Water seal structure at tail end of material pushing rod

Abstract

The utility model relates to a water seal structure at the tail end of a material pushing rod, and belongs to the field of drilling of soil layers or rocks. The structure comprises a driving shaft, a material pushing rod, a material pushing pressing plate and a material pushing rod fixing sleeve. The tail end of the material pushing rod is inserted into a shaft hole of the driving shaft, an annular groove is formed in the periphery of the material pushing rod, and the material pushing pressing plate is correspondingly clamped and embedded in the annular groove; a sealing ring is clamped between the end face of the tail end of the material pushing rod and the bottom face of a shaft hole of the driving shaft, the material pushing pressing plate and the driving shaft are sleeved with the material pushing rod fixing sleeve, the material pushing rod fixing sleeve is provided with a partition part used for abutting against the material pushing pressing plate, and the material pushing rod fixing sleeve and the driving shaft are screwed through threads so that the material pushing pressing plate can drive the material pushing rod to abut against the sealing ring. The structure adopts end face sealing, not only has good sealing performance, but also prolongs the service life of a sealing piece, guarantees the water supply efficiency, and is an ideal choice especially in occasions needing long service life, high-speed rotation and high-pressure sealing.

Description

Technical Field

[0001] This utility model belongs to the field of drilling in soil or rock, and specifically relates to a water seal structure at the tail end of a push rod. Background Technology

[0002] When performing core drilling operations using water-cooled drills, the problem of residual rock cores inside the drill barrel often arises. To solve this problem, a push rod is specially installed inside the drill barrel to push out the residual rock cores. In addition, the push rod also serves as a water inlet, responsible for supplying water into the drill barrel. The water inlet is designed inside the drive shaft. When the push rod is installed and engaged with the drive shaft, the water can flow smoothly through the water inlet of the push rod and ultimately into the drill barrel.

[0003] In existing technologies, the installation and fit between the push rod and the drive shaft still suffers from sealing problems; improper sealing can easily lead to water leakage. Chinese Patent Application No. 2024202865081 discloses a water supply sealing structure within a drilling rig drive shaft. This structure uses countersunk platforms on the drive shaft and push rod to install sealing rings, and controls the dimensional relationship between the sealing ring, the countersunk platforms on the drive shaft, and the push rod to ensure the sealing ring is always in the correct position. Simultaneously, fasteners are used to secure the clamping plate and pressure plate, naturally compressing the sealing ring and achieving a sealing effect. However, in actual use, it has been found that when the push rod rotates at high speed, the resulting vibration and partial axial force can easily damage the sealing ring due to its sharp internal parts. This leads to a shortened service life of the sealing ring and unreliable sealing performance. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a water seal structure at the tail end of the push rod to solve the shortcomings of the current water supply sealing structure.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A push rod tail end water seal structure includes a drive shaft 1, a push rod 2, a push plate 3, and a push rod fixing sleeve 4. The tail end of the push rod 2 is inserted into the shaft hole of the drive shaft 1, and an anti-rotation structure is provided between the push rod 2 and the drive shaft 1 to prevent circumferential rotation between the push rod 2 and the drive shaft 1. An annular groove is provided on the outer periphery of the push rod 2, and the push plate 3 is correspondingly embedded in the annular groove. A sealing ring 5 is sandwiched between the end face of the tail end of the push rod 2 and the bottom surface of the shaft hole of the drive shaft 1. The push rod fixing sleeve 4 is sleeved on the push plate 3 and the drive shaft 1, and the push rod fixing sleeve 4 has a partition part 401 for pressing the push plate 3. The push rod fixing sleeve 4 and the drive shaft 1 are screwed together so that the push plate 3 drives the push rod 2 to press against the sealing ring 5.

[0007] Furthermore, the minor diameter of the thread on the push rod fixing sleeve 4 is greater than the outer diameter of the push plate 3.

[0008] Furthermore, the pusher plate 3 has a slot that matches the partition part 401 on the pusher rod fixing sleeve 4.

[0009] Furthermore, the sealing ring 5 is made of rubber.

[0010] Furthermore, the drive shaft 1 has a water inlet 101 and the water inlet 101 is connected to the shaft hole.

[0011] Furthermore, the push rod 2 is provided with a water passage inner hole 201, and the water flowing into the water inlet 101 flows into the water passage inner hole 201 through the through hole 102 at the bottom of the shaft hole.

[0012] Furthermore, the anti-rotation structure is a key that is fitted between the shaft hole of the drive shaft 1 and the outer periphery of the push rod 2. The key is a flat key or a spline.

[0013] The beneficial effects of this utility model are as follows:

[0014] (1) Improved sealing performance. By tightening the thread between the push rod fixing sleeve and the drive shaft, the push plate drives the push rod to move towards the bottom surface of the drive shaft hole, making the distance S1 between the end face of the push rod and the bottom surface of the drive shaft hole less than the thickness S2 of the sealing ring, thereby achieving the effect of pressing the sealing ring. This "end face seal" design, which utilizes the mutual contact and pressing of two planes, ensures that water flow will not leak from the gap between the push rod and the drive shaft, providing reliable sealing protection.

[0015] (2) Easy to maintain and adjust. The end face seal is characterized by its simple and compact structure, and ease of installation and disassembly. When the sealing ring needs to be replaced, it can be easily disassembled and replaced simply by loosening the push rod fixing sleeve. In addition, the tightness of the seal can be easily controlled by adjusting the clamping force to adapt to different working pressures and fluid media.

[0016] (3) Improved service life of the seal. The seal is subjected to uniform pressure from the end face of the push rod and the bottom face of the drive shaft hole. This uniform pressure helps reduce local wear and deformation of the seal, thereby extending its service life.

[0017] (4) It has significant advantages in application under high-speed rotation of the push rod. Compared with other types of seals, the end face seal has a relatively large contact area and a low relative movement speed between the contact surfaces (mainly axial movement rather than rotational movement). Therefore, the end face seal generates less frictional heat and wear when the push rod rotates at high speed. In addition, the end face seal can maintain a stable sealing effect when the push rod rotates at high speed. This is because the sealing ring is tightly pressed between the end face of the push rod and the bottom surface of the shaft hole of the drive shaft, and it is not easy to loosen or displace due to rotation.

[0018] In summary, the push rod tail end water seal structure adopts end face sealing, which is simple in structure, easy to install, not only has good sealing performance, but also extends the service life of the sealing element and ensures water supply efficiency. It is an ideal choice, especially in occasions that require long service life, high speed rotation and high pressure sealing.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Reference numerals in the attached drawings: 1—drive shaft, 101—water inlet, 102—through hole; 2—push rod, 201—water inlet; 3—push plate, 4—push rod fixing sleeve, 401—partition; 5—sealing ring. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] Please see Figure 1 This is a push rod tail end water seal structure, including a drive shaft 1, a push rod 2, a push plate 3, and a push rod fixing sleeve 4. The drive shaft 1 has a water inlet 101 and a shaft hole. The shaft hole is located at the front end of the drive shaft 1 for mounting the push rod 2. A through hole 102 is formed on the bottom surface of the shaft hole to connect the shaft hole and the water inlet 101. The tail end of the push rod 2 is inserted into the shaft hole of the drive shaft 1, and an anti-rotation structure is matched between the push rod 2 and the drive shaft 1 to prevent circumferential rotation between the push rod 2 and the drive shaft 1. A water passage inner hole 201 is also formed on the push rod 2, allowing water to flow into the water passage inner hole 201 through the water inlet 101 and the through hole 102. An annular groove is formed on the outer periphery of the push rod 2 (located outside the shaft hole), and the push plate 3 is correspondingly embedded in the annular groove. The front end of the drive shaft 1 has a threaded section on its outer periphery that mates with the push rod fixing sleeve 4. The push rod fixing sleeve 4 is sequentially fitted over the push plate 3 and the front end of the drive shaft 1, and has a partition 401 on the push plate 3 for pressing against it. A sealing ring 5 is sandwiched between the end face of the push rod 2 and the bottom surface of the shaft hole of the drive shaft 1. The push rod fixing sleeve 4 is screwed onto the drive shaft 1, so that the push plate 3 drives the push rod 2 to move towards the bottom surface of the shaft hole of the drive shaft 1, thereby making the distance S1 between the end face of the push rod 2 and the bottom surface of the shaft hole of the drive shaft 1 less than the thickness S2 of the sealing ring 5, thus achieving the effect of pressing the sealing ring 5.

[0027] In this embodiment, the minor diameter of the thread on the inner side of the push rod fixing sleeve 4 is larger than the outer diameter of the push plate 3 to ensure that the push rod fixing sleeve 4 can pass smoothly through the push plate 3. The push plate 3 here consists of two semi-circular rings for easy assembly.

[0028] In this embodiment, the pusher plate 3 has a slot that matches the partition 401 on the pusher rod fixing sleeve 4. In this way, after assembly, the pusher plate 3 and the pusher rod fixing sleeve 4 form a nearly flush end face, which helps to enhance structural stability, improve processing accuracy, and facilitate maintenance and replacement, making the whole structure more robust and reliable.

[0029] In this embodiment, the sealing ring 5 is made of rubber, which has good elasticity and sealing performance. The rubber material can adapt to different working environments and temperature changes, ensuring the long-term stability and durability of the sealing ring.

[0030] In this embodiment, the anti-rotation structure consists of a keyway formed in the shaft hole of the drive shaft 1, a keyway formed on the outer periphery of the push rod 2, and a key correspondingly fitted into the aforementioned two keyways. The key prevents relative rotation between the drive shaft 1 and the push rod 2, ensuring that the push rod 2 rotates synchronously with the drive shaft 1. The key can be a flat key or a spline. Of course, other anti-rotation structures can also be used, such as setting the push rod 2 as a hexagonal rod with a hexagonal cross-section, and correspondingly setting the shaft hole of the drive shaft 1 as a hexagonal hole, which can achieve the same anti-rotation effect.

[0031] The sealing principle of this water seal structure mainly relies on the compression deformation of the sealing ring 5. When the push rod fixing sleeve 4 is screwed onto the drive shaft 1 via threads, the push plate 3 is pressed by the partition part 401, causing the push rod 2 to move towards the bottom surface of the shaft hole of the drive shaft 1. This movement process causes the distance S1 between the end face of the push rod 2 and the bottom surface of the shaft hole of the drive shaft 1 to gradually decrease until it is less than the thickness S2 of the sealing ring 5. At this time, the sealing ring 5 is subjected to axial compressive force, resulting in radial expansion deformation, thereby tightly filling the gap between the end face of the push rod 2 and the bottom surface of the shaft hole of the drive shaft 1. Since the sealing ring 5 is made of rubber, it has good elasticity and sealing performance, thus effectively preventing water from leaking out of the gap, thereby achieving a sealing effect.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A push rod tail end water seal structure, comprising a drive shaft (1), a push rod (2), a push pressure plate (3), and a push rod fixing sleeve (4); the tail end of the push rod (2) is inserted into the shaft hole of the drive shaft (1), and an anti-rotation structure is provided between the push rod (2) and the drive shaft (1) to prevent circumferential rotation between the push rod (2) and the drive shaft (1); an annular groove is provided on the outer periphery of the push rod (2), and the push pressure plate (3) is correspondingly embedded in the annular groove; characterized in that: A sealing ring (5) is sandwiched between the end face of the push rod (2) and the bottom face of the shaft hole of the drive shaft (1). The push rod fixing sleeve (4) is sleeved on the outside of the push plate (3) and the drive shaft (1), and the push rod fixing sleeve (4) has a partition (401) for pressing the push plate (3). The push rod fixing sleeve (4) and the drive shaft (1) are screwed together so that the push plate (3) drives the push rod (2) to press against the sealing ring (5).

2. The push rod tail end water seal structure according to claim 1, characterized in that: The minor diameter of the thread on the push rod fixing sleeve (4) is greater than the outer diameter of the push plate (3).

3. The push rod tail end water seal structure according to claim 1, characterized in that: The pusher plate (3) has a slot that matches the partition (401) on the pusher rod fixing sleeve (4).

4. The push rod tail end water seal structure according to claim 1, characterized in that: The sealing ring (5) is made of rubber.

5. The push rod tail end water seal structure according to any one of claims 1 to 4, characterized in that: The drive shaft (1) has a water inlet (101) and the water inlet (101) is connected to the shaft hole.

6. The push rod tail end water seal structure according to claim 5, characterized in that: The push rod (2) is provided with a water passage inner hole (201). The water flowing into the water inlet (101) flows into the water passage inner hole (201) through the through hole (102) at the bottom of the shaft hole.

7. The push rod tail end water seal structure according to any one of claims 1 to 4, characterized in that: The anti-rotation structure is a key that is fitted between the shaft hole of the drive shaft (1) and the outer periphery of the push rod (2). The key is a flat key or a spline.

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