Underground pore-forming slurry extraction device and extraction method

By designing an underground mud extraction device that contains the slurry device and the scale rope, it solves the problem of accurate extraction of mud in the existing technology, and realizes the accurate extraction of the specified deep mud, ensuring the reliability of the foundation quality of the foundation. Essence

CN119354608APending Publication Date: 2025-01-24THE SECOND CONSTR OF CHINA CONSTR EIGHTH ENG DIV
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Patent Information

Application Number
CN202411651358.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-19
Publication Date
2025-01-24

AI Technical Summary

Technical Problem

The prior art is difficult to accurately extract underground pore-forming mud, resulting in the inability to effectively check the mud performance and affect the quality of the foundation.

Method used

An underground hole-forming mud extraction device including a pulp extraction bucket mechanism, a pulp extraction upper cover mechanism, a pulp extraction bottom cover mechanism and a scale rope is designed. Through the precise scale value of the scale rope, extraction can be performed at a specified depth. mud.

Benefits of technology

It achieves the precise extraction of mud at the specified depth, ensures the accuracy of mud performance inspection, and improves the reliability of foundation quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention belongs to the technical field of building construction, and particularly relates to an underground pore-forming slurry extracting device and method, the underground pore-forming slurry extracting device comprises a slurry taking device slurry taking barrel mechanism, a slurry taking device upper cover mechanism, a slurry taking device bottom cover mechanism and a scale rope, the upper end of the slurry taking device slurry taking barrel mechanism is attached to the slurry taking device upper cover mechanism, and the lower end of the slurry taking device bottom cover mechanism is attached to the scale rope; the lower end of the slurry taking device slurry taking barrel mechanism is attached to the slurry taking device bottom cover mechanism, the scale rope penetrates through the slurry taking device upper cover mechanism and the slurry taking device slurry taking barrel mechanism to be detachably connected with the slurry taking device bottom cover mechanism, and the slurry taking device slurry taking barrel mechanism and the slurry taking device upper cover mechanism are both in sliding connection with the scale rope in the vertical direction. Compared with the prior art, the device has the advantages and positive effects that the slurry at the specified depth can be accurately extracted, the accuracy of inspection and acceptance of the performance of the slurry is ensured, the quality of a foundation is ensured to meet the requirement, and the safety is improved.
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Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to an underground hole-forming mud extraction device and an extraction method. Background Art

[0002] Mud wall drilling is a commonly used foundation treatment process in construction projects. Usually, pile holes are formed in the foundation soil by mechanical drilling and other methods on the construction site, and steel cages are placed in the holes and concrete is poured to form piles. The mud performance after drilling is an important inspection basis for whether the quality of the drilling is qualified. However, during the mud performance inspection and acceptance, usually only the mud on the surface of the hole can be extracted manually, or by using traditional extraction devices, the hole is filled with surface mud when entering, and it cannot accurately reflect the quality of the drilling. If the mud performance is unqualified in the local area below and concrete is poured without inspection, it will seriously affect the quality of the foundation. Therefore, there is an urgent need for an underground drilling mud extraction device and extraction method that can accurately extract mud at a specified depth. Summary of the invention

[0003] In view of the above problems, the present invention provides an underground hole-forming mud extraction device and extraction method.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an underground drilling mud extraction device, comprising a slurry extractor slurry barrel mechanism, a slurry extractor upper cover mechanism, a slurry extractor bottom cover mechanism and a scale rope, the upper end of the slurry extractor slurry barrel mechanism is fitted with the slurry extractor upper cover mechanism, the lower end of the slurry extractor slurry barrel mechanism is fitted with the slurry extractor bottom cover mechanism, the scale rope passes through the slurry extractor upper cover mechanism and the slurry extractor slurry barrel mechanism and is detachably connected to the slurry extractor bottom cover mechanism, and the slurry extractor slurry barrel mechanism and the slurry extractor upper cover mechanism are both vertically slidably connected to the scale rope.

[0005] Preferably, the upper cover mechanism of the pulp extractor comprises an upper cover body, and an annular upper cover slot is provided on the upper cover body, and the upper cover body is connected with the pulp extractor barrel mechanism of the pulp extractor through the annular upper cover slot; The bottom cover mechanism of the pulp extractor comprises a bottom cover body, a bottom cover card slot is provided on the bottom cover body, and the bottom cover body is card-connected with the pulp extractor barrel mechanism through the bottom cover card slot.

[0006] Preferably, the slurry extractor upper cover mechanism also includes a hinge shaft, a one-way cover plate, a one-way cover counterweight and a one-way cover limit block. An upper cover unloading hole is also provided on the upper cover body. The one-way cover plate is hinged to the upper end of the upper cover body through a hinge shaft. The number of the one-way cover plate and the upper cover unloading holes is equal. The one-way cover counterweight is fixedly connected to the side of the upper end of the one-way cover plate away from the hinge shaft, and the one-way cover limit block is fixedly connected to the side of the upper end of the one-way cover plate close to the hinge shaft.

[0007] Preferably, the slurry extractor bottom cover mechanism also includes a one-way bottom cover plate, a bottom cover counterweight block and a bottom cover limit block. The bottom cover main body is provided with a bottom cover unloading hole. The one-way bottom cover plate is hinged to the upper end of the bottom cover main body. The number of the one-way bottom cover plate and the bottom cover unloading holes is equal. The bottom cover counterweight block is fixedly connected to the upper end of the one-way bottom cover plate. The bottom cover limit block is fixedly connected to the upper end of the one-way bottom cover plate.

[0008] Preferably, it also includes a conical counterweight drill bit, the upper end of which is detachably connected to the lower end of the bottom cover mechanism of the slurry extractor, and the conical counterweight drill bit is coaxial with the bottom cover mechanism of the slurry extractor.

[0009] Preferably, the upper cover mechanism of the slurry extractor also includes a counterweight limiting ring, a upper cover rope threading hole is provided on the upper cover body, the upper cover rope threading hole is coaxial with the counterweight limiting ring, the lower end of the counterweight limiting ring is detachably connected to the upper end of the upper cover body, and the inner surface of the counterweight limiting ring is in contact with the side of the scale rope.

[0010] Preferably, a bottom cover center threaded hole is opened in the center of the bottom cover body, the scale rope includes a scale rope body and a threaded portion, the lower end of the scale rope body is fixedly connected to the upper end of the threaded portion, and the threaded portion is threadedly connected to the bottom cover center threaded hole.

[0011] Preferably, the pulp taking device pulp taking barrel mechanism comprises a pulp taking barrel body, a sliding part and a support bar, the pulp taking barrel body and the sliding part are coaxial, the inner side surface of the pulp taking barrel body is fixedly connected to the outer side surface of the sliding part through the support bar, and the scale rope is in contact with the inner side surface of the sliding part.

[0012] Preferably, the sliding part comprises a sliding part body and a ball, the sliding part body and the ball are rotatably connected, and the scale rope is in contact with the ball.

[0013] A method for extracting underground borehole mud, using the underground borehole mud extraction device, comprises the following steps: Step 1: detachably connect the bottom cover mechanism of the pulp extractor to the scale rope, and then put the bottom cover mechanism of the pulp extractor and the scale rope into the slot hole to be extracted, and determine the lowering depth according to the scale value on the scale rope; Step 2: insert the pulp taking bucket mechanism of the pulp taking device into the scale rope, slide the pulp taking bucket mechanism of the pulp taking device down along the length direction of the scale rope to the bottom of the scale rope, and then fit the pulp taking bucket mechanism of the pulp taking device with the bottom cover mechanism of the pulp taking device; Step 3: Put the upper cover mechanism of the pulp extractor into the scale rope, and slide the upper cover mechanism of the pulp extractor down along the length direction of the scale rope, so that the upper cover mechanism of the pulp extractor fits with the upper end of the bottom cover mechanism of the pulp extractor; Step 4: Retract the scale rope, which will drive the bottom cover mechanism of the slurry extractor, and then drive the slurry extractor barrel mechanism and the upper cover mechanism of the slurry extractor to rise, completing the slurry extraction at the corresponding depth.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are: (1) The scale rope passes through the upper cover mechanism of the slurry extractor and the slurry extractor barrel mechanism and is detachably connected to the bottom cover mechanism of the slurry extractor. According to the scale of the scale rope, the mud at the specified depth can be accurately extracted, ensuring the accuracy of the mud performance inspection and acceptance, thereby ensuring that the foundation quality meets the requirements and improving safety; (2) The one-way upward cover is hinged to the upper end of the upper cover body, the one-way upward cover counterweight is fixedly connected to the upper end of the one-way upward cover, and the one-way upward cover limit block is fixedly connected to the upper end of the one-way upward cover. When the upper cover mechanism of the slurry extractor descends along the length direction of the scale rope as a whole, the one-way upward cover can be opened, so that part of the slurry flows out from the discharge hole of the upper cover, reducing the resistance of the upper cover mechanism of the slurry extractor as a whole during descent. When the upper cover mechanism of the slurry extractor rises as a whole, the one-way upward cover is subjected to downward pressure, and the one-way upward cover is fitted with the upper cover body. The one-way upward cover counterweight ensures a tight fit; (3) The upper end of the conical counterweight drill bit is detachably connected to the lower end of the bottom cover mechanism of the slurry extractor. The conical counterweight drill bit acts as a counterweight block on the one hand, and as a force unloading device on the other hand, thereby ensuring the smooth movement of the bottom cover mechanism of the slurry extractor and reducing the shaking during movement; (4) The rope threading hole of the upper cover is coaxial with the counterweight limit ring, and the lower end of the counterweight limit ring is detachably connected to the upper end of the upper cover body. On the one hand, the counterweight limit ring plays a counterweight role, so that the center of gravity of the upper cover mechanism coincides with the length direction of the scale rope, so that the slurry bucket mechanism, the slurry upper cover mechanism and the slurry bottom cover mechanism of the slurry taker are closely fitted. On the other hand, the counterweight limit ring plays a limiting role, reducing the amplitude of the upper cover mechanism shaking during the descent process, and the counterweight limit ring plays a guiding role, making the sliding smoother; (5) The sliding part body and the ball are connected in a rotating manner, and the scale rope fits the ball, changing the sliding friction into rolling friction, reducing the friction force and making the operation smoother; (6) The lower end of the counterweight limit ring is detachably connected to the upper end of the upper cover body. By replacing the counterweight limit rings with different inner diameters, the sliding speed can be adjusted for different muds to achieve smooth sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following is a brief introduction to the drawings required for describing the embodiment: Figure 1 This is the front view of the underground drilling mud extraction device; Figure 2 Stereoscopic view of underground drilling mud extraction device Figure 1 ; Figure 3 Stereoscopic view of underground drilling mud extraction device Figure 2 ; Figure 4 A three-dimensional view of a slurry extractor and slurry extractor barrel mechanism of an underground drilling mud extraction device; Figure 5 A three-dimensional view of the bottom cover mechanism of the slurry extractor of the underground drilling slurry extraction device; Figure 6 Stereoscopic view of the upper cover mechanism of the underground drilling mud extraction device Figure 1 ; Figure 7 Stereoscopic view of the upper cover mechanism of the underground drilling mud extraction device Figure 2 .

[0016] Reference numerals: 1—slurry taking device slurry taking barrel mechanism, 11—slurry taking barrel body, 12—sliding part, 13—support bar; 2—slurry extractor upper cover mechanism, 21—upper cover body, 22—annular upper cover slot, 23—upper cover discharge hole, 24—one-way cover plate, 25—counterweight limiting ring, 26—upper cover rope threading hole, 27—one-way cover counterweight block, 28—one-way cover limiting block; 3—bottom cover mechanism of the pulp extractor, 31—bottom cover body, 32—bottom cover slot, 33—bottom cover discharge hole, 34—one-way bottom cover plate, 35—bottom cover center threaded hole, 36—bottom cover counterweight, 37—bottom cover limit block; 4—Graduation rope; 5—Conical weight drill bit. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0019] Example 1 Combine the following Figures 1 to 7 Specifically describe the underground hole-forming mud extraction device and extraction method, such as Figure 1 , Figure 2 and Figure 3As shown, an underground hole-forming mud extraction device comprises a slurry extractor slurry extractor barrel mechanism 1, a slurry extractor upper cover mechanism 2, a slurry extractor bottom cover mechanism 3 and a scale rope 4, the upper end of the slurry extractor slurry extractor barrel mechanism 1 is fitted with the slurry extractor upper cover mechanism 2, the lower end of the slurry extractor slurry extractor barrel mechanism 1 is fitted with the slurry extractor bottom cover mechanism 3, the scale rope 4 passes through the slurry extractor upper cover mechanism 2 and the slurry extractor slurry extractor barrel mechanism 1 and is detachably connected to the slurry extractor bottom cover mechanism 3, and the slurry extractor slurry extractor barrel mechanism 1 and the slurry extractor upper cover mechanism 2 are both vertically slidably connected to the scale rope 4.

[0020] like Figure 6 and Figure 7 As shown, the upper cover mechanism 2 of the pulp extractor comprises an upper cover body 21 , on which an annular upper cover slot 22 is formed, and the upper cover body 21 is connected to the pulp extractor barrel mechanism 1 through the annular upper cover slot 22 .

[0021] like Figure 1 and Figure 5 As shown, the bottom cover mechanism 3 of the pulp extractor comprises a bottom cover body 31 , on which a bottom cover slot 32 is formed, and the bottom cover body 31 is connected to the pulp extractor barrel mechanism 1 through the bottom cover slot 32 .

[0022] like Figure 6 and Figure 7 As shown, the pulp extractor upper cover mechanism 2 also includes a hinge shaft, a one-way cover plate 24, a one-way cover counterweight 27 and a one-way cover limit block 28. An upper cover discharge hole 23 is also provided on the upper cover body 21. The one-way cover plate 24 is hinged to the upper end of the upper cover body 21 through a hinge shaft. The number of the one-way cover plates 24 and the upper cover discharge holes 23 are equal. The one-way cover counterweight 27 is fixedly connected to the side of the upper end of the one-way cover plate 24 away from the hinge shaft, and the one-way cover limit block 28 is fixedly connected to the side of the upper end of the one-way cover plate 24 close to the hinge shaft.

[0023] like Figure 5 As shown, the pulp extractor bottom cover mechanism 3 also includes a one-way bottom cover plate 34, a bottom cover counterweight block 36 and a bottom cover limit block 37. A bottom cover discharge hole 33 is opened on the bottom cover body 31. The one-way bottom cover plate 34 is hinged to the upper end of the bottom cover body 31. The number of the one-way bottom cover plates 34 and the bottom cover discharge holes 33 is equal. The bottom cover counterweight block 36 is fixedly connected to the upper end of the one-way bottom cover plate 34. The bottom cover limit block 37 is fixedly connected to the upper end of the one-way bottom cover plate 34.

[0024] like Figure 1 As shown, it also includes a conical counterweight drill bit 5, the upper end of the conical counterweight drill bit 5 is detachably connected to the lower end of the bottom cover mechanism 3 of the slurry extractor, and the conical counterweight drill bit 5 and the bottom cover mechanism 3 of the slurry extractor are coaxial.

[0025] like Figure 6As shown, the slurry extractor upper cover mechanism 2 also includes a counterweight limiting ring 25, and an upper cover rope threading hole 26 is opened on the upper cover body 21. The upper cover rope threading hole 26 is coaxial with the counterweight limiting ring 25, and the lower end of the counterweight limiting ring 25 is detachably connected to the upper end of the upper cover body 21, and the inner surface of the counterweight limiting ring 25 is in contact with the side of the scale rope 4.

[0026] like Figure 5 As shown, a bottom cover center threaded hole 35 is opened in the center of the bottom cover body 31, and the scale rope 4 includes a scale rope body and a threaded portion. The lower end of the scale rope body is fixedly connected to the upper end of the threaded portion, and the threaded portion is threadedly connected to the bottom cover center threaded hole 35.

[0027] like Figure 4 As shown, the pulp taking barrel mechanism 1 of the pulp taking device includes a pulp taking barrel body 11, a sliding part 12 and a support bar 13. The pulp taking barrel body 11 and the sliding part 12 are coaxial, and the inner side surface of the pulp taking barrel body 11 is fixedly connected to the outer side surface of the sliding part 12 through the support bar 13, and the scale rope 4 is in contact with the inner side surface of the sliding part 12.

[0028] The sliding part 12 includes a sliding part body and a ball, the sliding part body and the ball are rotatably connected, and the scale rope 4 is in contact with the ball.

[0029] A method for extracting underground drilling mud, using an underground drilling mud extraction device, comprises the following steps: Step 1: detachably connect the bottom cover mechanism 3 of the pulp extractor to the scale rope 4, and then put the bottom cover mechanism 3 of the pulp extractor and the scale rope 4 into the slot hole to be extracted, and determine the lowering depth according to the scale value on the scale rope 4; Step 2: insert the pulp taking barrel mechanism 1 of the pulp taking device into the scale rope 4, slide the pulp taking barrel mechanism 1 of the pulp taking device down along the length direction of the scale rope 4 to the bottom of the scale rope 4, and then fit the pulp taking barrel mechanism 1 of the pulp taking device with the bottom cover mechanism 3 of the pulp taking device; Step 3: Insert the upper cover mechanism 2 of the pulp extractor into the scale rope 4, and slide the upper cover mechanism 2 of the pulp extractor down along the length direction of the scale rope 4, so that the upper cover mechanism 2 of the pulp extractor fits with the upper end of the bottom cover mechanism 3 of the pulp extractor; Step 4: Retract the scale rope 4, which drives the bottom cover mechanism 3 of the slurry extractor, and then drives the slurry extractor barrel mechanism 1 and the slurry extractor upper cover mechanism 2 to rise, completing the corresponding depth slurry extraction.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An underground hole-forming mud extraction device, characterized in that: The invention comprises a pulp taking device pulp taking barrel mechanism (1), a pulp taking device upper cover mechanism (2), a pulp taking device bottom cover mechanism (3) and a scale rope (4); the upper end of the pulp taking barrel mechanism (1) is fitted with the pulp taking device upper cover mechanism (2); the lower end of the pulp taking barrel mechanism (1) is fitted with the pulp taking device bottom cover mechanism (3); the scale rope (4) passes through the pulp taking device upper cover mechanism (2) and the pulp taking barrel mechanism (1) and is detachably connected to the pulp taking device bottom cover mechanism (3); the pulp taking barrel mechanism (1) and the pulp taking device upper cover mechanism (2) are both vertically slidably connected to the scale rope (4).

2. The underground drilling mud extraction device according to claim 1, characterized in that: The pulp extractor upper cover mechanism (2) comprises an upper cover body (21), an annular upper cover clamping groove (22) is provided on the upper cover body (21), and the upper cover body (21) is clamped with the pulp extractor pulp extracting barrel mechanism (1) via the annular upper cover clamping groove (22); The pulp extractor bottom cover mechanism (3) comprises a bottom cover body (31), the bottom cover body (31) is provided with a bottom cover clamping slot (32), and the bottom cover body (31) is clamped with the pulp extractor pulp extractor barrel mechanism (1) via the bottom cover clamping slot (32).

3. The underground drilling mud extraction device according to claim 2, characterized in that: The pulp extractor upper cover mechanism (2) further comprises a hinge shaft, a one-way cover plate (24), a one-way cover counterweight (27) and a one-way cover stop block (28); an upper cover discharge hole (23) is also provided on the upper cover body (21); the one-way cover plate (24) is hinged to the upper end of the upper cover body (21) via the hinge shaft; the one-way cover plate (24) and the upper cover discharge holes (23) are equal in number; the one-way cover counterweight (27) is fixedly connected to a side of the upper end of the one-way cover plate (24) away from the hinge shaft; and the one-way cover stop block (28) is fixedly connected to a side of the upper end of the one-way cover plate (24) close to the hinge shaft.

4. The underground drilling mud extraction device according to claim 2, characterized in that: The pulp extractor bottom cover mechanism (3) further comprises a one-way bottom cover plate (34), a bottom cover counterweight (36) and a bottom cover stop block (37); a bottom cover discharge hole (33) is provided on the bottom cover body (31); the one-way bottom cover plate (34) is hinged to the upper end of the bottom cover body (31); the one-way bottom cover plate (34) and the bottom cover discharge hole (33) are equal in number; the bottom cover counterweight (36) is fixedly connected to the upper end of the one-way bottom cover plate (34); and the bottom cover stop block (37) is fixedly connected to the upper end of the one-way bottom cover plate (34).

5. The underground drilling mud extraction device according to claim 1, characterized in that: It also comprises a conical counterweight drill bit (5), the upper end of the conical counterweight drill bit (5) being detachably connected to the lower end of the slurry extractor bottom cover mechanism (3), and the conical counterweight drill bit (5) and the slurry extractor bottom cover mechanism (3) being coaxial.

6. The underground drilling mud extraction device according to claim 2, characterized in that: The slurry extractor upper cover mechanism (2) further comprises a counterweight limiting ring (25); an upper cover rope threading hole (26) is provided on the upper cover body (21); the upper cover rope threading hole (26) is coaxial with the counterweight limiting ring (25); the lower end of the counterweight limiting ring (25) is detachably connected to the upper end of the upper cover body (21); and the inner side surface of the counterweight limiting ring (25) is in contact with the side surface of the scale rope (4).

7. The underground drilling mud extraction device according to claim 2, characterized in that: A bottom cover central threaded hole (35) is provided at the center of the bottom cover body (31); the graduation rope (4) comprises a graduation rope body and a threaded portion; the lower end of the graduation rope body is fixedly connected to the upper end of the threaded portion; and the threaded portion is threadedly connected to the bottom cover central threaded hole (35).

8. The underground drilling mud extraction device according to claim 1, characterized in that: The pulp taking device pulp taking barrel mechanism (1) comprises a pulp taking barrel body (11), a sliding part (12) and a support bar (13); the pulp taking barrel body (11) and the sliding part (12) are coaxial; the inner side surface of the pulp taking barrel body (11) is fixedly connected to the outer side surface of the sliding part (12) via the support bar (13); and the scale rope (4) is in contact with the inner side surface of the sliding part (12).

9. The underground drilling mud extraction device according to claim 8, characterized in that: The sliding part (12) comprises a sliding part body and a ball bearing, the sliding part body and the ball bearing are rotatably connected, and the scale rope (4) is in contact with the ball bearing.

10. A method for extracting underground borehole mud, using the underground borehole mud extraction device according to claim 3, characterized in that: The steps include: Step 1: The bottom cover mechanism (3) of the pulp extractor is detachably connected to the graduated rope (4), and then the bottom cover mechanism (3) of the pulp extractor and the graduated rope (4) are placed into the slot hole to be extracted, and the lowering depth is determined according to the graduated value on the graduated rope (4); Step 2: insert the pulp taking bucket mechanism (1) of the pulp taking device into the scale rope (4), slide the pulp taking bucket mechanism (1) of the pulp taking device down along the length direction of the scale rope (4) to the bottom of the scale rope (4), and then fit the pulp taking bucket mechanism (1) of the pulp taking device with the bottom cover mechanism (3) of the pulp taking device; Step 3: insert the upper cover mechanism (2) of the pulp extractor into the scale rope (4), and slide the upper cover mechanism (2) of the pulp extractor down along the length direction of the scale rope (4), so that the upper cover mechanism (2) of the pulp extractor fits the upper end of the bottom cover mechanism (3) of the pulp extractor; Step 4: Retract the scale rope (4), and the scale rope (4) drives the bottom cover mechanism (3) of the pulp extractor, thereby driving the pulp extractor barrel mechanism (1) and the pulp extractor upper cover mechanism (2) to rise, thereby completing the pulp extraction at the corresponding depth.