suction to the brake block, thereby with the brake block actuation to the fixing base. In this embodiment, the coil is energized only when braking is required, and most of the time, the coil is de-energized, thus saving energy.
Example 5
The difference between this embodiment and embodiment 1 lies in that, the elastic restoring element in the motor brake device in this embodiment is the spring, the one end and the fixed disk fixed connection of spring, the other end and the brake block fixed connection of spring, but because the spring is flexible by itself, after the installation like this, still rotate each other easily between brake block and the fixed disk, in order to solve this problem, the fixed disk sets up spacing post more than 2, set up the spacing hole that matches with spacing post on the brake block, when the relative movement takes place for brake block and fixed disk, spacing post is in spacing downthehole all the time, and spacing hole can restrict spacing post rotation moreover, thereby just avoided the brake block to take place relative rotation with the fixed disk, the preferred, the spring can be established on spacing post in the cover.
While the invention has been described in terms of embodiments, it will be appreciated by those skilled in the art that the invention is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.
Claims (14)
1. The utility model provides a solar energy is electric putter for photo-thermal power generation, be equipped with the motor in the electric putter, motor drive is connected with drive screw, drives the nut when drive screw rotates and moves for drive screw axial direction, its characterized in that, the motor is connected with the cable conductor, the cable conductor stretches out outside the electric putter, the cable conductor includes the sheath, be equipped with the intercommunication in the sheath electric putter inside with the outside passageway of ventilating of electric putter, the electric putter still includes photoelectric sensor and is used for triggering photoelectric sensor's touch panel, the electric putter still includes the fixing base, and the touch panel is provided with many guide posts towards fixing base one side, and then is provided with the guide way that supplies the guide post to stretch into on the fixing base, and the guide post matches with the guide way.
2. The electric push rod for solar photo-thermal power generation according to claim 1, wherein a hollow conduit or a metal mesh tube is arranged in the sheath, and an inner cavity of the hollow conduit or the metal mesh tube forms the ventilation channel.
3. The electric putter for solar photo-thermal power generation according to claim 2, wherein the inner diameter of the hollow conduit or the metal mesh tube is 1mm to 15mm.
4. The electric push rod for solar photo-thermal power generation according to claim 1, wherein a core wire is arranged in the sheath, the core wire comprises a core wire sleeve, ribs are arranged outside the core wire sleeve, gaps are formed between adjacent core wires or between the core wires and the sheath by the ribs, and the gaps form the ventilation channels.
5. The electric putter for solar thermal power generation according to any one of claims 1 to 4, wherein a filler is provided in the sheath.
6. The electric push rod for solar photo-thermal power generation according to any one of claims 1 to 4, wherein the part of the electric cable located in the electric push rod is an inner cable section, and a first side opening for communicating with the ventilation channel is formed in the inner cable section; and/or the part of the cable extending out of the electric push rod is a cable outer section, and a second side opening used for communicating the ventilation channel is formed in the cable outer section.
7. The electric push rod for solar photo-thermal power generation according to any one of claims 1 to 4, wherein the drive screw drives a nut to reciprocate between an initial position and a limit position, and the nut drives the touch plate to move towards the photoelectric sensor when returning to the initial position.
8. The electric push rod for solar photo-thermal power generation according to claim 7, wherein the fixing base and the driving screw are fixed in axial maintaining position, and the photoelectric sensor is mounted on the fixing base.
9. The electric push rod for solar photo-thermal power generation according to claim 8, wherein the fixing seat is provided with a containing cavity, the photoelectric sensor is installed in the containing cavity, the containing cavity is provided with a first opening, and the touch plate comprises a triggering protruding block capable of extending into the containing cavity through the first opening.
10. The electric push rod for solar photo-thermal power generation according to claim 9, wherein a soft sealing sleeve is arranged at the first opening, and the triggering lug can penetrate through the soft sealing sleeve and extend into the accommodating cavity; and/or the accommodating cavity is provided with a second opening, the photoelectric sensor is arranged in the accommodating cavity through the second opening, and sealant is arranged at the second opening.
11. Electric putter for solar thermal power generation according to one of claims 1 to 4, characterized in that said motor is connected with a motor braking device comprising:
the fixed seat is fixedly arranged on the motor;
The connecting shaft is fixedly connected with a motor shaft of the motor or is of an integral structure:
the brake block rotates along with the connecting shaft in the rotation direction and is in floating connection with the connecting shaft in the axial direction:
an electromagnet mounted in the fixed seat;
in the working state, an avoidance gap is reserved between the brake pad and the fixed seat, and in the braking state, the electromagnet drives the brake pad to float under the action of magnetic force and is attracted to the fixed seat.
12. The electric push rod for solar photo-thermal power generation according to claim 11, wherein a fixed disc is installed on the connecting shaft, the fixed disc rotates synchronously with the connecting shaft, and an elastic reset piece is arranged between the fixed disc and the brake pad.
13. The electric push rod for solar photo-thermal power generation according to claim 12, wherein the fixed disk is axially movable with respect to the connecting shaft and is positioned on the connecting shaft by a fastener.
14. The electric putter for solar photo-thermal power generation according to claim 11, wherein the electromagnet comprises an inner ring, a coil and a magnet, the inner ring is sleeved on the connecting shaft, the coil is wound outside the inner ring, and the magnet is arranged at the end of the coil; or, the electromagnet comprises a magnetic core and a coil wound outside the magnetic core, and the magnetic core is sleeved on the connecting shaft.
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| CN201710490944.5A CN107453534B (en) | 2017-06-23 | 2017-06-23 | Electric push rod for solar photo-thermal power generation |
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