Telescopic arm for rock drilling equipment

Abstract

The utility model provides a telescopic arm for rock drilling equipment. The telescopic arm comprises an inner arm, an outer arm and a sealing mechanism, wherein the inner arm is sleeved with the outer arm in a sliding mode; the sealing mechanism is arranged at the opening end of the outer arm and comprises a sealing gland connected to the outer arm in a sleeving mode and a sealing assembly acting between the sealing gland and the inner arm in the radial direction. And an adjusting pad is arranged between the sealing gland and the outer arm and is used for axially sealing the opening of the outer arm. In the application, the adjusting pad acts between the open end of the outer arm and the sealing gland and is used for axially sealing the open end of the outer arm; the sealing assembly acts between the sealing gland and the inner arm and seals a gap between the sealing gland and the inner arm in the radial direction; under the cooperation of the sealing assembly, the adjusting pad and the sealing gland, the gap between the open end of the outer arm and the inner arm is sealed in the axial direction and the radial direction, the sealing performance is good, and the probability that external impurities enter the telescopic arm to affect the performance of the telescopic arm is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of telescopic boom technology, specifically to a telescopic boom for rock drilling equipment. Background Technology

[0002] In rock drilling equipment, the working arm is mostly a telescopic structure, including an inner arm and an outer arm that extend and retract, so that the working arm can change its length by extending and retracting. A slider is provided between the inner arm and the outer arm to prevent swaying. In the prior art, a cover plate is provided at the end face where the outer arm and the inner arm connect to prevent external impurities from entering the telescopic arm. A sealing gasket is provided between the cover plate and the outer arm for sealing.

[0003] However, this sealing structure has poor sealing performance. In order to ensure the smooth movement of the inner arm relative to the cover plate, there is still an axial gap between the cover plate, the inner ring wall of the sealing gasket and the outer ring wall of the inner arm. When the inner arm and the outer arm slide relative to each other, external impurities will still enter between the inner arm and the outer arm through this gap, causing interference to the slider.

[0004] Therefore, the sealing structure of the telescopic arm in the prior art has room for further improvement. Utility Model Content

[0005] In view of this, and in response to the technical problem of poor sealing performance of telescopic booms in the prior art, this application provides a telescopic boom for underground mining equipment, which has a sealing mechanism at the front end of the outer boom. This sealing mechanism has good sealing performance and can reduce the probability of external impurities entering the telescopic boom.

[0006] This application provides a telescopic boom for rock drilling equipment, comprising:

[0007] Inner arm;

[0008] The outer arm is configured to be slidably sleeved on the inner arm;

[0009] A sealing mechanism, located at the opening end of the outer arm, includes a sealing cap sleeved on the outer arm and a sealing assembly acting radially between the sealing cap and the inner arm.

[0010] An adjusting pad is provided between the sealing cap and the outer arm, and the adjusting pad is used to axially seal the opening of the outer arm.

[0011] Compared with the prior art, the telescopic boom for rock drilling equipment provided in this application is provided with a sealing gland, a sealing component and an adjusting pad at the opening end of the outer arm. The sealing gland is sleeved on the outer arm and the adjusting pad acts between the opening end of the outer arm and the sealing gland to axially seal the opening end of the outer arm, which can reduce the probability of axial entry into the gap between the outer arm and the inner arm.

[0012] The sealing component acts between the sealing gland and the inner arm, sealing the gap between them in the radial direction to prevent external impurities from entering the telescopic arm through the gap between the inner ring of the sealing gland and the outer ring of the inner arm. With the cooperation of the sealing component, the adjusting pad, and the sealing gland, the gap between the outer arm opening and the inner arm is sealed in both the axial and radial directions, resulting in good sealing performance. This greatly reduces the probability of external impurities entering the telescopic arm and affecting its performance, and overcomes the problem of external impurities entering through the axial gap between the cover plate and the inner arm in existing technologies.

[0013] Preferably, the sealing gland is provided with a sealing groove for installing a sealing assembly, and the sealing groove is recessed radially away from the inner arm;

[0014] The inner diameter of the sealing assembly is smaller than the outer diameter of the inner arm.

[0015] In this embodiment, by setting a sealing groove, the sealing component can be installed more stably, making it less likely for the sealing component to come off; and since the inner diameter of the sealing component is smaller than the outer diameter of the inner arm, the sealing component can fit tightly against the outer side of the inner arm to ensure the sealing effect.

[0016] Preferably, the sealing assembly includes a first sealing ring and a second sealing ring, which are spaced apart along the axial direction.

[0017] The sealing groove is divided into a first groove and a second groove. The first groove is used to install the first sealing ring, and the second groove is used to install the second sealing ring.

[0018] In this embodiment, by setting two sealing rings, the sealing performance can be enhanced; and the two sealing rings are set at intervals so that they do not interfere with each other, which can achieve multiple protective effects of sealing.

[0019] Preferably, the first groove opens on the end face of the sealing cap near the inner arm;

[0020] The first sealing ring includes a first mounting portion and a first protrusion. The first mounting portion is disposed in the first groove, and the first protrusion is connected to the radially inner side of the first mounting portion.

[0021] The axial width of the first protrusion decreases in the direction away from the first mounting portion.

[0022] In this embodiment, the axial thickness of the first protrusion is lower as it gets closer to the inner arm, which reduces the resistance when the inner arm moves relative to the first sealing ring. This ensures both sealing performance and smooth extension and retraction of the telescopic arm.

[0023] Preferably, the end of the first protrusion away from the first mounting portion extends beyond the radial opening end face of the first groove;

[0024] The inner end of the first protrusion has a tapered structure;

[0025] The inner diameter of the first protrusion is smaller than the outer diameter of the inner arm.

[0026] In this embodiment, the first protrusion is a tapered structure, which ensures a relatively stable and reliable connection between the first protrusion and the first mounting part, while also ensuring good sealing and reducing resistance to the inner arm.

[0027] Preferably, the second groove opens on the end face of the sealing cap near the inner arm and on the end face of the sealing cap away from the outer arm;

[0028] The second sealing ring includes a second mounting portion and a second protrusion. The second mounting portion is disposed in the second groove, and the second protrusion is connected to the axial outer side of the second mounting portion.

[0029] The radial width of the second protrusion decreases in the direction away from the second mounting portion.

[0030] In this embodiment, the second groove opens on the outside of the sealing gland, and the second sealing ring can seal at the opening on the outside of the sealing gland, thereby improving the sealing performance. At the same time, the radial width of the second protrusion decreases in the direction away from the second mounting part, which can reduce the thickness of the second protrusion and increase the elastic deformation force, making it easier for the second protrusion to fit tightly against the outside of the inner arm, thus improving the sealing performance.

[0031] Preferably, the end of the second protrusion away from the second mounting portion extends beyond the axial opening end face of the second groove;

[0032] The end of the second protrusion away from the sealing gland extends beyond the radial opening end face of the second groove;

[0033] Along the radial direction, the inner end of the second protrusion has a tapered structure;

[0034] The inner diameter of the second protrusion is smaller than the inner diameter of the second mounting portion, and the inner diameter of the second protrusion is smaller than the outer diameter of the inner arm.

[0035] In this embodiment, the second protrusion extends out of the second groove, increasing the contact area between the second sealing ring and the inner arm in the axial direction; at the same time, the inner end of the second protrusion has a tapered structure, which reduces the resistance to the inner arm while ensuring contact with the inner arm.

[0036] Preferably, the sealing cap includes a first connecting part and a second connecting part, the first connecting part being sleeved on the outer arm and the second connecting part being sleeved on the inner arm;

[0037] The adjusting pad is located between the second connecting part and the opening end of the outer arm, and the sealing assembly is located between the second connecting part and the inner arm.

[0038] In this embodiment, the first connecting part is sleeved on the outer arm, and with the adjustment pad, the probability of external impurities entering the telescopic arm from the radial direction can be reduced; the second connecting part is sleeved on the inner arm, and with the sealing assembly, the probability of external impurities entering the telescopic arm from the axial direction can be reduced.

[0039] Preferably, the sealing gland is provided with a connecting hole, which extends axially through the second connecting portion;

[0040] The adjusting shim is provided with a mating hole, which penetrates the adjusting shim axially.

[0041] The outer arm opening end is provided with a mounting groove, and the mating hole, connecting hole and mounting groove are coaxially arranged to allow the same connector to be inserted;

[0042] The inner diameter of the adjusting pad is larger than the outer diameter of the inner arm, and the inner diameter of the adjusting pad is smaller than the inner diameter of the outer arm.

[0043] In this embodiment, by providing connectors, connecting holes, and mating holes, the sealing gland and adjusting pad can be connected stably, enabling the sealing mechanism to be stably connected to the outer arm.

[0044] Preferably, a third groove is provided on the radial inner sidewall of the first connecting portion, and the third groove is recessed radially;

[0045] A third sealing ring is provided in the third groove;

[0046] Wherein, the inner diameter of the second connecting part is smaller than the inner diameter of the first connecting part, and the inner diameter of the second connecting part is larger than the outer diameter of the inner arm.

[0047] In this embodiment, by providing a third groove, the adjusting pad can be stably limited, thereby increasing the stability of the sealing mechanism. Attached Figure Description

[0048] Figure 1 This is a partial cross-sectional structural schematic diagram of a telescopic arm for a rock drilling device provided in an embodiment of this application;

[0049] Figure 2 This is a three-dimensional structural schematic diagram of a sealing gland provided in an embodiment of this application;

[0050] Figure 3 This is a partial cross-sectional structural diagram of a sealing gland provided in an embodiment of this application;

[0051] Figure 4 This is a partial cross-sectional structural schematic diagram of the first sealing ring provided in an embodiment of this application;

[0052] Figure 5 This is a partial cross-sectional structural diagram of the second sealing ring provided in an embodiment of this application;

[0053] Figure 6 yes Figure 1 A magnified view of part A.

[0054] Attached reference numerals: 1. Telescopic boom for rock drilling equipment;

[0055] 11. Inner arm; 12. Outer arm; 13. Sealing mechanism; 14. Slider;

[0056] 121. Mounting slot;

[0057] 131. Sealing gland; 132. First sealing ring; 133. Second sealing ring; 134. Adjusting shim; 135. Connecting piece;

[0058] 1311, First connecting part; 1312, Second connecting part; 1313, First groove; 1314, Second groove; 1315, Third groove; 1316, Connecting hole;

[0059] 1321. First mounting part; 1322. First protrusion;

[0060] 1331. Second mounting part; 1332. Second protrusion;

[0061] 1341. Fitting hole. Detailed Implementation

[0062] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0063] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0064] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 above terms should not be construed as limitations on this application.

[0065] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 6 illustrate.

[0066] This application provides a telescopic arm 1 for rock drilling equipment (hereinafter referred to as telescopic arm 1), which can be used in rock drilling equipment. It includes an inner arm 11 and an outer arm 12 that can slide relative to each other to form a telescopic structure, so that the length of the telescopic arm 1 is adjustable. The outer arm 12 is sleeved on the outside of the inner arm 11. The inner diameter of the outer arm 12 is larger than the outer diameter of the outer arm 12. A slider 14 is provided between the inner arm 11 and the outer arm 12 to ensure the stability when the outer arm 12 slides relative to the inner arm 11.

[0067] The telescopic arm 1 also includes a sealing mechanism 13, which is located at the open end of the outer arm 12. The sealing mechanism 13 is used to seal the open end of the outer arm 12 to prevent external impurities from entering between the inner arm 11 and the outer arm 12 from the open end, thus avoiding any impact on the slider 14.

[0068] Specifically, such as Figure 6 As shown, the sealing mechanism 13 includes a sealing cap 131, an adjusting pad 134, and a sealing assembly. The sealing cap 131 is at least partially fitted onto the outer arm 12 and at least partially fitted onto the inner arm 11. The adjusting pad 134 is located between the outer arm 12 and the sealing cap 131 and is used to seal the open end of the outer arm 12 in the axial direction. The sealing assembly is located between the sealing cap 131 and the inner arm 11 and is used to seal the gap between the sealing cap 131 and the inner arm 11 in the radial direction. After the sealing cap 131 is engaged with the sealing assembly and the adjusting pad 134, it can seal the open ends of the inner arm 11 and the outer arm 12 in both the radial and axial directions, greatly reducing the probability of external impurities entering the gap between the inner arm 11 and the outer arm 12.

[0069] The sealing gland 131 is further described below; for example... Figure 2 , Figure 3 As shown, the sealing cap 131 includes a first connecting portion 1311 and a second connecting portion 1312. The first connecting portion 1311 and the second connecting portion 1312 are connected axially, and the second connecting portion 1312 is connected to the side end of the first connecting portion 1311 away from the outer arm 12. The first connecting portion 1311 has a cylindrical structure and is sleeved on the outer arm 12, such as... Figure 5 As shown, the inner surface of the first connecting part 1311 fits against the outer surface of the outer arm 12; the second connecting part 1312 has a cylindrical structure and is sleeved on the inner arm 11, as shown. Figure 5 As shown, the inner side of the second connecting part 1312 is opposite to the outer side of the inner arm 11, and the two are almost in contact.

[0070] In this embodiment, the inner diameter of the first connecting part 1311 is larger than the inner diameter of the second connecting part 1312, and the inner diameter of the second connecting part 1312 is smaller than the inner diameter of the outer arm 12. That is, in the radial direction, the gap between the outer arm 12 and the inner arm 11 at least partially coincides with the second connecting part 1312. In other words, the second connecting part 1312 can block the slider 14 between the inner arm 11 and the outer arm 12 in the axial direction to prevent the slider 14 between the inner arm 11 and the outer arm 12 from coming out.

[0071] It should be noted that the inner diameter of the second connecting part 1312 is larger than the outer diameter of the inner arm 11, thereby ensuring the smooth installation of the sealing cover 131 while reducing the friction area between the inner arm 11 and the sealing cover 131 when the inner arm 11 slides relative to the sealing mechanism 13 and the outer arm 12, thus ensuring the smooth extension and retraction of the telescopic arm 1.

[0072] like Figure 5 As shown, the adjusting pad 134 is located between the second connecting part 1312 and the open end of the outer arm 12. The inner diameter of the adjusting pad 134 is smaller than the inner diameter of the outer arm 12, and the inner diameter of the adjusting pad 134 is larger than the outer diameter of the inner arm 11. The end face of the adjusting pad 134 facing the outer arm 12 is at least partially in contact with the outer arm 12 and at least partially in contact with the slider 14. On the one hand, it limits the slider 14 to prevent the slider 14 from falling out, thereby fixing the slider 14 between the inner arm 11 and the outer arm 12; on the other hand, it creates an axial seal, reducing the probability of external impurities entering the slider 14 axially.

[0073] In this application, the adjustment pad 134 is made of metal.

[0074] Among them, such as Figure 6 As shown, after the first connecting part 1311 is sleeved on the outer arm 12, it can effectively block the probability of external impurities from entering between the adjusting pad 134 and the outer arm 12 from the radial side, thus playing an effective protective role.

[0075] Among them, such as Figure 3 , Figure 6 As shown, a third groove 1315 is provided on the radial inner sidewall of the first connecting part 1311. The third groove 1315 is recessed radially away from the outer arm 12. A third sealing ring is provided in the third groove 1315. The third sealing ring has an annular structure. The third sealing ring acts between the first connecting part 1311 and the outer arm 12 to seal the connection between the sealing cover 131 and the outer arm 12, reducing the probability of external impurities entering the telescopic arm 1 from the connection between the first connecting part 1311 and the outer arm 12.

[0076] Furthermore, such as Figure 6As shown, the end of the second connecting part 1312 facing the inner arm 11 is provided with a sealing groove. The sealing groove is recessed in the direction away from the inner arm 11. The sealing groove is used to install the sealing component, limit the sealing component in the sealing groove, and stably install the sealing component, so that the sealing component is not easy to fall out. While ensuring the connection stability between the sealing component and the sealing cover 131, it can also make the sealing cover 131 have a pressing effect on the sealing component, so that the sealing component can fit tightly on the inner arm 11, ensuring the sealing effect of the radial gap between the second connecting part 1312 and the inner arm 11, so that external impurities are not easy to enter the mounting position of the slider 14 from the radial gap between the second connecting part 1312 and the inner arm 11.

[0077] The inner diameter of the sealing component is smaller than the outer diameter of the inner arm 11, which allows the sealing component to fit tightly against the outer side of the inner arm 11 to ensure a sealing effect. In addition, in the entire sealing mechanism 13, only the inner diameter of the sealing component is smaller than the outer diameter of the inner arm 11, resulting in less resistance to the inner arm 11. This ensures the smooth sliding of the inner arm 11 while also guaranteeing the sealing performance of the axial gap between the sealing mechanism 13 and the inner arm 11.

[0078] Furthermore, the sealing gland 131 is described in further detail; such as Figures 1 to 3 , Figure 6 As shown, the sealing gland 131 is provided with a connecting hole 1316, which penetrates the second connecting part 1312 axially. The connecting hole 1316 is a countersunk hole structure. Figure 1 , Figure 6 As shown, the adjusting pad 134 is provided with a mating hole 1341 corresponding to the connecting hole 1316, and the mating hole 1341 passes through the adjusting pad 134 axially; the end face of the opening end of the outer arm 12 is provided with a mounting groove 121, which is correspondingly provided with the mating hole 1341. The mating hole 1341, the connecting hole 1316 and the mounting groove 121 are all provided with threads. The mating hole 1341, the connecting hole 1316 and the mounting groove 121 are coaxially arranged so that the same connector 135 can be inserted.

[0079] In this embodiment, the connector 135 is a screw, such as Figure 2 As shown, multiple connecting holes 1316 are provided, and the multiple connecting holes 1316 are evenly spaced along the same circumference. The number and position of the mating holes 1341 and the mounting grooves 121 correspond to the connecting holes 1316. The countersunk structure of the connecting holes 1316 ensures that the connector 135 does not protrude outward from the outside of the sealing cover 131, which has a better aesthetic appearance.

[0080] Based on any of the above embodiments, the sealing assembly will be further described; such as Figures 4 to 6As shown, the sealing assembly includes a first sealing ring 132 and a second sealing ring 133, both of which are annular structures and are spaced apart axially. The sealing groove is divided into a first groove 1313 and a second groove 1314, both of which are annular structures. Both grooves are located on the inner wall of the second connecting portion 1312 and are radially oriented away from the inner arm 11. The groove is recessed in the direction; wherein, the first groove 1313 is used to install the first sealing ring 132, and the second groove 1314 is used to install the second sealing ring 133, that is, the first groove 1313 and the second groove 1314 are distributed axially at intervals; in this embodiment, by setting two sealing rings, the sealing performance can be enhanced; and the first sealing ring 132 and the second sealing ring 133 are arranged at intervals and do not interfere with each other, which can play a multiple protective effect of sealing. If one of them is damaged, the other can continue to play a sealing effect, ensuring the sealing durability of the sealing mechanism 13.

[0081] Furthermore, the first sealing ring 132 is described in more detail; such as Figure 4 , Figure 6 As shown, the first groove 1313 is provided on one side near the outer arm 12. The first groove 1313 opens on the inner end face of the second connecting part 1312 near the inner arm 11, and the opening faces the inner arm 11.

[0082] The first sealing ring 132 includes a first mounting portion 1321 and a first protrusion 1322. The first protrusion 1322 is connected to the radially inner side of the first mounting portion 1321, that is, the first protrusion 1322 is radially connected to the inner side of the first mounting portion 1321. Both the first protrusion 1322 and the first mounting portion 1321 are annular structures. The first mounting portion 1321 is disposed in the first groove 1313. The cross-section of the first mounting portion 1321 is generally rectangular. There is a gap between the end corner of the first mounting portion 1321 away from the first protrusion 1322 and the bottom corner of the first groove 1313, so as to facilitate the insertion of the first mounting portion 1321 into the first groove 1313.

[0083] The overall thickness of the first sealing ring 132 is greater than the depth of the first groove 1313, and the inner diameter of the first protrusion 1322 is smaller than the outer diameter of the inner arm 11. The axial width of the first protrusion 1322 decreases in the direction away from the first mounting part 1321, which makes the resistance smaller when the inner arm 11 moves relative to the first sealing ring 132. While ensuring the sealing performance, it can also ensure the smooth extension and retraction of the telescopic arm 1.

[0084] Furthermore, such as Figure 4As shown, the first protrusion 1322 is generally tapered, and the end of the first protrusion 1322 away from the first mounting part 1321 is a pointed structure, and this end extends beyond the radial opening end face of the first groove 1313, thereby tightly fitting with the inner arm 11. In this embodiment, the axial thickness of the first protrusion 1322 is lower as it gets closer to the inner arm 11. The tapered structure of the first protrusion 1322 ensures a relatively stable and reliable connection between the first protrusion 1322 and the first mounting part 1321, while also ensuring good sealing and reducing resistance to the inner arm 11.

[0085] Based on any of the above embodiments, the second sealing ring 133 will be further described; such as Figure 5 , Figure 6 As shown, the second groove 1314 has two openings. The second groove 1314 opens on the end face of the sealing cap 131 near the inner arm 11, and the opening faces the inner arm 11. At the same time, it opens on the end face of the sealing cap 131 away from the outer arm 12, and the opening faces away from the outer arm 12.

[0086] like Figure 5 , Figure 6 As shown, the second sealing ring 133 includes a second mounting portion 1331 and a second protrusion 1332. The second protrusion 1332 is axially connected to the side of the second mounting portion 1331 away from the outer arm 12. The second mounting portion 1331 and the second protrusion 1332 are generally annular structures. The cross-section of the second mounting portion 1331 is generally rectangular, while the second protrusion 1332 is an irregularly shaped structure. The second mounting portion 1331 is disposed within the second groove 1314, and the second mounting portion 1331... The outer wall fits tightly against the second groove 1314. The inner diameter of the second mounting part 1331 is equal to or slightly larger than the outer diameter of the inner arm 11, so that the inner side of the second mounting part 1331 can fit tightly against the outer side of the inner arm 11, achieving good sealing. The inner diameter of the second protrusion 1332 is smaller than the inner diameter of the second mounting part 1331 and smaller than the outer diameter of the inner arm 11, so that the second protrusion 1332 can fit tightly against the inner arm 11, ensuring sealing.

[0087] Furthermore, such as Figure 5As shown, along the axial direction, the radial width of the second protrusion 1332 decreases in the direction away from the second mounting portion 1331, and the second protrusion 1332 extends in the direction away from the outer arm 12, so that the end of the second protrusion 1332 away from the second mounting portion 1331 exceeds the axial opening end face of the second groove 1314. Simultaneously, along the radial direction, the second protrusion 1332 extends towards the inner arm 11, so that the end of the second protrusion 1332 away from the sealing cap 131 exceeds the radial end face of the second groove 1314. This gives the second protrusion 1332 a tendency to wrap around the inner arm 11 outwards and inwards, allowing it to firmly adhere to the outer wall of the inner arm 11, thereby ensuring the sealing performance of the second sealing ring 133.

[0088] Specifically, such as Figure 5 , Figure 6 As shown, the second protrusion 1332 includes a limiting end connected to the second mounting portion 1331 and a free end away from the second mounting portion 1331. The radial width of the limiting end is smaller than the radial width of the second mounting portion 1331, and the radial width of the free end is smaller than the radial width of the limiting end. This ensures that the connection area between the second protrusion 1332 and the second mounting portion 1331 is large, the connection stability is good, and the thickness of the free end is small, so that the elasticity will not be reduced due to excessive thickness. This ensures that the second sealing ring 133 has good resilience performance and ensures the sealing effect.

[0089] Furthermore, such as Figure 5 As shown, in the radial direction, the inner end of the second protrusion 1332 is a tapered structure, the free end of the second protrusion 1332 is a pointed tip, and this end extends beyond the radial and axial opening end face of the second groove 1314.

[0090] It should be noted that the various embodiments of this application can be arbitrarily combined into new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0091] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A telescopic boom for rock drilling apparatus, characterized in that The invention relates to a telescopic arm for rock drilling equipment, comprising: an inner arm (11); an outer arm (12) configured to be sleeved on the inner arm (11); a sealing mechanism (13) provided at an open end of the outer arm (12) and comprising a sealing gland (131) sleeved on the outer arm (12) and a sealing assembly acting radially between the sealing gland (131) and the inner arm (11); an adjusting pad (134) is provided between the sealing gland (131) and the outer arm (12), and the adjusting pad (134) is used for axially sealing the opening of the outer arm (12).

2. The telescopic arm for rock drilling equipment according to claim 1, wherein a sealing groove for mounting the sealing assembly is provided on the sealing gland (131), and the sealing groove is recessed in a direction away from the inner arm (11) in the radial direction; wherein the inner diameter of the sealing assembly is smaller than the outer diameter of the inner arm (11).

3. The telescopic arm for rock drilling equipment according to claim 2, wherein the sealing assembly comprises a first sealing ring (132) and a second sealing ring (133), and the first sealing ring (132) and the second sealing ring (133) are spaced apart in the axial direction; the sealing groove is divided into a first groove (1313) and a second groove (1314), the first groove (1313) is used for mounting the first sealing ring (132), and the second groove (1314) is used for mounting the second sealing ring (133).

4. The telescopic arm for rock drilling equipment according to claim 3, wherein the first groove (1313) is opened on the end face of the sealing gland (131) close to the inner arm (11); the first sealing ring (132) comprises a first mounting portion (1321) and a first protruding portion (1322), the first mounting portion (1321) is arranged in the first groove (1313), and the first protruding portion (1322) is connected to the radially inner side of the first mounting portion (1321); wherein the axial width of the first protruding portion (1322) decreases in a direction away from the first mounting portion (1321).

5. The telescopic arm for rock drilling equipment according to claim 4, wherein the end of the first protruding portion (1322) away from the first mounting portion (1321) exceeds the radially open end face of the first groove (1313); the inner end of the first protruding portion (1322) is a tapered structure; the inner diameter of the first protruding portion (1322) is smaller than the outer diameter of the inner arm (11).

6. The telescopic arm for rock drilling equipment according to claim 3, wherein the second groove (1314) is opened on the end face of the sealing gland (131) close to the inner arm (11) and on the end face of the sealing gland (131) away from the outer arm (12); the second sealing ring (133) comprises a second mounting portion (1331) and a second protruding portion (1332), the second mounting portion (1331) is arranged in the second groove (1314), and the second protruding portion (1332) is connected to the axially outer side of the second mounting portion (1331). The radial width of the second protruding part (1332) decreases in a direction away from the second mounting part (1331).

7. The telescopic arm for rock drilling rig according to claim 6, characterized in that, The end of the second protruding part (1332) away from the second mounting part (1331) exceeds the axial opening end surface of the second groove (1314); The end of the second protruding part (1332) away from the sealing gland (131) exceeds the radial opening end surface of the second groove (1314); The inner end of the second protruding part (1332) is in a conical structure in the radial direction; The inner diameter of the second protruding part (1332) is smaller than the inner diameter of the second mounting part (1331), and the inner diameter of the second protruding part (1332) is smaller than the outer diameter of the inner arm (11).

8. The telescopic arm for rock drilling rig according to any one of claims 1 to 7, characterized in that, The sealing gland (131) comprises a first connecting part (1311) and a second connecting part (1312), the first connecting part (1311) is sleeved on the outer arm (12), and the second connecting part (1312) is sleeved on the inner arm (11); The adjusting pad (134) is located between the second connecting part (1312) and the opening end of the outer arm (12), and the sealing assembly is located between the second connecting part and the inner arm (11).

9. The telescopic arm for rock drilling rig according to claim 8, characterized in that, The sealing gland (131) is provided with a connecting hole (1316) penetrating the second connecting part (1312) in the axial direction; The adjusting pad (134) is provided with a matching hole (1341) penetrating the adjusting pad (134) in the axial direction; The opening end of the outer arm (12) is provided with a mounting groove (121), and the matching hole (1341), the connecting hole (1316) and the mounting groove (121) are coaxially arranged to allow a same connecting piece (135) to be inserted; The inner diameter of the adjusting pad (134) is greater than the outer diameter of the inner arm (11), and the inner diameter of the adjusting pad (134) is smaller than the inner diameter of the outer arm (12).

10. The telescopic arm for rock drilling rig according to claim 8, characterized in that, The third groove (1315) is provided on the inner side wall of the first connecting part (1311) in the radial direction and is recessed in the radial direction; The third sealing ring is arranged in the third groove (1315); The inner diameter of the second connecting part (1312) is smaller than the inner diameter of the first connecting part (1311), and the inner diameter of the second connecting part (1312) is greater than the outer diameter of the inner arm (11).

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