CN107298518B

CN107298518B - Sludge dewatering system

Info

Publication number: CN107298518B
Application number: CN201710411195.2A
Authority: CN
Inventors: 张福增; 甘永平; 张文魁; 黄辉; 夏阳; 梁初; 张俊; 饶祎
Original assignee: Ningbo Beilun Lyuyi Environmental Protection Technology Co ltd; Zhejiang University of Technology ZJUT
Current assignee: Ningbo Beilun Lyuyi Environmental Protection Technology Co ltd; Zhejiang University of Technology ZJUT
Priority date: 2017-06-02
Filing date: 2017-06-02
Publication date: 2020-05-08
Anticipated expiration: 2037-06-02
Also published as: CN107298518A

Abstract

The invention discloses a sludge dewatering system, which belongs to the technical field of sludge dewatering equipment and has good dewatering effect, and comprises an outer pipe, wherein a sludge input mechanism is connected to the lower port of the outer pipe in an insulated manner, and a mud cake output mechanism provided with a differential mechanism is connected to the upper port of the outer pipe in an insulated manner; an inner pipe is arranged in the outer pipe, the lower end of the inner pipe is rotatably connected to the sludge input mechanism, and the upper end of the inner pipe is fixedly connected to a differential output rotating shaft of the differential mechanism; the lower end of the outer surface of the inner pipe is provided with an inner pipe lower hole communicated with the pipe cavity of the inner pipe, a blocking plate is fixedly connected in the pipe cavity of the inner pipe in a sealing manner, and the blocking plate is positioned on the upper side of the inner pipe lower hole; the outer surface of the inner pipe is provided with a spiral conveying sheet which can convey sludge between the outer pipe and the inner pipe from bottom to top, and the sludge input mechanism is respectively provided with a sludge inlet and a water outlet; an insulating support is arranged on the inner pipe wall of the outer pipe, and an anode mechanism is arranged on the insulating support; the inner tube is a cathode mechanism.

Description

Sludge dewatering system

Technical Field

The invention relates to the technical field of sludge dewatering equipment, in particular to a sludge dewatering system.

Background

The water content in the sludge is roughly divided into four types, namely capillary water among particles, interstitial water, adsorbed water of the particles and internal water, and the relationship between the binding degree of various water contents and sludge particles can be expressed as follows: internal water > adsorbed water > capillary water > interstitial water. Since the internal water, adsorbed water, capillary water and interstitial water in the sludge generally contain bacteria.

The existing sludge treatment equipment generally adopts a mechanical dehydration mode such as a centrifugation method or a filtration method to remove the interstitial water in the sludge, and then the sludge containing internal water, adsorption water and capillary water is not treated any more, so that the treated sludge still has great influence on the environment.

Disclosure of Invention

The invention aims to overcome the defects that the existing sludge treatment equipment cannot treat internal water, adsorbed water and capillary water in sludge, and provides the sludge dewatering system which is pollution-free, high in flexibility, strong in reliability, good in dewatering effect, easy to maintain, capable of performing electrolytic dewatering on sludge and capable of performing inclination control and rocking rotation speed control on an electrolytic cavity in the process of performing electrolytic dewatering on sludge.

The technical problem is solved by the following technical scheme:

the sludge dewatering system comprises a sludge gap water filtering mechanism, and also comprises a microcontroller, an outer pipe and a sludge pump, wherein the lower port of the outer pipe is connected with a sludge input mechanism in an insulating way, and the upper port of the outer pipe is connected with a sludge cake output mechanism provided with a differential mechanism in an insulating way; an inner pipe is arranged in the outer pipe, the lower end of the inner pipe is connected to the sludge input mechanism in an insulated and rotating mode, and the upper end of the inner pipe is fixedly connected to a differential output rotating shaft of the differential mechanism in an insulated mode; thereby forming an electrolysis chamber between the inner tube and the outer tube; the outer surface of the inner pipe is provided with a spiral conveying sheet which can convey sludge between the outer pipe and the inner pipe from bottom to top, and the sludge input mechanism is respectively provided with a sludge inlet and a water outlet which are communicated with the electrolysis cavity; an insulating support is arranged on the inner pipe wall of the outer pipe, and an anode mechanism is arranged on the insulating support; the inner pipe is a cathode mechanism; the sludge inlet of the sludge pump is in butt joint with the sludge outlet of the sludge gap water filtering mechanism, and the sludge outlet of the sludge pump is in butt joint with the sludge outlet of the sludge input mechanism. The sludge dewatering system also comprises a base, a hanger, a lifting rope and a support column, wherein the lower end of the support column is connected to the base in a universal rotating manner, and the upper end of the support column is fixedly connected to the lower end of the sludge input mechanism; the hanging bracket is provided with a cylinder with a downward telescopic rod, and a rotating handle motor with a downward rotating shaft is fixedly connected to the telescopic rod of the cylinder; the rotating handle motor is not only positioned right above the base, but also positioned above the mud cake output mechanism; one end of a rocker is horizontally and fixedly connected to a rotating shaft of the rotating handle motor, two ends of a lifting rope are respectively connected to the mud cake output mechanism and the other end of the rocker, and a control end of the air cylinder and a control end of the rotating handle motor are respectively connected with the microcontroller.

The electrolytic treatment technology is that under the action of an external electric field, a series of electrochemical reactions are designed in a reactor to generate a large amount of free radicals, and pollutants are degraded by utilizing the strong oxidizing property of the free radicals. The principle of the electrolytic dehydration is that the sludge is a flocculent substance with zoogloea as a main body and has certain negative charges. The center of the colloid is called the nucleus. A layer of charged ions, called the potential ions of colloidal particles, is adsorbed on its surface. These potential ions are either produced by the ionization of the glue nucleus or by the adsorption of the glue nucleus from water. Because potential ions have electrostatic attraction, and a large number of ions with opposite charges are adsorbed around the potential ions, so-called "double electric layers" are formed. The ions in the portion of the ions close to the potential ions are strongly attracted to form a compact layer due to the strong electrostatic force; among these ions, ions far from the potential ions tend to diffuse into water due to weak electrostatic force, thereby forming a diffusion layer. The difference in electrical trend between the compact layer and the diffusion layer is called the Stern potential, and the interface between the compact layer and the diffusion layer is called the sliding surface. The part inside the sliding surface is called colloidal particles, and a potential difference exists between the colloidal particles and the diffusion layer, and the potential difference is called the electromotive potential of the colloid. The sliding surface is generally present in the Stern layer, i.e. the interface between the compact layer and the diffusion layer in the electric double layer. The phenomenon of movement of a dispersion medium (usually water) relative to the dispersion interaction with which it is in contact under the action of an electric field is known as electroosmosis. And applying voltage to the sludge, and moving the counter ions in the diffusion layer to the electrode along the sliding surface and driving water molecules to move. For the sludge colloid particles with negative electrokinetic potential, all water is subjected to the traction force of the motion of the negative electrode, and the electrolytic dehydration starts to operate, so that the sludge dehydration is realized.

When sludge is to be dewatered, the anode mechanism is connected with the anode power supply, and the cathode mechanism is connected with the cathode power supply.

Firstly, removing interstitial water in sludge by using a sludge interstitial water filtering mechanism, wherein the sludge after the interstitial water is removed also contains internal water, adsorption water and capillary water, then sending the sludge containing the internal water, the adsorption water and the capillary water into a sludge inlet of a sludge input mechanism by using a sludge pump, and then sending the sludge into an electrolysis cavity between an anode mechanism and a cathode mechanism for electrolytic dehydration. The water after the sludge is electrolyzed and dehydrated flows out from a water outlet on the sludge input mechanism, and the mud cakes after the sludge is electrolyzed and dehydrated are output from a mud cake output mechanism.

When sludge is electrolyzed and dehydrated, the inclination of the electrolysis cavity can be controlled by controlling the extension length of the telescopic rod of the air cylinder, the swing speed control of the electrolysis cavity can be controlled by controlling the rotating speed of the rotating handle motor, and the reliability is high.

The scheme firstly removes the water in the gaps in the sludge, and then dehydrates the sludge in the electrolytic cavity, so that the sludge dehydrator is high in dehydration efficiency, free of pollution, high in flexibility, strong in reliability, good in dehydration effect and easy to maintain, and can dehydrate the internal water, the adsorbed water and the capillary water in the sludge in an electrolytic dehydration mode. Can carry out the electrolytic dehydration to mud, can carry out the gradient control and shake the speed control in the electrolysis chamber in the in-process of carrying out the electrolytic dehydration to mud.

Preferably, the outer tube comprises a left column, a right column, a lower tube, an upper tube, a plurality of left semicircular sheets and right semicircular sheets with the number equal to that of the left semicircular sheets; the lower port of the lower pipe is connected with the sludge input mechanism, and the upper port of the upper pipe is connected with the sludge cake output mechanism; the upper end and the lower end of the left column are respectively connected with the lower pipe and the upper pipe, and the upper end and the lower end of the right column are also respectively connected with the lower pipe and the upper pipe; the left end of each left semicircular sheet is rotatably connected to the left column, and the right end of each left semicircular sheet is fixedly connected to the right column in a locking manner; the left end of each right semi-circular sheet is also rotationally connected to the left column, the right end of each right semi-circular sheet is also fixedly connected to the right column in a locking manner, and the left semi-circular sheet and the right semi-circular sheet are arranged in a one-to-one opposite mode; the insulating support comprises insulating blocks with the number equal to the number of the left semicircular pieces plus the number of the right semicircular pieces, and the insulating blocks are connected to the inner surface of the left semicircular piece and the inner surface of the right semicircular piece in a one-to-one mode; the anode mechanism comprises anode plates with the number of blocks equal to that of the insulating blocks; the inner surface of the insulating block is transversely provided with a guide groove, and the anode plates are fixedly connected in the guide groove of the insulating block in a one-to-one sliding manner; when the right end of each right semicircular sheet and the right end of each right semicircular sheet which are arranged oppositely are fixedly connected to the right column in a locking manner, an electrolysis cavity is formed between the anode plate corresponding to the left semicircular sheet and the insulating block of the right semicircular sheet.

The structure is convenient to maintain, when the anode plate is damaged, the left half-round piece or the right half-round piece of the corresponding anode plate can be opened to maintain or replace the damaged anode plate, the maintenance is convenient and simple, and the reliability is high.

Preferably, the sludge dewatering system further comprises a storage and a display, an outer chute is arranged on the blade part of the spiral conveying sheet along the blade part of the spiral conveying sheet, an inner chute is arranged on the inner bottom surface of the outer chute along the outer chute, and a wiring groove with the diameter larger than the width of the inner chute is arranged on the inner bottom surface of the inner chute along the inner chute; a pull wire is arranged in the wiring groove, a connecting rod is arranged in the inner sliding groove, a sliding block is arranged in the outer sliding groove, and the sliding block is fixedly connected to the pull wire through the connecting rod; the sliding block is detachably connected with a distance measuring instrument; an upper machine cavity communicated with the wiring groove is arranged in the inner pipe at the upper end of the inner pipe, a lower machine cavity communicated with the wiring groove is also arranged in the inner pipe at the lower end of the inner pipe, an upper winding motor is arranged in the upper machine cavity, a lower winding motor is arranged in the lower machine cavity, the upper end of a pull wire is fixedly connected to a rotating shaft of the upper winding motor, and the lower end of the pull wire is fixedly connected to a rotating shaft of the lower winding motor; the memory, the display, the distance measuring instrument, the control end of the lower winding motor and the control end of the upper winding motor are respectively connected with the microcontroller.

The distance between the cutting part of the spiral conveying piece and the anode plate can be measured through the distance measuring instrument, and the distance between the anode plate and the cathode mechanism can be obtained according to the measured distance between the anode plate and the cutting part of the spiral conveying piece. This scheme still can measure whether the anode plate has damage such as pit through the distancer, is convenient for to the detection and the maintenance of anode plate.

The invention can achieve the following effects:

the invention firstly uses a sludge gap water filtering mechanism to remove gap water in sludge, the sludge after the gap water is removed also contains internal water, adsorption water and capillary water, then a sludge pump is used to send the sludge containing the internal water, the adsorption water and the capillary water into a sludge inlet of a sludge input mechanism, and the sludge enters an electrolysis cavity between an anode mechanism and a cathode mechanism from a lower hole of an inner pipe under the blocking action of a blocking plate to carry out electrolysis dehydration. The water after the sludge is electrolyzed and dehydrated flows out from a water outlet on the sludge input mechanism, and the mud cakes after the sludge is electrolyzed and dehydrated are output from a mud cake output mechanism. The device has the advantages of no pollution, high flexibility, strong reliability, good dehydration effect and easy maintenance, and can remove internal water, adsorbed water and capillary water in the sludge in an electrolytic dehydration mode.

Drawings

Fig. 1 is a schematic cross-sectional view of a connection structure of the present invention.

FIG. 2 is a schematic view of a cross-sectional connection structure at a slide block of a blade of a spiral conveying blade according to the present invention.

Fig. 3 is a schematic view of a connection structure of the upper and lower winding motors of the present invention on the screw conveyer blade.

Fig. 4 is a schematic block diagram of a circuit schematic connection structure of the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples.

In the embodiment, the sludge dewatering system, as shown in fig. 1-4, comprises a sludge gap water filtering mechanism 22, and further comprises a microcontroller 46, an outer pipe 27 and a mud pump 21, wherein the lower port of the outer pipe is connected with a sludge input mechanism 18 in an insulated manner, and the upper port of the outer pipe is connected with a mud cake output mechanism 6 provided with a differential mechanism 4 in an insulated manner; an inner pipe 9 is arranged in the outer pipe, the lower end of the inner pipe is connected to the sludge input mechanism in an insulated and rotating mode 16, and the upper end of the inner pipe is fixedly connected to a differential output rotating shaft of the differential mechanism in an insulated mode; thereby forming an electrolysis chamber 28 between the inner and outer tubes; the outer surface of the inner pipe is provided with a spiral conveying sheet 14 which can convey sludge between the outer pipe and the inner pipe from bottom to top, and the sludge input mechanism is respectively provided with a sludge inlet 20 and a water outlet 19 which are communicated with the electrolysis cavity; an insulating bracket 26 is arranged on the inner pipe wall of the outer pipe, and an anode mechanism 30 is arranged on the insulating bracket; the inner tube is a cathode mechanism 13; the sludge inlet of the sludge pump is in butt joint with the sludge outlet of the sludge gap water filtering mechanism, and the sludge outlet of the sludge pump is in butt joint with the sludge outlet of the sludge input mechanism.

The sludge dewatering system also comprises a base 49, a hanger 50, a lifting rope 51 and a support column 52 with the lower end connected to the base in a universal rotating manner, and the upper end of the support column is fixedly connected to the lower end of the sludge input mechanism; an air cylinder 57 with a downward telescopic rod is arranged on the hanger, and a rotating handle motor 53 with a downward rotating shaft is fixedly connected to a telescopic rod 56 of the air cylinder; the rotating handle motor is not only positioned right above the base, but also positioned above the mud cake output mechanism; one end of a rocker 54 is horizontally and fixedly connected to a rotating shaft 55 of the handle motor, two ends of a lifting rope are respectively connected to the mud cake output mechanism and the other end of the rocker, and a control end of the air cylinder and a control end of the handle motor are respectively connected with the microcontroller.

The outer tube 27 comprises a left column 24, a right column 11, a lower tube 17, an upper tube 7, a plurality of left semicircular sheets 23 and right semicircular sheets 25 with the number equal to that of the left semicircular sheets; the lower port of the lower pipe is connected with the sludge input mechanism, and the upper port of the upper pipe is connected with the sludge cake output mechanism; the upper end and the lower end of the left column are respectively connected with the lower pipe and the upper pipe, and the upper end and the lower end of the right column are also respectively connected with the lower pipe and the upper pipe; the left end of each left semicircular sheet is rotatably connected to the left column, and the right end of each left semicircular sheet is fixedly connected to the right column in a locking manner; the left end of each right semi-circular sheet is also rotationally connected to the left column, the right end of each right semi-circular sheet is also fixedly connected to the right column in a locking manner, and the left semi-circular sheet and the right semi-circular sheet are arranged in a one-to-one opposite mode; the insulation support comprises insulation blocks 10 with the number equal to the number of the left semicircular pieces plus the number of the right semicircular pieces, and the insulation blocks are connected on the inner surface of the left semicircular piece and the inner surface of the right semicircular piece in a one-to-one mode; the anode mechanism comprises anode plates 29 with the number of blocks equal to that of the insulating blocks; the inner surface of the insulating block is transversely provided with a guide groove 45, and the anode plates are fixedly connected in the guide groove of the insulating block in a one-to-one sliding manner; when the right end of each right semicircular sheet and the right end of each right semicircular sheet which are arranged oppositely are fixedly connected to the right column in a locking manner, an electrolysis cavity 28 is formed between the anode plate corresponding to the left semicircular sheet and the insulating block of the right semicircular sheet.

When the right end of each right semicircular sheet and the right end of each right semicircular sheet which are arranged oppositely are fixedly connected to the right column in a locking mode, the inner surface of the left column, the inner surface of the right semicircular sheet and the inner surface of the right semicircular sheet are on the same circumferential surface.

The sludge dewatering system also comprises a storage 47 and a display 48, wherein an outer chute 34 is arranged on the blade part of the spiral conveying sheet along the blade part 33 of the spiral conveying sheet, an inner chute 36 is arranged on the inner bottom surface of the outer chute along the outer chute, and a wiring groove 37 with the diameter larger than the width of the inner chute is arranged on the inner bottom surface of the inner chute along the inner chute; a pull wire 38 is arranged in the wiring groove, a connecting rod 35 is arranged in the inner sliding groove, a sliding block 32 is arranged in the outer sliding groove, and the sliding block is fixedly connected to the pull wire through the connecting rod; the distance measuring instrument 31 is detachably connected to the sliding block; an upper machine cavity 39 communicated with the wiring groove is arranged in the inner pipe at the upper end of the inner pipe, a lower machine cavity 44 communicated with the wiring groove is also arranged in the inner pipe at the lower end of the inner pipe, an upper winding motor 41 is arranged in the upper machine cavity, a lower winding motor 43 is arranged in the lower machine cavity, the upper end of a pull wire is fixedly connected to a rotating shaft 40 of the upper winding motor, and the lower end of the pull wire is fixedly connected to a rotating shaft 42 of the lower winding motor; the memory, the display, the distance measuring instrument, the control end of the lower winding motor and the control end of the upper winding motor are respectively connected with the microcontroller. And the control end of the differential is connected with the microcontroller.

The left half-round piece 23 in this embodiment includes a first left half-round piece 1, a second left half-round piece 2, and a third left half-round piece 3, and the right half-round piece 25 includes a first right half-round piece 15, a second right half-round piece 12, and a third right half-round piece 8.

In this embodiment, when sludge is to be dewatered, the anode mechanism is connected to a positive power supply, and the cathode mechanism is connected to a negative power supply.

Firstly, removing interstitial water in sludge by using a sludge interstitial water filtering mechanism, wherein the sludge after the interstitial water is removed also contains internal water, adsorption water and capillary water, then sending the sludge containing the internal water, the adsorption water and the capillary water into a sludge inlet of a sludge input mechanism by using a sludge pump, and then sending the sludge into an electrolysis cavity between an anode mechanism and a cathode mechanism for electrolytic dehydration. The water after the sludge is electrolyzed and dehydrated flows out from a water outlet on the sludge input mechanism, and the mud cakes after the sludge is electrolyzed and dehydrated are output from a mud cake outlet 5 on the mud cake output mechanism. When sludge is electrolyzed and dehydrated, the inclination of the electrolysis cavity can be controlled by controlling the extension length of the telescopic rod of the air cylinder, the swing speed control of the electrolysis cavity can be controlled by controlling the rotating speed of the rotating handle motor, and the reliability is high. The embodiment firstly removes the water in the gaps in the sludge, and then dehydrates the sludge in the electrolytic cavity, so that the dehydration efficiency is high, the pollution is avoided, the flexibility is high, the reliability is strong, the dehydration effect is good, the maintenance is easy, and the internal water, the adsorption water and the capillary water in the sludge can be dehydrated in an electrolytic dehydration mode. When the anode plate is damaged, the left half-round piece or the right half-round piece of the corresponding anode plate can be opened to maintain or replace the damaged anode plate. The distance between the blade part of the spiral conveying piece and the anode plate can be measured through the distance measuring instrument, and the distance between the anode plate and the cathode mechanism can be obtained according to the measured distance between the anode plate and the blade part of the spiral conveying piece. The embodiment can also measure whether the anode plate is damaged by a pit and the like through the distance meter, and is convenient for detecting and maintaining the anode plate.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the implementation is not limited to the above-described embodiments, and those skilled in the art can make various changes or modifications within the scope of the appended claims.

Claims

1. The sludge dewatering system comprises a sludge gap water filtering mechanism and is characterized by also comprising a microcontroller, an outer pipe and a sludge pump, wherein the lower port of the outer pipe is connected with a sludge input mechanism in an insulating way, and the upper port of the outer pipe is connected with a sludge cake output mechanism provided with a differential mechanism in an insulating way; an inner pipe is arranged in the outer pipe, the lower end of the inner pipe is connected to the sludge input mechanism in an insulated and rotating mode, and the upper end of the inner pipe is fixedly connected to a differential output rotating shaft of the differential mechanism in an insulated mode; thereby forming an electrolysis chamber between the inner tube and the outer tube; the outer surface of the inner pipe is provided with a spiral conveying sheet which can convey sludge between the outer pipe and the inner pipe from bottom to top, and the sludge input mechanism is respectively provided with a sludge inlet and a water outlet which are communicated with the electrolysis cavity; an insulating support is arranged on the inner pipe wall of the outer pipe, and an anode mechanism is arranged on the insulating support; the inner pipe is a cathode mechanism; a sludge inlet of the sludge pump is in butt joint with a sludge outlet of the sludge gap water filtering mechanism, and a sludge outlet of the sludge pump is in butt joint with a sludge outlet of the sludge input mechanism;

the sludge dewatering system also comprises a base, a hanger, a lifting rope and a support column, wherein the lower end of the support column is connected to the base in a universal rotating manner, and the upper end of the support column is fixedly connected to the lower end of the sludge input mechanism; the hanging bracket is provided with a cylinder with a downward telescopic rod, and a rotating handle motor with a downward rotating shaft is fixedly connected to the telescopic rod of the cylinder; the rotating handle motor is not only positioned right above the base, but also positioned above the mud cake output mechanism; one end of a rocker is horizontally and fixedly connected to a rotating shaft of the handle motor, two ends of a lifting rope are respectively connected to the mud cake output mechanism and the other end of the rocker, and a control end of the cylinder and a control end of the handle motor are respectively connected with the microcontroller; the outer tube comprises a left column, a right column, a lower tube, an upper tube, a plurality of left semicircular sheets and right semicircular sheets with the number equal to that of the left semicircular sheets; the lower port of the lower pipe is connected with the sludge input mechanism, and the upper port of the upper pipe is connected with the sludge cake output mechanism; the upper end and the lower end of the left column are respectively connected with the lower pipe and the upper pipe, and the upper end and the lower end of the right column are also respectively connected with the lower pipe and the upper pipe; the left end of each left semicircular sheet is rotatably connected to the left column, and the right end of each left semicircular sheet is fixedly connected to the right column in a locking manner; the left end of each right semicircular sheet is also rotationally connected to the left column, the right end of each right semicircular sheet is also fixedly connected to the right column in a locking manner, and the left semicircular sheet and the right semicircular sheet are arranged in a one-to-one opposite arrangement; the insulating support comprises insulating blocks with the number equal to the number of the left semicircular blocks plus the number of the right semicircular blocks, and the insulating blocks are connected on the inner surface of the left semicircular block and the inner surface of the right semicircular block in a one-to-one mode; the anode mechanism comprises anode plates with the number of blocks equal to that of the insulating blocks; the inner surface of the insulating block is transversely provided with a guide groove, and the anode plates are fixedly connected in the guide groove of the insulating block in a one-to-one sliding manner; when the right end of each right semicircular sheet and the right end of each right semicircular sheet which are arranged oppositely are fixedly connected to the right column in a locking mode, an electrolytic cavity is formed between the anode plate corresponding to the left semicircular sheet and the insulating block of the right semicircular sheet.

2. The sludge dewatering system according to claim 1, further comprising a storage and a display, wherein an outer chute is provided on the blade portion of the screw conveyor blade along the blade portion of the screw conveyor blade, an inner chute is provided on an inner bottom surface of the outer chute along the outer chute, and a raceway groove having a diameter larger than a width of the inner chute is provided on the inner bottom surface of the inner chute along the inner chute; a pull wire is arranged in the wiring groove, a connecting rod is arranged in the inner sliding groove, a sliding block is arranged in the outer sliding groove, and the sliding block is fixedly connected to the pull wire through the connecting rod; the sliding block is detachably connected with a distance measuring instrument; an upper machine cavity communicated with the wiring groove is arranged in the inner pipe at the upper end of the inner pipe, a lower machine cavity communicated with the wiring groove is also arranged in the inner pipe at the lower end of the inner pipe, an upper winding motor is arranged in the upper machine cavity, a lower winding motor is arranged in the lower machine cavity, the upper end of a pull wire is fixedly connected to a rotating shaft of the upper winding motor, and the lower end of the pull wire is fixedly connected to a rotating shaft of the lower winding motor; the memory, the display, the distance measuring instrument, the control end of the lower winding motor and the control end of the upper winding motor are respectively connected with the microcontroller.