A grease injection head bell mouth oil scraping device

Abstract

Provided is a grease injection head bell mouth oil scraping device, comprising a support, a lower pressing block is installed in the center of the support; the center of the lower pressing block straightens the cable and scrapes off the grease; the upper end of the support is provided with a support inner cavity; the bottom end of one side of the support inner cavity is provided with an oil drain hole; the lower pressing plate is installed at the opening of the upper end of the support; the center of the lower pressing plate is provided with a through hole II; the upper end of the lower pressing plate is provided with a middle pressing plate; the center of the middle pressing plate is provided with a C-shaped structure oil scraping packing; the top of the middle pressing plate is provided with an upper pressing plate; the upper, middle and lower pressing plates are fastened to the support as a whole by vertical bolts; the middle pressing plate is provided with a notch to install the middle insert; a compression spring is installed between two groups of middle inserts through horizontal bolts, and the middle insert and the middle pressing plate are elastically connected as a whole through horizontal bolts, and the oil scraping packing is squeezed and pushed by the middle insert to scrape off the grease on the cable. The invention has a simple and compact structure, is safe and reliable, is easy to assemble, is convenient to disassemble and replace, is economical, energy-saving and environmentally friendly, has higher humanization, and is more efficient in scraping.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield wellhead equipment, and in particular relates to a bell-mouth oil scraping device for a grease injection head. Background Art

[0002] The traditional bell mouth has a guiding function, but as the requirements for work efficiency become higher and higher, the single guiding function of the bell mouth can no longer meet the requirements of efficiency and environmental protection.

[0003] The common problems of the oil scraper plate and the oil scraper device disclosed in the announcement number CN208564508U for oil well minor repair operations are: the structure is scattered, the number of parts is too large, which is not conducive to miniaturization design, and the assembly is complicated; in particular, it is not easy to quickly disassemble and replace the vulnerable parts after they are damaged. With the demand for timeliness, safety, advancement, and environmental protection in oil drilling operations, technical personnel in this field urgently need to develop a bell-mouth oil scraper device with simple and compact structure, safety and reliability, convenient assembly, convenient disassembly and replacement, environmental protection and energy saving, and higher humanization. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a bell-mouth oil scraper device for a grease injection head, which adopts upper, middle and lower pressure plates connected to a support as an integral whole, and arranges a C-shaped oil scraper packing and a middle insert on the middle pressure plate to achieve structural improvement of the single-sided elastic oil scraper design, and provides a bell-mouth oil scraper device which is easy to disassemble, simple and compact in structure, safe and reliable, easy to assemble, convenient to disassemble and replace, environmentally friendly and energy-saving, more user-friendly, and more efficient in scraping.

[0005] The technical solution adopted by the present invention is as follows: a grease injection head bell-mouth oil scraping device, including a support, characterized in that: an inner hole is formed at the center of the support; the inner hole is adapted to be loaded with a lower pressure block; a through hole I is formed in the center of the lower pressure block; the through hole I is used to straighten the cable and scrape off the grease on the cable; the upper end of the support is provided with an annular support cavity with an inclined surface for collecting grease; the bottom end of one side of the support cavity is provided with an oil drain hole; a step countersunk hole is formed at the opening of the upper end of the support; the step countersunk hole is adapted to install a lower pressing plate; a through hole II for guiding grease is formed in the center of the lower pressing plate; a middle pressing plate is provided at the upper end of the lower pressing plate; a through hole III formed in the center of the middle pressing plate is horizontally adapted to install an oil scraping packing with a C-shaped cross-section, and an oil scraping through hole IV is provided in the center of the oil scraping packing; the oil scraping through hole IV is used for secondary elastic scraping of grease; an upper pressing plate is provided at the top of the middle pressing plate; a threading through hole V is formed in the center of the upper pressing plate; the upper pressing plate is surrounded by Vertical bolt through holes are evenly distributed in the radial direction; the vertical bolts pass through the through holes of the upper and middle pressure plates from top to bottom in turn and then screw into the vertical threaded holes of the support to fasten the upper, middle and lower pressure plates and the support as a whole; the middle pressure plate is provided with a notch at the same level as the scraper packing; the middle insert is embedded in the notch; the middle insert consists of two parts, the inner middle insert vertically presses the inner wall of the C-shaped structure against the vertical outer wall of the scraper packing; the outer middle insert The outer wall of the block is close to the inner wall of the notch of the middle pressure plate; a compression spring is pressed and installed between the two groups of middle embedded blocks; two groups of axially symmetrical horizontal bolts successively pass through the inner wall of the notch of the middle pressure plate, the compression spring and the two groups of middle embedded blocks, and then screw into the horizontal threaded holes formed on the inner side of the middle pressure plate to elastically press the middle embedded blocks against the vertical outer wall of the scraper packing, and elastically connect the middle embedded blocks and the middle pressure plate as a whole; the grease on the cable is elastically scraped off through the scraper packing of the C-shaped structure.

[0006] In the above technical solution, further: a threaded connection sleeve is formed at the center of the bottom end of the support; the threaded connection sleeve is used to connect the upper cylinder of the grease injection head.

[0007] In the above technical solution, further: the oil drain hole at the bottom of the inner cavity of the support is installed and connected to one end of the oil return pipe assembly and discharges grease outward through the oil return pipe assembly.

[0008] In the above technical solution, further: the upper pressure plate is composed of two upper half pressure plates of semicircular structure spliced ​​together to form a complete circle and adapted to the shape of the support.

[0009] In the above technical solution, further: the middle pressure plate is provided with weight-reducing holes; there are three weight-reducing holes and they are evenly distributed radially along one side of the middle pressure plate.

[0010] In the above technical solution, further: the diameter of the through hole II is larger than the cable diameter and smaller than the outer diameter of the scraper packing; the through hole II is used to pass the cable, and the through hole II is used to separate the scraper packing from the lower pressure block; the through hole II is used to prevent the annular groove and the cross groove edges formed on the shaft end of the lower pressure block from damaging the scraper packing.

[0011] In the above technical solution, further: the upper and lower ends of the lower pressing block are respectively formed with an annular groove and a cross groove; the annular groove and the cross groove are used to increase the grease discharge channel and help save assembly time.

[0012] In the above technical solution, further: the compression springs and horizontal bolts are respectively provided with two groups, and the two groups of compression springs and horizontal bolts are symmetrically distributed on the left and right axes with the central axis of the middle insert as the symmetry axis.

[0013] The advantages of the present invention compared with the prior art are:

[0014] 1. The present invention realizes primary grease scraping by the lower pressing block 6 and elastic scraping packing 7 to realize secondary grease elastic scraping; the scraping effect is excellent, energy-saving, environmentally friendly and efficient.

[0015] 2. The C-shaped structure of the oil scraper packing 7 of the present invention pre-tightens and squeezes the middle block 4 of the core through the compression spring 11, and pushes the middle block 4 toward the center of the oil scraper device through the compression spring 11; then the oil scraper packing 7 is squeezed forward by the inner middle block 4, and when the cable 12 is lifted upward, the grease on the outside of the cable 12 is scraped off to achieve secondary oil scraping.

[0016] 3. The oil scraper mechanism of the present invention has a simple structure, is easy to assemble, and the wearing parts are easy to replace; the wearing part, the oil scraper packing 7, can be disassembled and replaced by disassembling the horizontal bolt 10; when assembling, only the middle insert 4 needs to be placed in the notch 3-4, and then the horizontal bolt 10 is screwed in horizontally to complete the assembly of the elastic oil scraper mechanism; it is easy to use.

[0017] 4. The setting of the through hole II5-1 of the present invention, which is larger than the diameter of the cable 12 and smaller than the outer diameter of the scraper packing 7, can not only make the cable 12 pass easily, but also separate the scraper packing 7 from the lower pressing block 6, ensuring that the edges of the lower pressing block 6 do not damage the scraper packing 7; the service life is more durable.

[0018] 5. The arrangement of the weight-reducing holes 3-1 of the present invention cooperates with the split middle insert 4 to achieve a lightweight counterweight design, and the overall structure of the device is more stable.

[0019] 6. The semicircular structure design of the upper pressing plate 2 of the present invention facilitates the disassembly and replacement of the oil scraper packing 7, and the replacement can be completed by disassembling the vertical bolts 9, with a simple structure and convenient disassembly and assembly.

[0020] 7. An inner hole 1-3 is provided at the center position of the support 1 of the present invention and a pressing block 6 is installed. The pressing block 6 is used to straighten the cable 12 on the one hand; on the other hand, an annular groove and a cross groove 6-1 are provided at the upper and lower ends of the pressing block 6, which is better conducive to assembly and saves time, increases the discharge channels of grease, and is more conducive to the discharge of grease.

[0021] 8. The support 1 of the present invention is provided with a support inner cavity 1-1 with an annular inclined surface, and an oil drain hole 1-2 is provided on one side of the support inner cavity 1-1. The oil drain hole 1-2 is connected to the external oil return pipe assembly 8. This design makes it easier for grease to be drained to the oil drain hole 1-2, so that the grease can be connected to the external oil return pipe assembly 8 through the oil drain hole 1-2 and the grease is discharged.

[0022] 9. The support 1 of the present invention is provided with a support step countersunk hole 1-4 at the upper port, and the support step countersunk hole 1-4 is used to install the lower pressure plate 5, which has the effect of saving space.

[0023] 10. The present invention has a simple and compact structure, is safe and reliable, is easy to assemble, convenient to disassemble and replace, is economical, energy-saving and environmentally friendly, is more user-friendly, and has more efficient scraping. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the longitudinal structure of the present invention;

[0025] Figure 2 for Figure 1 AA section view;

[0026] Figure 3 for Figure 1 A top view of

[0027] Figure 4 is a schematic diagram of the cross-sectional structure of the middle insert;

[0028] Figure 5 for Figure 4 Complete bottom view. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-5 Specific embodiments of the present invention are described.

[0030] The following examples are provided to facilitate a better understanding of the present invention, but are not intended to limit the present invention. The following examples are only a portion of the present invention, rather than all of the examples. The components used in the following examples are commercially available unless otherwise specified.

[0031] In the present invention, unless otherwise clearly specified and limited, in the absence of any contrary description, the directional words contained in the terms such as "up, down, left, right, inside, outside, top, bottom, vertical, horizontal" only represent the orientation of the terms in normal use, or are for the convenience of describing the present invention and simplifying the description, or are common names understood by those skilled in the art, and shall not be regarded as limitations on the technical solution unless otherwise clearly specified and limited.

[0032] In addition, in the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, or a mechanical connection; it can be directly connected or indirectly connected through other intermediate components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention should be understood according to specific circumstances.

[0033] A grease injection head bell mouth oil scraping device comprises a support 1. The support 1 has a T-shaped structure in longitudinal section, which facilitates the assembly of other components.

[0034] In the above embodiment, further: a threaded connection sleeve 1-6 is formed at the center of the bottom end of the support 1; the threaded connection sleeve 1-6 is used to connect the upper cylinder of the grease injection head, so that the present invention and the grease injection head cylinder are adapted and connected as one, which is also conducive to the compact and miniaturized design of the device of the present invention.

[0035] The improvement of the present invention is that: the support 1 is provided with an inner hole 1-3 at the center thereof; the inner hole 1-3 is adapted to be fitted with a cylindrical lower pressing block 6 through a boss provided at the bottom of the inner hole 1-3. The lower pressing block 6 is used to straighten the cable 12 or the steel wire.

[0036] In the above embodiment, further: the lower pressing block 6 is provided with an annular groove and a cross groove 6-1 (such as Figure 1 The annular groove and the cross groove 6-1 at the bottom are clamped on the boss at the bottom of the inner hole 1-3. The annular groove and the cross groove 6-1 are used to increase the grease discharge channel and help save the assembly time of the lower pressing block 6 and other components.

[0037] The center of the lower pressing block 6 is provided with a through hole I6-2, which is used to straighten the cable 12 or the steel wire and scrape off the grease on the cable 12 or the steel wire. That is, the cable 12 or the steel wire completes the first oil scraping operation on the lower pressing block 6.

[0038] Designed for miniaturization and compactness: the upper end of the support 1 is provided with an annular support cavity 1-1 with an inclined surface for collecting grease; the top of the support cavity 1-1 is connected to the annular groove and the cross groove 6-1 formed on the axial upper end of the lower pressure block 6, so as to guide the grease into the support cavity 1-1 formed on the support 1 through the annular groove and the cross groove 6-1, and then, an oil drain hole 1-2 is provided at the bottom end of one side of the support cavity 1-1.

[0039] In the above embodiment, further: the oil drain hole 1-2 at the bottom of the support inner cavity 1-1 is installed and connected to one end of the oil return pipe assembly 8 to drain grease outward.

[0040] The upper opening of the support 1 is formed with a step countersunk hole 1-4; the step countersunk hole 1-4 is adapted to install the lower pressing plate 5; the upper horizontal surface of the lower pressing plate 5 is flush with the upper horizontal surface of the step countersunk hole 1-4 of the support 1 to save installation space.

[0041] In addition, a through hole II5-1 for guiding grease is formed in the center of the lower pressing plate 5.

[0042] In the above embodiment, further: the diameter of the through hole II5-1 is larger than the diameter of the cable 12 and smaller than the outer diameter of the scraper packing 7. The through hole II5-1 is used to pass the cable 12 or the steel wire, and the through hole II5-1 is used to separate the scraper packing 7 from the lower pressing block 6; the through hole II5-1 is used to ensure and prevent the edges of the annular groove and the cross groove 6-1 formed on the shaft end of the lower pressing block 6 from damaging the scraper packing 7, thereby protecting the scraper packing 7 and extending its service life.

[0043] The upper end of the lower pressing plate 5 is provided with a middle pressing plate 3. The middle pressing plate 3 is a main improved component.

[0044] In the above embodiment, further: the middle pressure plate 3 is provided with a weight-reducing hole 3-1; the weight-reducing hole 3-1 has three holes and is evenly distributed radially along one side of the middle pressure plate 3 (such as Figure 2 The weight-reducing hole 3-1 is used to balance the force of the elastic oil scraper device installed on the middle pressure plate 3, balance the force relationship, and stabilize the device as a whole.

[0045] The middle plate 3 has a through hole III3-5 in the center; the through hole III3-5 is used to horizontally fit the scraper packing 7 with a C-shaped cross section. The C-shaped scraper packing 7 is used to scrape grease with the elastic scraper device described later.

[0046] An oil scraping through hole IV7-1 is arranged at the C-shaped center of the oil scraping packing 7; the oil scraping through hole IV7-1 is used for secondary elastic scraping of grease in cooperation with the elastic oil scraping device described later.

[0047] An upper pressing plate 2 is disposed on the top of the middle pressing plate 3 .

[0048] In order to facilitate the disassembly and replacement of the oil scraper packing 7. In the above embodiment, further: the upper pressure plate 2 is composed of two upper half pressure plates of semicircular structures spliced ​​together to form a complete circle and adapted to the shape of the support 1 (such as Figure 3 shown).

[0049] A threading hole V2-1 is formed at the center of the upper pressing plate 2; the diameter of the threading hole V2-1 is larger than the cable 12 or the steel wire to facilitate threading.

[0050] The upper pressing plate 2 is radially evenly provided with vertical bolt through holes 2-2; the vertical bolts 9 pass through the through holes 3-2 (such as Figure 2 , Figure 1 After the support 1 is screwed into the vertical threaded holes 1-5, the upper, middle and lower pressing plates (2, 3, 5) are fastened to the support 1 as a whole. (See Figure 1 )

[0051] The middle pressure plate 3 is provided with a notch 3-4 at the same level as the oil scraper packing 7 (see Figure 1 AA sectional view); the middle insert 4 is embedded and installed in the notch 3-4.

[0052] Specifically: the middle insert 4 consists of two parts (such as Figure 4 As shown), the inner middle insert 4 vertical inner wall presses the C-shaped structure of the scraper packing 7 vertical outer wall (as shown Figure 2 The outer wall of the middle insert 4 is close to the inner wall of the notch of the middle pressure plate 3; the compression spring 11 (as shown) is pressed into the installation between the two sets of middle inserts 4 Figure 2 Specifically, front and rear spring mounting holes are formed between the middle inserts 4 of the two parts, and two compression springs 11 are respectively pressed into two spring mounting holes 11-1 symmetrically installed on the left and right axes, and the left and right displacement of the springs is limited by the spring mounting holes 11-1. The inner middle insert of the middle insert 4 is formed with an arc groove 4-1; the arc groove 4-1 is adapted to the vertical outer wall of the scraper packing 7 to push and squeeze the scraper packing 7. The outer end of the outer middle insert 4 is formed with a fastening mounting hole 4-2 (as shown in FIG. Figure 5 , Figure 2 ), the fastening mounting hole 4-2 is used for fastening and limiting the vertical outer wall of the outer middle insert 4.

[0053] Two groups of axially symmetrical horizontal bolts 10 successively and horizontally penetrate the inner side wall of the notch of the middle pressure plate 3 , the compression spring 11 and the two groups of middle insert blocks 4 and then screw into the horizontal threaded hole 3 - 3 formed on the inner side of the middle pressure plate 3 .

[0054] Thus, the middle insert 4 is elastically pressed against the vertical outer wall of the scraper packing 7 to elastically connect the middle insert 4 and the middle pressing plate 3 as one. That is, the grease on the cable 12 is elastically scraped off by the scraper packing 7 of the C-shaped structure for a second time.

[0055] In the above embodiment, further: the compression springs 11 and horizontal bolts 10 are respectively provided with two groups, and the two groups of compression springs 11 and horizontal bolts 10 are symmetrically distributed on the left and right axes with the central axis of the middle insert 4 as the axis of symmetry.

[0056] The working principle of the present invention is as follows: when multiple operations are performed, the cable 12 or steel wire is in frictional contact with the inner hole of the oil scraper packing 7 and the inner hole of the lower pressing block 6; the lower pressing block 6 realizes a first oil scraping operation; since the compression spring 11 has a pre-tightening force when assembled, the compression spring 11 has a force on the middle insert 4, and the compression spring 11 pushes the core of the middle insert 4 to move toward the center position of the oil scraper device. Since the middle insert 4 pushes the oil scraper packing 7 forward to press the cable 12 or steel wire, the grease is scraped off when the cable 12 or steel wire is lifted upward, realizing secondary oil scraping. The scraped grease is guided into the support cavity 1-1 along the annular groove and the cross groove 6-1 formed on the lower pressing block 6, and then discharged out of the device through the oil return pipe assembly 8 along the oil discharge hole 1-2 on one side of the support cavity 1-1.

[0057] From the above description, it can be found that: the present invention realizes primary grease scraping by the lower pressing block 6; realizes secondary grease elastic scraping by the elastic scraping packing 7; the scraping effect is excellent, energy-saving, environmentally friendly and efficient.

[0058] The oil scraper packing 7 of the C-shaped structure of the present invention pre-tightens and squeezes the middle block 4 of the core through the compression spring 11, and pushes the middle block 4 toward the center of the oil scraper device through the compression spring 11; then the oil scraper packing 7 is squeezed forward by the middle block 4, and when the cable 12 is lifted upward, the grease on the outside of the cable 12 is scraped off to achieve secondary oil scraping.

[0059] The oil scraper mechanism of the present invention has a simple structure, is easy to assemble, and the wearing parts are easy to replace; the wearing part, the oil scraper packing 7, can be disassembled and replaced by removing the horizontal bolt 10; when assembling, it is only necessary to put the middle insert 4 into the notch 3-4, and then screw in the horizontal bolt 10 horizontally to complete the assembly of the elastic oil scraper mechanism; it is easy to use.

[0060] The setting of the through hole II5-1 of the present invention, which is larger than the diameter of the cable 12 and smaller than the outer diameter of the scraper packing 7, not only allows the cable 12 to pass easily, but also separates the scraper packing 7 from the lower pressing block 6, ensuring that the edges on the lower pressing block 6 do not damage the scraper packing 7; the service life is more durable.

[0061] The arrangement of the weight-reducing holes 3 - 1 of the present invention cooperates with the split middle insert 4 to achieve a lightweight counterweight design, and the overall structure of the device is more stable.

[0062] The semicircular structure design of the upper pressing plate 2 of the present invention facilitates the disassembly and replacement of the oil scraper packing 7, and the replacement can be completed by disassembling the vertical bolts 9, with a simple structure and convenient disassembly and assembly.

[0063] An inner hole 1-3 is provided at the center position of the support 1 of the present invention and a lower pressing block 6 is installed. On the one hand, the lower pressing block 6 is used to straighten the cable 12; on the other hand, an annular groove and a cross groove 6-1 are provided at the upper and lower ends of the lower pressing block 6, which is better conducive to assembly and saves time, increases the grease discharge channels, and is more conducive to grease discharge.

[0064] The support 1 of the present invention is provided with a support inner cavity 1-1 with an annular inclined surface, and an oil drain hole 1-2 is provided on one side of the support inner cavity 1-1. The oil drain hole 1-2 is connected to the external oil return pipe assembly 8. Such a design makes it easier for grease to be drained to the oil drain hole 1-2, so that the grease can be connected to the external oil return pipe assembly 8 through the oil drain hole 1-2 and the grease is discharged.

[0065] The support 1 of the present invention is provided with a support step countersunk hole 1-4 at the upper port thereof, and the support step countersunk hole 1-4 is used for installing the lower pressing plate 5, which has the effect of saving space.

[0066] In summary, the present invention adds an oil scraper packing 7 on the basis of the original bell mouth design, which not only ensures the guiding function of the bell mouth, but also can scrape the oil again, ensuring that the cable 12 or the steel wire is clean and grease-free. This device can be used to scrape off the grease on the cable 12 or the steel wire rope, thus realizing green and environmentally friendly operation. The present invention has a simple and compact structure, is safe and reliable, is easy to assemble, is convenient to disassemble and replace, is economical, energy-saving and environmentally friendly, is more user-friendly, and has a more efficient scraping effect. It solves the problems of the existing oil scraper device that the grease is not easy to scrape clean, the efficiency is low, and the environmental protection is poor; in particular, it overcomes the technical difficulties that the oil scraper device in the prior art has a complex structure, is not conducive to miniaturization and compact design, and is not conducive to the rapid disassembly and replacement of wearing parts for rapid assembly.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0068] In addition, it should be understood that although the present specification is described according to an implementation method, the implementation method does not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in this embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0069] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A grease injection head bell-mouth oil scraping device, comprising a support (1), characterized in that: The support (1) is provided with an inner hole (1-3) at the center; the inner hole (1-3) is adapted to be installed in a lower pressing block (6); the lower pressing block (6) is provided with a through hole I (6-2) at the center; the through hole I (6-2) is used to straighten the cable (12) and scrape off grease on the cable (12); the upper end of the support (1) is provided with a support inner cavity (1-1) with an annular inclined surface and used to collect grease; the bottom end of one side of the support inner cavity (1-1) is provided with an oil drain hole (1-2); the upper end opening of the support (1) is provided with a step countersunk hole (1-4); the step countersunk hole (1-4) is adapted to be installed in a lower pressing plate (5); the A through hole II (5-1) for guiding grease is formed in the center of the lower pressing plate (5); a middle pressing plate (3) is provided at the upper end of the lower pressing plate (5); a through hole III (3-5) formed in the center of the middle pressing plate (3) is horizontally adapted to install an oil scraper packing (7) with a C-shaped cross-section, and an oil scraper through hole IV (7-1) is provided in the center of the oil scraper packing (7); the oil scraper through hole IV (7-1) is used for secondary elastic scraping of grease; an upper pressing plate (2) is provided at the top of the middle pressing plate (3); a threading through hole V (2-1) is formed in the center of the upper pressing plate (2); vertical screws are evenly distributed radially around the upper pressing plate (2). The bolt passes through the hole (2-2); the vertical bolt (9) passes through the upper and middle pressure plates (2, 3) from top to bottom in sequence and then screws into the vertical threaded holes (1-5) formed on the support (1) to fasten the upper, middle and lower pressure plates (2, 3, 5) and the support (1) together; the middle pressure plate (3) is provided with a notch (3-4) at the same level as the oil scraper packing (7); the middle insert (4) is embedded in the notch (3-4); the middle insert (4) is composed of two parts, the inner middle insert (4) vertically presses the inner wall of the C-shaped oil scraper packing (7) vertically against the outer wall; the outer middle insert (4) is provided with a notch (3-4) at the same level as the oil scraper packing (7); The side wall is close to the inner wall of the notch of the middle pressure plate (3); a compression spring (11) is pressed and installed between the two groups of middle inserts (4); two groups of axially symmetrical horizontal bolts (10) successively pass horizontally through the inner wall of the notch of the middle pressure plate (3), the compression spring (11) and the two groups of middle inserts (4) and then screw into the horizontal threaded hole (3-3) formed on the inner side of the middle pressure plate (3) to elastically press the middle insert (4) against the vertical outer wall of the scraper packing (7) and elastically connect the middle insert (4) and the middle pressure plate (3) as a whole; the grease on the cable (12) is elastically scraped off by the C-shaped structure of the scraper packing (7).

2. The grease injection head bell mouth oil scraping device according to claim 1, characterized in that: A threaded connection sleeve (1-6) is formed at the center of the bottom end of the support (1); the threaded connection sleeve (1-6) is used to connect the upper cylinder of the grease injection head.

3. The grease injection head bell mouth oil scraping device according to claim 1, characterized in that: The oil drain hole (1-2) at the bottom of the support inner cavity (1-1) is installed and connected to one end of the oil return pipe assembly (8) to drain grease outwards.

4. The grease injection head bell mouth oil scraping device according to claim 1, characterized in that: The upper pressing plate (2) is composed of two upper half pressing plates of a semicircular structure spliced ​​together to form a complete circle and is adapted to the outer shape of the support (1).

5. The grease injection head bell mouth oil scraping device according to claim 1, characterized in that: The middle pressure plate (3) is provided with weight-reducing holes (3-1); the weight-reducing holes (3-1) are in three numbers and are evenly distributed radially along one side of the middle pressure plate (3).

6. The oil scraping device for the bell mouth of a grease injection head according to claim 1, characterized in that: The diameter of the through hole II (5-1) is larger than the diameter of the cable (12) and smaller than the outer diameter of the oil scraper packing (7); the through hole II (5-1) is used to pass the cable (12), and the through hole II (5-1) is used to separate the oil scraper packing (7) from the lower pressing block (6); the through hole II (5-1) is used to prevent the edges of the annular groove and the cross groove (6-1) formed on the shaft end of the lower pressing block (6) from damaging the oil scraper packing (7).

7. The grease injection head bell mouth oil scraping device according to claim 1, characterized in that: The lower pressing block (6) is provided with an annular groove and a cross groove (6-1) at the upper and lower axial ends respectively; the annular groove and the cross groove (6-1) are used to increase the grease discharge channel and help save assembly time.

8. The oil scraping device for the bell mouth of a grease injection head according to claim 1, characterized in that: The compression springs (11) and the horizontal bolts (10) are provided in two groups respectively. The two groups of compression springs (11) and the horizontal bolts (10) are symmetrically arranged on the left and right axes with the central axis of the middle insert (4) as the axis of symmetry.

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