Drill rod, rock stratum drilling device, and rock stratum drilling machine

Abstract

The utility model provides a kind of drill rod for punching, rock stratum puncher and rock stratum puncher, belong to engineering machinery field.Punching drill rod includes drill rod main part and drill rod head, drill rod head is connected with drill rod main part or drill rod sleeve on drill rod main part by connector, and connector is arranged in the mounting groove of lower end of drill rod main part or lower blind hole of lower end of drill rod sleeve.Connector is elastic structure, and connector includes multiple adhering pieces;Drill rod head includes connecting portion and rock breaking portion, and rock breaking portion is arranged below connecting portion and located outside lower blind hole;Connecting portion is connected with multiple adhering pieces.The probability of connector damage is reduced due to the isolation of connector and external broken stone.In addition, due to the adoption of elastic connection structure, the assembly of drill rod head and drill rod main part also becomes more convenient.

Description

Technical Field

[0001] This utility model relates to the field of rock drilling, specifically to a drilling rod, a rock drilling device, and a rock drilling machine. Background Technology

[0002] A drilling device generally includes a hammer cylinder and a drill rod. One end of the hammer cylinder is connected to a support, and the other end is connected to the hammer rod. The hammer rod is located inside the support. The hammer cylinder drives the hammer rod to impact the drill rod, and the drill rod transmits the impact force to the rock strata to achieve crushing or hole formation.

[0003] To facilitate the replacement of the drill bit, the drill bit is usually detachably connected to the drill body via a connector. However, in existing technologies, the connector between the drill bit and the drill body is usually exposed. Because the connector is exposed, it is in direct contact with the crushed stone and is easily damaged, which in turn affects the efficiency of the operation. Utility Model Content

[0004] The purpose of this invention is to provide a drilling rod with a replaceable drill bit, which effectively alleviates the above-mentioned problems.

[0005] Another objective of this invention is to provide a rock drilling machine that uses the aforementioned drilling rod.

[0006] This utility model is implemented as follows: A drilling rod includes a rod body and a rod sleeve. The drill rod sleeve is detachably connected to the lower end of the drill rod body; The lower end of the drill rod sleeve is provided with a lower blind hole, the lower blind hole opening downwards, and a connector is fixedly connected in the lower blind hole. The connector is an elastic structure and includes multiple fitting pieces. The drill rod head includes a connecting part and a rock-breaking part. The rock-breaking part is located below the connecting part and outside the lower blind hole. The connecting part is clamped in the multiple fitting pieces.

[0007] Furthermore, the free end of the bonding piece extends downward, causing the plurality of bonding pieces to form an opening downward; the bonding piece has a bonding surface for engaging with the connecting portion; The connecting part can expand or tighten the plurality of bonding pieces.

[0008] Furthermore, the drill bit head also includes a positioning part; the positioning part is disposed on the upper end face of the rock breaking part, and the connecting part is disposed on the upper end face of the positioning part; when the positioning part is inserted into the lower blind hole, the upper end face of the rock breaking part abuts against the lower end face of the drill bit sleeve.

[0009] Furthermore, a radially extending slot is provided on the lower end face of the drill rod sleeve or the upper end face of the rock-breaking part, the slot being used to insert a rod-shaped tool.

[0010] Furthermore, the connecting part includes a connector head, which has a structure that is thicker in the middle and relatively thinner at both ends; the connector includes two opposing mating pieces, which clamp and fix the connector head. Alternatively, the connecting portion is a connecting cavity with an opening facing upwards; the connector includes two oppositely arranged mating pieces that extend into the connecting cavity.

[0011] Furthermore, a recess is provided on the lower side of the drill rod body, and the lower end of the recess does not extend to the lower end face of the drill rod body; an upper blind hole is provided at the upper end of the drill rod sleeve, and the lower end of the drill rod body is inserted into the upper blind hole; a mounting through hole is provided on the side of the drill rod sleeve at a position corresponding to the recess, and a limiting block is detachably provided in the mounting through hole, the inner end of the limiting block extending into the corresponding recess; when the lower end of the drill rod body abuts against the bottom of the upper blind hole, a gap is provided between the limiting block and the upper end of the recess.

[0012] A drilling rod includes a rod body and a rod head. A mounting groove is provided on the lower end face of the rod body, with the opening of the mounting groove facing downwards. A connector is fixedly disposed in the mounting groove. The connector is an elastic structure and includes multiple fitting pieces. The rod head includes a connecting portion and a rock-breaking portion. The rock-breaking portion is disposed below the connecting portion and outside the mounting groove. The connecting portion is clamped within the multiple fitting pieces.

[0013] Furthermore, the drill bit head also includes a positioning part; the positioning part is disposed on the upper end face of the rock breaking part, and the connecting part is disposed on the upper end face of the positioning part; when the positioning part is inserted into the mounting groove, the upper end face of the rock breaking part abuts against the lower end face of the drill bit body.

[0014] Furthermore, the connecting part includes a connector head, which has a structure that is thicker in the middle and relatively thinner at both ends; the connector includes two opposing mating pieces, which clamp and fix the connector head. Alternatively, the connecting portion is a connecting cavity with an opening facing upwards; the connector includes two oppositely arranged mating pieces that extend into the connecting cavity.

[0015] Furthermore, the free ends of the plurality of bonding pieces extend downward, so that the plurality of bonding pieces form openings downward; the bonding pieces have clamping surfaces facing obliquely upward; the connecting portion can open or tighten the plurality of bonding pieces.

[0016] Furthermore, the lower end face of the main body of the drill rod abuts against the upper end face of the rock-breaking section; A radially extending slot is provided on the lower end face of the main body of the drill rod or on the upper end face of the rock-breaking part, and the slot can be used to insert a rod-shaped tool.

[0017] A rock drilling device includes a drilling support, a hammer rod, a hammer rod cylinder, and a chisel rod; the hammer rod and the hammer rod cylinder are disposed inside a cylindrical drilling support, one end of the hammer rod cylinder is connected to the drilling support, and the other end is connected to the hammer rod; The upper end of the drill rod is installed inside the drilling bracket and can move up and down. The drill rod is located below the hammer rod.

[0018] A rock drilling machine includes a carrier and a rock drilling device, wherein the drilling device is installed on the carrier.

[0019] The beneficial effects of this utility model are: The drilling rod obtained by the present invention, through the above design, has a connector located in the lower blind hole at the lower end of the drill rod sleeve (or in the mounting groove at the lower end of the drill rod body), thereby isolating the connector from external gravel and reducing the probability of connector damage. Furthermore, the use of an elastic connection structure makes the assembly of the drill rod head and the drill rod body more convenient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the rock drilling machine provided in Example 1; Figure 2 This is an exploded view of the drilling rod provided in Example 1; Figure 3 This is a schematic diagram of the drill rod provided in Example 1 after the main body of the drill rod has been removed; Figure 4 This is a cross-sectional view of the drilling rod provided in Embodiment 1; Figure 5 This is an exploded view of the drill rod head and drill rod sleeve at the first angle provided in Embodiment 1; Figure 6 This is an exploded view of the drill bit head and drill bit sleeve at the second angle provided in Example 1; Figure 7 This is an exploded view of the drilling rod provided in Example 3; Figure 8This is an exploded view of the connector and the drill bit head that the bonding pad can tighten; Figure 9 This is a cross-sectional view of a connector and a drill bit head that can be tightened by the bonding pad.

[0021] Icons: 1-Drill rod; 11-Drill rod body; 112-Recess; 113-Limiting block; 12-Drill rod sleeve; 121-Upper blind hole; 122-Lower blind hole; 123-Mounting through hole; 13-Drill rod head; 131-Rock breaking part; 132-Positioning part; 133-Connecting part; 135-Slot; 14-Connector; 141-Connecting piece; 142-Adhesive piece; 2-Drilling device; 21-Drilling bracket; 3-Rock drilling machine; 31-Carrier. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0023] by Figure 1 For reference, the boom is located in front of the vehicle body. In the horizontal plane, the boom's front-to-back direction is longitudinal, and the boom's width direction is transverse. Example

[0024] Please refer to Figure 1 This embodiment provides a rock drilling machine 3, which includes a carrier 31 and a rock drilling device 2. The carrier 31 can be the walking device, body and boom of an excavator; the rock drilling device 2 is installed at the front end of the boom.

[0025] Please refer to Figures 1-4 The rock drilling device 2 includes a drilling support 21, a hammer rod (not shown in the figure), a hammer rod cylinder (not shown in the figure), and a drill rod 1. The drilling support 21 is a vertically arranged cylindrical structure. The hammer rod and hammer rod cylinder are both vertically arranged inside the drilling support 21. The upper end of the hammer rod cylinder is hinged to the upper end of the drilling support 21, and the lower end is hinged to the hammer rod. The upper end of the drill rod 1 is installed inside the drilling support 21 and can move up and down. The drill rod 1 is located below the hammer rod. When the hammer rod cylinder extends or retracts, the lower end of the hammer rod impacts the drill rod 1, and the lower end of the drill rod 1 impacts the rock strata, thereby drilling a hole in the rock strata.

[0026] The drill rod 1 includes a drill rod body 11, a drill rod sleeve 12, and a drill rod head 13. The drill rod body 11 has a cylindrical structure, with two symmetrical recesses 112 on its lower side. The two recesses 112 are blind holes located on both sides of the drill rod body 11. The lower end of the recess 112 is spaced from the lower end of the drill rod body 11, meaning that the recess 112 does not extend to the end face of the lower end of the drill rod body 11. Alternatively, only one recess may be provided, and the recess 112 may be configured as a strip-shaped groove extending along the height direction of the drill rod body 11.

[0027] In other embodiments, the drill bit head 13 may not need to be set separately. In this case, the lower end of the drill bit sleeve 12 is set to be conical or flat, and the lower end of the drill bit sleeve 12 is directly used for drilling.

[0028] The upper end face of the drill rod sleeve 12 is provided with an upper blind hole 121, and the lower end is connected to the drill rod head 13. When the drill rod sleeve 12 is installed on the drill rod body 11, the lower end of the drill rod body 11 is inserted into the upper blind hole 121 of the drill rod sleeve 12. The side of the drill rod sleeve 12 is provided with a mounting through hole 123 at the position corresponding to the recess 112, and a limiting block 113 is detachably provided in the mounting through hole 123. When the limiting block 113 is installed in the mounting through hole 123, the inner end of the limiting block 113 is inserted into the corresponding recess 112. Since the lower end of the recess 112 does not extend to the lower end face of the drill rod body 11, when the drill rod is pulled out of the rock strata, the inner end of the limiting block 113 abuts against the lower end of the recess 112, thereby preventing the drill rod sleeve 12 from falling off the drill rod body 11.

[0029] Regarding the limiting block 113, the limiting block 113 can be a screw or a limiting pin. When a screw is used, the mounting through hole 123 is threaded, the screw mates with the mounting through hole 123, and the inner end of the screw mates with the recess 112, limiting the vertical position of the drill rod sleeve 12 and the drill rod body 11. When the limiting block 113 is a limiting pin, the mounting through hole does not need to be threaded, the limiting pin mates with the mounting through hole, and the end of the limiting pin mates with the corresponding recess 112, limiting the vertical position of the drill rod sleeve 12 and the drill rod body 11. The limiting pin is further limited by a cover plate or other means to prevent the limiting pin from falling out of the mounting through hole.

[0030] The advantage of this structure is that the connection between the drill rod sleeve 12 and the drill rod body 11 is typically a pin. Since the outer diameter of the drill rod sleeve 12 is larger than the diameter of the drill rod body 11, when the drill rod 1 is fully inserted into the rock and needs to be moved upwards out of the rock layer, the drill rod sleeve 12 will experience significant resistance from the rock layer, and the connection between the drill rod sleeve 12 and the drill rod body 11 will experience significant shear force. This results in a relatively large pin diameter. If the pin penetrates the drill rod body 11, the strength of the drill rod body 11 will be significantly reduced, easily leading to breakage at the pin hole. In this embodiment, the positioning pin is located inside the relatively large drill rod sleeve 12. The relatively large diameter of the positioning pin does not affect the strength of the drill rod sleeve 12. The length of the inner end of the positioning pin located in the recess 112 does not need to be too large, therefore it does not need to penetrate the drill rod body 11, reducing the impact on the strength of the drill rod body 11.

[0031] During drilling operations, the lower end of the drill rod body 11 abuts against the bottom of the blind hole 121 on the upper part of the drill rod sleeve 12. Furthermore, a gap is provided between the limiting block 113 and the upper end of the recess 112, ensuring that when the bottom of the blind hole 121 contacts the lower end of the drill rod body 11, the portion of the limiting block 113 located in the recess 112 does not contact the upper end of the recess 112, thus preventing damage to the limiting block 113 due to the shearing force generated by the impact. Since the drill rod body 11 experiences a very large impact force from the hammer, if this impact force were transmitted to the drill rod sleeve 12 through the limiting block 113, it could easily damage the limiting block 113. Therefore, the above design effectively improves the overall service life of the drill rod 1.

[0032] After the drilling operation is completed, when the drill rod body 11 pulls the drill rod sleeve 12 out of the rock hole, the limiting block 113 abuts against the lower end of the recess 112, thereby causing the drill rod body 11 to move the drill rod sleeve 12 upward through the limiting block 113. Since the drill rod sleeve 12 is mainly subjected to resistance from the rock layer at this time, and this resistance is much smaller than the impact force of the hammer rod, this resistance will not cause damage to the limiting block 113.

[0033] In this embodiment, the maximum outer diameter of the drill rod sleeve 12 is 480 mm, the diameter of the drill rod body 11 is 250 mm, the effective rock penetration depth of the drill rod 1 is 2460 mm, the weight of the drill rod body 11 is 0.967 tons, the weight of the drill rod sleeve 12 is 0.47 tons, and the total weight of the drill rod 1 is 1.44 tons. Without the drill rod sleeve 12, if the overall shape of the drill rod 1 is the same as the maximum shape of the drill rod sleeve 12, the weight of the drill rod 1 would exceed 3.3 tons to obtain a hole with the same shape and depth. The maximum outer diameter of the drill rod sleeve 12 is larger than the diameter of the drill rod body 11, allowing for a relatively larger drilling width while maintaining a relatively smaller total weight. When the hammer impacts the drill rod 1, the weight of the drill rod 1 leads to energy loss; the greater the weight of the drill rod 1, the greater the energy loss. Therefore, the above design minimizes the loss of impact energy while achieving a larger drilling width.

[0034] In addition, the drill rod sleeve 12 is detachably connected to the drill rod body 11. When the drill rod sleeve 12 is worn too much, only the drill rod sleeve 12 needs to be replaced, instead of replacing the entire drill rod 1, thereby reducing costs.

[0035] Furthermore, the drill bit head 13 and the drill bit sleeve 12 are detachably connected. Specifically, the lower end of the drill bit sleeve 12 is provided with a lower blind hole 122, the opening of which faces downward; a connector 14 is fixedly connected in the lower blind hole 122, the connector 14 being used to fix the drill bit head 13; the weight of the drill bit head 13 is 0.05 tons.

[0036] Please refer to Figure 2 The connector 14 is a symmetrical structure formed by bending a strip of metal. The metal strip is elastic and includes a connecting piece 141 and two mating pieces 142. The two mating pieces 142 are arranged at intervals relative to each other and are connected by the connecting piece 141. The connecting piece 141 is fixedly connected to the drill sleeve 12 by screws. Furthermore, the free ends of the two mating pieces extend downward, forming downward openings on the two mating pieces.

[0037] The bonding sheet has a guide surface and a clamping surface. The guide surface faces downward and is used to guide the connecting part 133 into the clamping surface when installing the drill bit head. The clamping surface faces upward and can transmit the upward force to the connecting part 133 when the clamping surface contacts the connecting part 133, thus preventing the drill bit head 13 from falling off.

[0038] The drill bit 13 includes a rock-breaking part 131, a positioning part 132, and a connecting part 133. The rock-breaking part 131 is a conical structure, the positioning part 132 is a cylindrical structure with a diameter smaller than the diameter of the upper end face of the rock-breaking part 131, and the connecting part 133 is disposed on the positioning part 132, with a diameter smaller than the diameter of the positioning part 132.

[0039] Furthermore, the connecting part 133 includes a connector, which has a structure that is thicker in the middle and relatively thinner at both ends. When the drill rod head 13 is connected to the drill rod sleeve 12, the lower end face of the drill rod head 13 abuts against the upper end face of the rock-breaking part 131, the positioning part 132 is inserted into the lower blind hole 122 of the drill rod sleeve 12, and the connector is engaged between the two mating pieces 142 of the connector 14. Since the rock-breaking part 131 of the drill rod head 13 has a conical structure, and the diameter of the upper end face of the rock-breaking part 131 is approximately equal to the diameter of the lower end face of the drill rod sleeve 12, the resistance from the rock layer to the drill rod head 13 is relatively small when the drill rod 1 is pulled out of the rock layer; therefore, the clamping force of the connector 14 is sufficient to firmly fix the drill rod head 13 to the drill rod sleeve 12.

[0040] Connector 14 is an elastic body, which allows the drill bit head 13 and drill bit sleeve 12 to fit tightly during operation. Compared with pin or bolt fixing, this reduces the loss of impact energy caused by loose fit between the drill bit body 11 and drill bit sleeve 12 during vertical impact. In addition, the connector 14 is not exposed, which avoids the possibility of friction and contact between the connector 14 and the rock strata, and the connector 14 is not easily damaged.

[0041] Connector 14 can be located in the middle of the lower blind hole 122.

[0042] To facilitate the removal of the drill bit head 13, a radially extending slot 135 is provided on the upper end face of the rock-breaking section 131; when it is necessary to remove the drill bit head 13, a pry bar can be inserted into the slot 135 to pry the drill bit head 13 out. Alternatively, as... Figure 5 and Figure 6 The slot 135 can also be set on the lower end face of the drill rod sleeve 12.

[0043] It should be noted that the connection between the drill bit head 13 and the drill bit sleeve 12 can also adopt other commonly used disassembly and connection structures, and is not limited to the structure provided in this embodiment. Alternatively, the drill bit head 13 can also be integrally formed with the drill bit sleeve 12. Alternatively, the connector 14 can also include three or more mating pieces 142.

[0044] Regarding the connection and arrangement of connector 14 and drill bit 13, in addition to the structure described above, it can also be arranged as follows: Please refer to Figure 8 and Figure 9The connecting part 133 is a connecting cavity with an upward opening; the connecting cavity is a cavity with a larger central portion and a smaller opening, located in the middle of the positioning part 132; the bonding piece 142 consists of two symmetrically arranged circular springs, with the lower part of the bonding piece 142 having a structure that expands to both sides. The bonding piece 142 can overcome tension to enter the connecting cavity and obtain continuous tension; the relatively small width of the opening of the connecting part 133 and the connecting cavity can obtain a decomposed force from the upward-facing bonding piece 142, preventing the bonding piece 142 from easily coming out of the connecting cavity, and the connecting part 133 can tighten the bonding piece 142; and make the drill head 13 and the drill sleeve 12 fit tightly together.

[0045] When a large hole diameter is required, the drill rod sleeve 12 usually has a relatively large horizontal cross-section. When the drill rod needs to be removed from the rock strata, the resistance borne by the drill rod sleeve 12 is usually large. Due to the limitation of installation space, the elastic connector is difficult to provide the required clamping force. The setting of the limit block 113 can solve this problem well through rigid contact.

[0046] Normally, the snap-fit ​​structure between the drill bit 13 and the connector 14 is relatively complex. Since the connector 14 only needs to snap-fit ​​one end with the drill bit 13, its structure is relatively simple, which helps to reduce costs. Since the connector 14 can be located in the middle of the lower blind hole 122, one connector 14 can complete the fixation of the drill bit 13. Compared with the method that requires multiple connecting devices, it helps to reduce costs and improve the convenience of installation. Example

[0047] Please refer to Figure 8 This embodiment provides another type of drilling rod 1, which differs from the drilling rod 1 in Embodiment 1 in that the connection method between the rod head 13 and the rod body 11 is different.

[0048] Specifically, a mounting groove is provided on the lower end face of the drill rod body 11, and the mounting groove is similar in structure to the lower blind hole 122 in Embodiment 1; the opening of the mounting groove faces downward, and a connector 14 is fixedly installed in the mounting groove, which has the same structure as in the embodiment. In this embodiment, it is equivalent to removing the drill rod sleeve 12, and the drill rod head 13 is directly connected to the drill rod body 11 through the connector 14.

[0049] Connector 14 can be positioned in the middle of the mounting groove.

[0050] A radially extending slot 135 is provided on the lower end face of the drill rod body 11 or the upper end face of the rock breaking part 131, and the slot 135 can be used to insert a rod-shaped tool.

[0051] The advantage of this structure is that when the drill bit 13 is damaged, only the drill bit 13 needs to be replaced, which helps save on operating costs. Furthermore, the connector 14 ensures a tight fit between the upper end of the drill bit 13 and the lower end of the drill body 11, reducing the loss of impact energy caused by a loose fit between the drill bit 13 and the drill body 11 during impact. Normally, the engagement between the drill bit 13 and the connector 14 is relatively complex; since the connector 14 only needs to engage with the drill bit 13 at one end, its structure is relatively simple, which helps reduce costs. Because the connector 14 can be located in the center of the mounting groove, one connector 14 can complete the fixation of the drill bit 13, which is more cost-effective and improves installation convenience compared to methods requiring multiple connecting devices.

[0052] Regarding the connection and arrangement of connector 14 and drill bit 13, in addition to the structure described above, it can also be arranged as follows: Please refer to Figure 8 and Figure 9 The connecting part 133 is a connecting cavity with an upward opening; the connecting cavity is a cavity with a larger central portion and a smaller opening, located in the middle of the positioning part 132; the bonding piece 142 consists of two symmetrically arranged circular springs, with the lower part of the bonding piece 142 having a structure that expands to both sides. The bonding piece 142 can overcome tension to enter the connecting cavity and obtain continuous tension; the relatively small width of the opening of the connecting part 133 and the connecting cavity can obtain a decomposed force from the upward-facing bonding piece 142, preventing the bonding piece 142 from easily coming out of the connecting cavity, and the connecting part 133 can tighten the bonding piece 142; and make the drill head 13 and the drill sleeve 12 fit tightly together.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A drilling rod, characterized in that, Includes the drill rod body, drill rod sleeve, and drill rod head. The drill rod sleeve is detachably connected to the lower end of the drill rod body; The lower end of the drill rod sleeve is provided with a lower blind hole, the opening of the lower blind hole faces downward, and a connector is fixedly connected in the lower blind hole. The connector is an elastic structure and includes multiple fitting pieces. The drill rod head includes a connecting part and a rock-breaking part. The rock-breaking part is located below the connecting part and outside the lower blind hole. The connecting part is fitted and connected to the multiple fitting pieces.

2. The drilling rod according to claim 1, characterized in that: The free ends of the bonding pieces extend downward, causing the plurality of bonding pieces to form openings downward; the bonding pieces have bonding surfaces for engaging with the connecting portion. The connecting part can expand or tighten the plurality of bonding pieces.

3. The drilling rod according to claim 2, characterized in that: The drill bit head also includes a positioning part; the positioning part is disposed on the upper end face of the rock breaking part, and the connecting part is disposed on the upper end face of the positioning part; when the positioning part is inserted into the lower blind hole, the upper end face of the rock breaking part abuts against the lower end face of the drill bit sleeve.

4. The drilling rod according to claim 3, characterized in that: The lower end face of the drill bit sleeve or the upper end face of the rock-breaking part is provided with a radially extending slot, which can be used to insert a rod-shaped tool.

5. The drilling rod according to claim 1, characterized in that: The connecting part includes a connector, which has a structure that is thicker in the middle and relatively thinner at both ends; the connector includes two mating pieces arranged opposite to each other, which clamp and fix the connector. Alternatively, the connecting portion is a connecting cavity with an opening facing upwards; the connector includes two oppositely arranged mating pieces that extend into the connecting cavity.

6. The drilling rod according to claim 1, characterized in that: A recess is provided on the lower side of the drill rod body, and the lower end of the recess does not extend to the lower end face of the drill rod body; an upper blind hole is provided at the upper end of the drill rod sleeve, and the lower end of the drill rod body is inserted into the upper blind hole; a mounting through hole is provided on the side of the drill rod sleeve at a position corresponding to the recess, and a limiting block is detachably provided in the mounting through hole, the inner end of the limiting block extending into the corresponding recess; when the lower end of the drill rod body abuts against the bottom of the upper blind hole, a gap is provided between the limiting block and the upper end of the recess.

7. A drilling rod, characterized in that, The device includes a drill rod body and a drill rod head. The lower end face of the drill rod body is provided with a mounting groove, the opening of which faces downward. A connector is fixedly disposed in the mounting groove. The connector is an elastic structure and includes multiple fitting pieces. The drill rod head includes a connecting part and a rock-breaking part. The rock-breaking part is disposed below the connecting part and outside the mounting groove. The connecting part is clamped in the multiple fitting pieces.

8. The drilling rod according to claim 7, characterized in that, The drill bit head also includes a positioning part; the positioning part is disposed on the upper end face of the rock breaking part, and the connecting part is disposed on the upper end face of the positioning part; when the positioning part is inserted into the mounting groove, the upper end face of the rock breaking part abuts against the lower end face of the drill bit body.

9. The drilling rod according to claim 7, characterized in that... The connecting part includes a connector, which has a structure that is thicker in the middle and relatively thinner at both ends; the connector includes two mating pieces arranged opposite each other; the two mating pieces clamp and fix the connector. Alternatively, the connecting portion is a connecting cavity with an opening facing upwards; the connector includes two oppositely arranged mating pieces that extend into the connecting cavity.

10. The drilling rod according to claim 7, characterized in that, The free ends of the plurality of bonding pieces extend downward, forming openings downward; the bonding pieces have clamping surfaces facing obliquely upward; the connecting portion can open or tighten the plurality of bonding pieces.

11. The drilling rod according to claim 7, characterized in that, The lower end face of the main body of the drill rod abuts against the upper end face of the rock-breaking part; A radially extending slot is provided on the lower end face of the main body of the drill rod or on the upper end face of the rock-breaking part, and the slot can be used to insert a rod-shaped tool.

12. A rock drilling device, characterized in that, The rock drilling device includes a drilling support, a hammer rod, a hammer rod cylinder, and a drill rod as described in any one of claims 1-11; the hammer rod and the hammer rod cylinder are disposed inside the cylindrical drilling support, one end of the hammer rod cylinder is connected to the drilling support, and the other end is connected to the hammer rod; The upper end of the drill rod is installed inside the drilling bracket and can move up and down. The drill rod is located below the hammer rod.

13. A rock drilling machine, characterized in that, It includes a carrier and the rock drilling device as described in claim 12, wherein the drilling device is mounted on the carrier.

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