Underwater mud scraper limiting device

Abstract

The utility model provides an underwater mud scraper limiting device, which relates to the technical field of mud scrapers, and comprises a sedimentation tank body, a rotating stand column is arranged on the inner bottom wall of the sedimentation tank body, a scraping arm is fixedly connected to the upper end of the rotating stand column, a detection sleeve is fixedly connected to the lower surface of the scraping arm, and a touch switch is fixedly mounted on the inner wall of one side of the detection sleeve. The inner wall of the detection sleeve is fixedly sleeved with a partition plate, the inner wall of the partition plate is fixedly sleeved with an air guide pipe, through the buffering and limiting device, elastic buffering and rolling contact are achieved, the contact friction with an arc-shaped protruding block during limiting contact is reduced, and therefore the purposes of reducing abrasion and prolonging the service life are achieved; therefore, the operation difficulty during maintenance in water is avoided, and poor limiting contact caused by deformation of the scraper is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mud scrapers, in particular to a limiting device for underwater mud scrapers. Background Art

[0002] A sludge scraper is a machine that removes sludge from rivers. It is used in large-diameter circular sedimentation tanks in municipal sewage treatment plants, waterworks, and industrial wastewater treatment to remove sludge that has settled at the bottom of the tank. During sewage treatment, workers typically use sedimentation tanks to flocculate and settle the sewage. After flocculation, solid pollutants settle to the bottom of the tank. At this time, the scraper's drive device drives the scraper arm and scraper blade to rotate or move. The scraper blade contacts the bottom of the sedimentation tank and scrapes the settled sludge toward a specific sludge outlet or sludge collection device. During the scraping process, the scraper usually operates at a slow speed to ensure that the sludge is effectively scraped without causing resuspension. Among them, a center-drive scraper consists of a central rotating column, scraper arms, scraper blades, and a drive device. The central rotating column is located at the center of the sedimentation tank, and the scraper arms extend from the center to the periphery. The scraper blades are mounted at the bottom of the scraper arms. The drive device is usually located at or near the top of the central rotating column, providing rotational power for the scraper.

[0003] Existing center-drive scrapers usually have a limit device installed underwater to prevent the scraper from continuing to rotate due to electrical failure, mechanical loss of control, etc., which may cause the scraper arm to collide with the pool wall. However, the current limit device is usually installed at the end of the underwater scraper blade. Since the water quality in the sedimentation tank is highly corrosive and the scraper blade is easily deformed due to long-term accumulation of silt, it is easy to cause poor contact of the limit device, which in turn causes scraping and wear between the scraper blade and the inner wall of the sedimentation tank, increasing maintenance costs.

[0004] Therefore, we propose a limiting device for underwater scraper. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art. At present, a center-drive scraper is usually installed with a limit device underwater to prevent the scraper from continuing to rotate due to electrical failure, mechanical loss of control, etc., which causes the scraper arm to collide with the pool wall. However, the current limit device is usually installed at the end of the underwater scraper. Since the water quality in the sedimentation tank is highly corrosive and the scraper is easily deformed due to long-term accumulation of silt, it is easy to cause poor contact of the limit device, which in turn causes scraping and wear between the scraper and the inner wall of the sedimentation tank, increasing the maintenance cost.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A limit device for an underwater scraper comprises a sedimentation tank body, wherein the inner bottom wall of the sedimentation tank body is provided with a rotating column, the upper end of the rotating column is fixedly connected to a scraper arm, the lower surface of the scraper arm is fixedly connected to a detection sleeve, a touch switch is fixedly installed on the inner wall of one side of the detection sleeve, a partition is fixedly sleeved on the inner wall of the detection sleeve, and an air guide tube is fixedly sleeved on the inner wall of the partition;

[0008] One end of the air guide tube is provided with a buffering and limiting device, and the buffering and limiting device includes a telescopic airbag, and one side surface of the telescopic airbag is fixedly connected to one end of the air guide tube.

[0009] Preferably, one side surface of the telescopic airbag is fixedly mounted to one side surface of the partition, the air guide tube passes through and extends to the other side surface of the partition, and a piston block is movably sleeved on the inner wall of the air guide tube.

[0010] Preferably, one side surface of the piston block is fixedly connected to an extrusion rod, the outer surface of the air guide tube is movably sleeved with a support spring, and one end of the support spring is fixedly connected to the other side surface of the partition.

[0011] Preferably, the other end of the support spring is fixedly connected to a buffer block, one side surface of the buffer block is fixedly connected to one end of the extrusion rod, and the outer surface of the buffer block is movably connected to the inner wall of the detection sleeve.

[0012] Preferably, a sliding ball groove is provided on the other side surface of the buffer block, a rotating sliding ball is slidably sleeved on the inner wall of the sliding ball groove, the outer surface of the rotating sliding ball contacts the inner wall of the sedimentation tank body, and the inner bottom wall and the inner top wall of the detection sleeve are provided with symmetrically distributed guide grooves.

[0013] Preferably, the inner wall of the guide chute is slidably connected with a guide slider, the opposite surfaces of the two guide sliders are fixedly connected to the upper surface and the lower surface of the buffer block respectively, and the inner wall of the sedimentation tank body is fixedly connected with an arc-shaped protrusion.

[0014] Preferably, the lower surface of the scraper arm is fixedly connected with connecting rods distributed in a linear array, one end of each of the connecting rods is fixedly connected with a scraper, and the lower end of the scraper is in contact with the inner bottom wall of the sedimentation tank body.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] In the utility model, the buffer limit device is used to achieve elastic buffering and rolling contact, thereby reducing the contact friction with the arc-shaped protrusion during limiting contact, thereby reducing wear and extending service life. By installing it under the scraper arm, the difficulty of operation during maintenance in water is avoided, and the effect of poor limiting contact caused by deformation of the scraper is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of a limiting device for an underwater scraper provided by the utility model;

[0018] Figure 2 A three-dimensional diagram of the detection sleeve structure of a limit device for an underwater scraper provided by the utility model;

[0019] Figure 3 This is an exploded diagram of the buffer block structure of a limiting device for an underwater scraper provided by the utility model;

[0020] Figure 4 This is a three-dimensional diagram of the air guide pipe structure of the underwater scraper limiting device provided by the utility model.

[0021] Legend: 1. Sedimentation tank body; 2. Rotating column; 3. Scraper arm; 4. Detection sleeve; 5. Touch switch; 6. Partition; 7. Air guide tube; 8. Telescopic air bag; 81. Piston block; 82. Extrusion rod; 83. Support spring; 84. Buffer block; 85. Sliding ball groove; 86. Rotating sliding ball; 87. Guide slide groove; 88. Guide slider; 89. Arc-shaped protrusion; 9. Connecting rod; 10. Scraper. DETAILED DESCRIPTION

[0022] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to relevant references, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] Example 1

[0027] like Figure 1-4 As shown, the utility model provides a technical solution: an underwater scraper limiting device, comprising a sedimentation tank body 1, a rotating column 2 is provided on the inner bottom wall of the sedimentation tank body 1, a scraping arm 3 is fixedly connected to the upper end of the rotating column 2, a detection sleeve 4 is fixedly connected to the lower surface of the scraping arm 3, a touch switch 5 is fixedly installed on the inner wall of one side of the detection sleeve 4, a partition 6 is fixedly sleeved on the inner wall of the detection sleeve 4, and an air guide pipe 7 is fixedly sleeved on the inner wall of the partition 6;

[0028] One end of the air guide tube 7 is provided with a buffering and limiting device, and the buffering and limiting device includes a telescopic airbag 8 , and one side surface of the telescopic airbag 8 is fixedly connected to one end of the air guide tube 7 .

[0029] Example 2

[0030] like Figure 1-4 As shown, the utility model provides a technical solution: one side surface of the telescopic airbag 8 is fixedly installed on the one side surface of the partition 6, the air guide tube 7 passes through and extends to the other side surface of the partition 6, and the inner wall of the air guide tube 7 is movably connected with a piston block 81. The movement of the piston block 81 plays a role in inputting and extracting the gas in the telescopic airbag 8 through the air guide tube 7.

[0031] One side surface of the piston block 81 is fixedly connected to an extrusion rod 82, and the outer surface of the air guide tube 7 is movably sleeved with a support spring 83. One end of the support spring 83 is fixedly connected to the other side surface of the partition 6. The elastic force of the support spring 83 drives the piston block 81 to reset and move through the extrusion rod 82.

[0032] The other end of the support spring 83 is fixedly connected to a buffer block 84. One side surface of the buffer block 84 is fixedly connected to one end of the extrusion rod 82. The outer surface of the buffer block 84 is movably connected to the inner wall of the detection sleeve 4. The movement of the buffer block 84 drives the support spring 83 to be squeezed and contracted.

[0033] A sliding ball groove 85 is provided on the other side surface of the buffer block 84, and a rotating sliding ball 86 is slidably sleeved on the inner wall of the sliding ball groove 85. The outer surface of the rotating sliding ball 86 contacts the inner wall of the sedimentation tank body 1, and the inner bottom wall and the inner top wall of the detection sleeve 4 are provided with symmetrically distributed guide sliding grooves 87. The rotating sliding ball 86 rotates in the sliding ball groove 85, thereby reducing the contact friction.

[0034] The inner wall of the guide groove 87 is slidably connected to a guide slider 88, and the opposite surfaces of the two guide sliders 88 are fixedly connected to the upper surface and lower surface of the buffer block 84 respectively. The inner wall of the sedimentation tank body 1 is fixedly connected to an arc-shaped protrusion 89. The guide groove 87 and the guide slider 88 cooperate with the buffer block 84 for stable movement, and have the function of limiting the moving stroke of the buffer block 84.

[0035] The lower surface of the scraper arm 3 is fixedly connected to connecting rods 9 distributed in a linear array, and one end of multiple connecting rods 9 is fixedly connected to a scraper 10. The lower end of the scraper 10 contacts the inner bottom wall of the sedimentation tank body 1. The rotation of the scraper arm 3 drives the scraper 10 to rotate in a circle through the connecting rod 9.

[0036] Through the buffer limit device, elastic buffering and rolling contact are achieved, which reduces the contact friction with the arc-shaped protrusion 89 during the limiting contact, thereby reducing wear and extending the service life. By installing it under the scraper arm 3, the difficulty of operation during maintenance in water is avoided, and the effect of poor limiting contact caused by deformation of the scraper 10 is avoided.

[0037] The working process of this utility model:

[0038] Step 1: By connecting the touch switch 5 with the external PLC controller and the motor for driving the rotating column 2, the number of scraping circles can be set according to the need. Each time the touch switch 5 is touched, a count is performed. When the total count reaches the set number of circles, the rotation of the rotating column 2 is stopped, thereby achieving accurate limit entry;

[0039] In step 2, the rotation of the rotating column 2 drives the scraper 10 to scrape the sludge at the bottom of the sedimentation tank body 1 through the scraper arm 3 and the connecting rod 9, and the rotation of the scraper arm 3 drives the buffer block 84 to rotate in a circle through the detection sleeve 4. The rotation of the buffer block 84 rotates the sliding ball 86 through the sliding ball groove 85, thereby reducing the contact friction with the inner wall of the sedimentation tank body 1;

[0040] Step 3: When the rotating ball 86 contacts the arc-shaped protrusion 89, it is squeezed by the arc surface of the arc-shaped protrusion 89, causing the rotating ball 86 to drive the buffer block 84 to move. The cooperation between the guide slider 88 and the guide groove 87 allows the buffer block 84 to move stably, and the extrusion rod 82 squeezes and moves the piston block 81. At this time, the support spring 83 is squeezed and contracted. The movement of the piston block 81 squeezes the gas in the air guide tube 7, causing the gas to be transported to the inside of the telescopic airbag 8. After receiving the gas input, the telescopic airbag 8 expands and extends, so that one end of the telescopic airbag contacts and fits with the touch switch 5.

[0041] In step 4, the touch switch 5 transmits the single contact signal to the PLC controller for counting. When the total number of times is reached, the motor stops working. When the total number of times is not reached, it continues to work. At this time, the buffer block 84 rotates to disengage from the arc-shaped protrusion 89, and the elastic force of the support spring 83 drives the buffer block 84 to reset and move. The reset movement of the buffer block 84 cooperates with the movement of the extrusion rod 82 and the piston block 81 to extract the gas inside the telescopic airbag 8 through the air guide tube 7. At this time, the telescopic airbag 8 retracts and then breaks away from the contact with the touch switch 5.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A limit device for an underwater scraper, comprising a sedimentation tank body (1), characterized in that: The inner bottom wall of the sedimentation tank body (1) is provided with a rotating column (2), the upper end of the rotating column (2) is fixedly connected to a scraper arm (3), the lower surface of the scraper arm (3) is fixedly connected to a detection sleeve (4), a touch switch (5) is fixedly installed on the inner wall of one side of the detection sleeve (4), a partition (6) is fixedly sleeved on the inner wall of the detection sleeve (4), and an air guide pipe (7) is fixedly sleeved on the inner wall of the partition (6); One end of the air guide tube (7) is provided with a buffering and limiting device, and the buffering and limiting device includes a telescopic air bag (8), and a side surface of the telescopic air bag (8) is fixedly connected to one end of the air guide tube (7).

2. The underwater scraper limiting device according to claim 1, characterized in that: One side surface of the telescopic airbag (8) is fixedly mounted to one side surface of the partition (6), the air guide tube (7) passes through and extends to the other side surface of the partition (6), and the inner wall of the air guide tube (7) is movably sleeved with a piston block (81).

3. The underwater scraper limiting device according to claim 2, characterized in that: A squeeze rod (82) is fixedly connected to one side surface of the piston block (81), a support spring (83) is movably sleeved on the outer surface of the air guide tube (7), and one end of the support spring (83) is fixedly connected to the other side surface of the partition (6).

4. The underwater scraper limiting device according to claim 3, characterized in that: The other end of the support spring (83) is fixedly connected to a buffer block (84), one side surface of the buffer block (84) is fixedly connected to one end of the extrusion rod (82), and the outer surface of the buffer block (84) is movably sleeved with the inner wall of the detection sleeve (4).

5. The underwater scraper limiting device according to claim 4, characterized in that: A sliding ball groove (85) is provided on the other side surface of the buffer block (84), and a rotating sliding ball (86) is slidably sleeved on the inner wall of the sliding ball groove (85). The outer surface of the rotating sliding ball (86) contacts the inner wall of the sedimentation tank body (1). The inner bottom wall and the inner top wall of the detection sleeve (4) are provided with symmetrically distributed guide sliding grooves (87).

6. The underwater sludge scraper limiting device according to claim 5, characterized in that: The inner wall of the guide chute (87) is slidably connected to a guide slider (88), and the opposing surfaces of the two guide sliders (88) are fixedly connected to the upper surface and the lower surface of the buffer block (84), respectively. The inner wall of the sedimentation tank body (1) is fixedly connected to an arc-shaped protrusion (89).

7. The underwater scraper limiting device according to claim 1, characterized in that: The lower surface of the scraper arm (3) is fixedly connected to connecting rods (9) distributed in a linear array, and one end of each of the connecting rods (9) is fixedly connected to a scraper (10), and the lower end of the scraper (10) is in contact with the inner bottom wall of the sedimentation tank body (1).

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