Lifting structure of drill jumbo cab

Abstract

A lifting structure of a drill jumbo cab effectively solves the problem that when a hydraulic lifting mechanism is arranged in the center of the bottom of the cab, the stability of the cab is poor due to the fact that the cab is affected by unbalance loading. Comprising a supporting platform arranged at the top of the drill jumbo and a cab located above the supporting platform, and a lifting assembly is arranged between the cab and the supporting platform; the lifting assembly comprises a shear shank, the upper end and the lower end of one side of the shear shank are rotationally connected with the cab and the supporting platform respectively, and the upper end and the lower end of the other side of the shear shank are slidably connected with the cab and the supporting platform respectively. Stable supporting can be formed among the shear shank, the cab and the supporting platform, the cab is not prone to being affected by unbalance loading, meanwhile, the hydraulic cylinder is located at the top of the shear shank and ascends and descends along with the shear shank, the occupied space of a power source is reduced, and the safety of the hydraulic cylinder in the ascending and descending process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rock drilling trolleys, in particular to a lifting structure of a driving cab of a rock drilling trolley. Background Art

[0002] During the tunnel construction process, there will be obstacles around the rock drilling rig, which limits the operator's field of vision and creates a large blind spot, affecting the equipment construction operation. At the same time, in order to facilitate the driver to enter and exit the cab, the cab needs to be in a lower position, so the cab needs to have a lifting function. On the basis of making it convenient for the driver to enter and exit the cab, it is also convenient to observe the equipment during construction.

[0003] The Chinese patent with application number CN201720268578.4 discloses a liftable cab of a rock drilling trolley, including a cab, a frame and a lifting platform. The cab includes an operating room, a protective roof, and a roof lifting cylinder. The operating room is provided with a roof lifting cylinder on both sides, and the protective roof is placed on the roof lifting cylinder; the lifting platform includes an outer sleeve, a middle sleeve, an inner sleeve and a hydraulic cylinder that are nested from the outside to the inside, one end of the hydraulic cylinder is connected to the bottom of the outer sleeve, and the other end is connected to the top of the inner sleeve; a bracket is provided at the upper end of the lifting platform, and a shock-absorbing block is provided between the bracket and the cab. The height of the operating room and the protective roof of the rock drilling trolley can be adjusted, which solves the problem of the operator's line of sight being blocked during the construction process, thereby ensuring the construction accuracy and construction safety. The lifting cab of the utility model has a simple and compact structure, reduces the space occupied by the lifting mechanism of the whole machine, and has good practicality.

[0004] The existing rock drilling rigs still have the following problems for the lifting cab:

[0005] 1. Existing lifting devices generally use hydraulic cylinders as the main power source, but the cylinder size of the hydraulic lifting mechanism is large, resulting in large space occupancy and inconvenient installation.

[0006] 2. When the hydraulic lifting mechanism is set at the center of the bottom of the cab, the cab will be affected by the off-center load, resulting in poor stability, and there will be adverse factors such as flying stones hitting during the construction process, which will affect the service life of the cylinder. Utility Model Content

[0007] In view of the above problems, the present invention provides a lifting structure for a drilling rig cab, which has the advantages of more stable cab lifting, better safety of the power source of the lifting system, and emergency protection in harsh environments.

[0008] The technical solution is that the utility model comprises a support platform placed on the top of the rock drilling trolley, a cab located above the support platform, and a lifting assembly is arranged between the cab and the support platform;

[0009] The lifting assembly includes a scissor frame, the upper and lower ends of one side of the scissor frame are respectively rotatably connected to the cab and the support platform, the upper and lower ends of the other side of the scissor frame are respectively slidably connected to the cab and the support platform, the scissor frame includes two hinged connecting frames, the tops of the two connecting frames are provided with two symmetrically distributed hydraulic cylinders, and the two ends of the hydraulic cylinders are respectively rotatably connected to the tops of the corresponding connecting frames;

[0010] The two connecting frames are divided into an inner frame and an outer frame, and the tops of the inner frame and the outer frame are provided with a same limiting assembly, and the limiting assembly includes a connecting cylinder rotatably connected to the inner frame, a connecting rod coaxially slides in the connecting cylinder, a spiral connecting strip is fixed on the outer wall of the connecting rod, and a spiral groove matching the connecting strip is opened on the inner wall of the connecting cylinder, and a connecting block is rotatably connected to the top of the outer frame, and the end of the connecting rod away from the connecting cylinder is rotatably connected to the connecting block;

[0011] A connecting plate is coaxially fixed to one side of the connecting rod close to the connecting block, an annular groove is coaxially opened on the connecting plate, a connecting ring is rotatably connected in the annular groove, the connecting ring is a hollow structure, friction plates are slidably connected on both sides of the connecting ring, a connecting pipe is arranged on the top of the connecting ring, an oil cylinder is fixedly connected to the connecting block, a piston rod is arranged in the oil cylinder, a hydraulic push rod is arranged on one side of the piston rod passing through the oil cylinder, the hydraulic push rod is externally connected to an electric control device, and the oil cylinder and the connecting pipe are connected through a pipeline.

[0012] Preferably, a connecting plate is coaxially fixed to the middle of the connecting ring, and the connecting plate is provided with a plurality of notches evenly distributed around the circumference.

[0013] Preferably, the two friction plates are each provided with a plurality of through holes evenly distributed around the circumference, a positioning groove connected to the plurality of through holes is provided on one side of the friction plate located inside the connecting ring, a positioning plate is slidably connected in the positioning groove, a plurality of positioning pins matching the through holes are fixedly connected to the positioning plate, the positioning plate is connected to the positioning groove via a spring, and a plurality of positioning holes matching the positioning pins are provided on both side walls of the annular groove.

[0014] Preferably, a friction strip is provided on one side of the friction plate close to the inner wall of the annular groove.

[0015] Preferably, the friction plate and the connecting ring are connected by a piston-type sealing structure.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. Through the arrangement of the scissor frame, the connecting frame and the hydraulic cylinder, a stable support can be formed between the scissor frame, the cab and the supporting platform, so that the cab is not easily affected by the eccentric load, which greatly improves the stability of the cab during the lifting process. At the same time, the hydraulic cylinder used to provide lifting power is located on the top of the scissor frame and moves up and down with the lifting of the scissor frame, which not only reduces the space occupied by the power source, but also improves the safety of the hydraulic cylinder during lifting.

[0018] 2. Through the settings of the connecting tube, connecting rod and connecting strip, when the hydraulic cylinder drives the scissors frame to deform, due to the settings of the connecting strip and the spiral groove, the connecting rod rotates and slides in the connecting tube. When the cab reaches the specified height, the electric push rod is started through the external electronic control device, the piston rod slides in the cylinder, and the hydraulic oil enters the connecting ring through the pipeline. At this time, the friction plate moves outward under the push of the hydraulic oil and directly contacts the annular groove. The stepless adjustment method is adopted, which makes the adjustment height of the cab more free.

[0019] 3. Through the settings of positioning grooves, positioning plates, positioning pins and positioning holes, when the hydraulic oil enters the connecting ring, the positioning plate is also squeezed by the hydraulic oil. The positioning pins and positioning holes are used as emergency treatments. When the limit assembly fails and the connecting rod rotates again, the positioning pins will engage with the positioning holes and limit the connecting rod again, further improving the stability of the limit assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a plan view of the utility model.

[0021] Figure 2 It is a schematic diagram of the scissors frame and the connecting piece in the utility model.

[0022] Figure 3 It is a three-dimensional cross-sectional view of the scissor frame and the connecting piece in the utility model.

[0023] Figure 4 It is a schematic diagram of the oil cylinder and the connecting parts in the utility model.

[0024] Figure 5 It is a schematic diagram of the connecting ring in the utility model.

[0025] Figure 6 It is a schematic diagram of the connecting ring and the connecting piece in the utility model.

[0026] Figure 7 It is a schematic diagram of the annular groove in the utility model.

[0027] Figure 8 It is a schematic diagram of the connecting plate and the notch in the utility model.

[0028] Explanation of the symbols in the schematic diagram:

[0029] 1. Support platform; 2. Cab; 3. Scissor frame; 4. Connecting frame; 5. Hydraulic cylinder; 6. Inner frame; 7. Outer frame; 8. Connecting tube; 9. Connecting rod; 10. Connecting strip; 11. Connecting block; 12. Connecting plate; 13. Annular groove; 14. Connecting ring; 15. Friction plate; 16. Connecting pipe; 17. Oil cylinder; 18. Piston rod; 19. Hydraulic push rod; 20. Connecting plate; 21. Notch; 22. Positioning groove; 23. Positioning plate; 24. Positioning pin; 25. Positioning hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Depend on Figures 1 to 7 It is provided that the supporting platform 1 is placed on the top of the rock drilling trolley, the supporting platform 1 is fixedly arranged with the rock drilling trolley, a cab 2 is located above the supporting platform 1, and a lifting assembly is arranged between the cab 2 and the supporting platform 1;

[0032] Considering that when the hydraulic lifting mechanism is arranged at the central position of the bottom of the cab 2, the cab 2 will be affected by the eccentric load and will have poor stability, and there will be unfavorable factors such as flying stones hitting during the construction process, thereby affecting the service life of the oil cylinder 17, the lifting assembly includes a scissor frame 3, the upper and lower ends of one side of the scissor frame 3 are respectively rotatably connected to the cab 2 and the support platform 1, and the upper and lower ends of the other side of the scissor frame 3 are respectively slidably connected to the cab 2 and the support platform 1, and the scissor frame 3 includes two hinged connecting frames 4, and two symmetrically distributed hydraulic cylinders 5 are arranged on the top of the two connecting frames 4, and the two ends of the hydraulic cylinder 5 are respectively rotatably connected to the top of the corresponding connecting frame 4. Through the arrangement of the scissor frame 3, the connecting frame 4 and the hydraulic cylinder 5, a stable support can be formed between the scissor frame 3 and the cab 2 and the support platform 1, so that the cab 2 is not easily affected by the eccentric load, and the stability of the cab 2 during the lifting process is greatly improved. At the same time, the hydraulic cylinder 5 for providing lifting power is located at the top of the scissor frame 3 and moves up and down with the lifting of the scissor frame 3, which not only reduces the space occupied by the power source, but also improves the safety of the hydraulic cylinder 5 during lifting;

[0033] Considering that after the hydraulic cylinder 5 drives the scissor frame 3 to rise and fall to the specified position, in order to prevent the hydraulic cylinder 5 from directly bearing the entire load of the cab 2, a limit assembly is required to fix the scissor frame 3. The existing limit assembly usually adopts a plurality of limit holes or limit blocks to achieve multi-level limit. However, during the lifting process of the cab 2, the lifting height requires a more liberal limit method, otherwise it will inevitably fall into an embarrassing situation of being too high or too low. The two connecting frames 4 are divided into an inner frame 6 and an outer frame 7. The tops of the inner frame 6 and the outer frame 7 are provided with the same limit assembly, and the limit assembly includes a connecting tube 8 rotatably connected to the inner frame 6, and a connecting rod is coaxially slidable in the connecting tube 8. 9, a spiral connecting strip 10 is fixed on the outer wall of the connecting rod 9, a spiral groove matching the connecting strip 10 is opened on the inner wall of the connecting tube 8, a connecting block 11 is rotatably connected to the top of the outer frame 7, and the end of the connecting rod 9 away from the connecting tube 8 is rotatably connected to the connecting block 11. Through the connection tube 8, the connecting rod 9 and the connecting strip 10, when the hydraulic cylinder 5 drives the scissors frame 3 to deform, due to the setting of the connecting strip 10 and the spiral groove, the connecting rod 9 rotates and slides in the connecting tube 8. When the cab 2 reaches the specified height, it is only necessary to control the connecting rod 9 to stop rotating. The stepless adjustment method is adopted to make the adjustment height of the cab 2 more free;

[0034] In order to achieve stepless limiting of the connecting rod 9, a connecting disk 12 is coaxially fixed to one side of the connecting rod 9 close to the connecting block 11, and an annular groove 13 is coaxially opened on the connecting disk 12. A connecting ring 14 is rotatably connected in the annular groove 13. The connecting ring 14 is a hollow structure. Friction plates 15 are slidably connected to both sides of the connecting ring 14. A friction strip is provided on one side of the friction plate 15 close to the inner wall of the annular groove 13, which can be referred to as a car caliper. A connecting pipe 16 is provided on the top of the connecting ring 14, and an oil cylinder 17 is fixedly connected to the connecting block 11. A piston rod 18 is provided in the oil cylinder 17. A hydraulic push rod 19 is provided on one side of the plug rod 18 that passes through the oil cylinder 17. The hydraulic push rod 19 is externally connected to an electronic control device. The oil cylinder 17 is connected to the connecting pipe 16 through a pipeline. Through the connection plate 12, the annular groove 13, the connecting ring 14 and the oil cylinder 17, the electric push rod is started by the external electronic control device, the piston rod 18 slides in the oil cylinder 17, and the hydraulic oil enters the connecting ring 14 through the pipeline. At this time, the friction plate 15 moves outward under the push of the hydraulic oil and directly contacts the annular groove 13. Referring to the braking system of the car, no matter what position the connecting rod 9 is in, the friction plate 15 can effectively limit the connecting rod 9.

[0035] refer to Figure 8As shown, to further supplement the structure of the connecting ring 14, a connecting plate 20 is coaxially fixed in the middle of the connecting ring 14, and a plurality of circumferentially evenly distributed notches 21 are opened on the connecting plate 20. The hydraulic oil inside the connecting ring 14 is in a balanced state, so that the friction plate 15 can generate effective resistance with the annular groove 13.

[0036] refer to Figure 6 and Figure 7 As shown, when the load on the cab 2 is heavier, the higher the height of the cab 2 is, the greater the impact of the external environment is. For example, in a strong wind in bad weather, the cab 2 is likely to shake significantly, and in severe cases, the limit of the lifting assembly may fail. In order to further improve the stability of the limit assembly, the two friction plates 15 are each provided with a plurality of through holes evenly distributed around the circumference, and one side of the friction plate 15 located inside the connecting ring 14 is provided with a positioning groove 22 connected to the plurality of through holes, a positioning plate 23 is slidably connected in the positioning groove 22, and a plurality of positioning pins 24 matching the through holes are fixedly connected to the positioning plate 23, and the positioning plate 23 is connected to the positioning groove 22 by a spring, and the annular groove 1 A plurality of positioning holes 25 matching with the positioning pins 24 are provided on the two side walls of 3. Through the positioning groove 22, the positioning plate 23, the positioning pins 24 and the positioning holes 25, when the hydraulic oil enters the interior of the connecting ring 14, the positioning plate 23 is also squeezed by the hydraulic oil. Under normal circumstances, it is only necessary for the friction plate 15 to directly contact the inner wall of the annular groove 13. Sometimes, there is a situation where the positioning pins 24 are directly matched with the positioning holes 25. However, the positioning pins 24 and the positioning holes 25 are more for emergency treatment. When the limiting assembly fails and the connecting rod 9 rotates again, the positioning pins 24 will engage with the positioning holes 25, and the connecting rod 9 will be limited again, further improving the stability of the limiting assembly.

[0037] It should be further supplemented that the friction plate 15 is connected to the connecting ring 14 by a piston-type sealing structure.

[0038] When the utility model is used:

[0039] First, the scissor frame 3 is adjusted by the hydraulic cylinder 5 to adjust the height of the cab 2. The greater the extension of the hydraulic cylinder 5, the lower the height of the cab 2, and vice versa.

[0040] Then, when the hydraulic cylinder 5 drives the scissor frame 3 to deform, due to the setting of the connecting strip 10 and the spiral groove, the connecting rod 9 rotates and slides in the connecting tube 8. When the cab 2 reaches the specified height, the electric push rod is started through the external electric control device, the piston rod 18 slides in the oil cylinder 17, and the hydraulic oil enters the connecting ring 14 through the pipeline. At this time, the friction plate 15 moves outward under the push of the hydraulic oil and directly contacts the annular groove 13. The connecting rod 9 stops rotating after being limited.

[0041] Finally, when the load on the cab 2 is heavy, the limit assembly fails, and the hydraulic oil enters the connecting ring 14. The positioning plate 23 is also squeezed by the hydraulic oil. When the connecting rod 9 rotates again, the positioning pin 24 will engage with the positioning hole 25, limiting the connecting rod 9 again.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lifting structure for a driving cab of a rock drilling rig, comprising a supporting platform (1) disposed on the top of the rock drilling rig, a driving cab (2) located above the supporting platform (1), It is characterized in that A lifting assembly is provided between the cab (2) and the supporting platform (1); The lifting assembly comprises a scissor frame (3), wherein the upper and lower ends of one side of the scissor frame (3) are respectively rotatably connected to the cab (2) and the support platform (1), and the upper and lower ends of the other side of the scissor frame (3) are respectively slidably connected to the cab (2) and the support platform (1), and the scissor frame (3) comprises two hinged connecting frames (4), and two symmetrically distributed hydraulic cylinders (5) are arranged on the tops of the two connecting frames (4), and the two ends of the hydraulic cylinders (5) are respectively rotatably connected to the tops of the corresponding connecting frames (4); The two connecting frames (4) are divided into an inner frame (6) and an outer frame (7), and the top of the inner frame (6) and the outer frame (7) are provided with a same limiting assembly, and the limiting assembly comprises a connecting tube (8) rotatably connected to the inner frame (6), a connecting rod (9) is coaxially slidable in the connecting tube (8), a spiral connecting strip (10) is fixed on the outer wall of the connecting rod (9), and a spiral groove matching the connecting strip (10) is provided on the inner wall of the connecting tube (8), and a connecting block (11) is rotatably connected to the top of the outer frame (7), and one end of the connecting rod (9) away from the connecting tube (8) is rotatably connected to the connecting block (11); A connecting plate (12) is coaxially fixed on one side of the connecting rod (9) close to the connecting block (11); an annular groove (13) is coaxially provided on the connecting plate (12); a connecting ring (14) is rotatably connected in the annular groove (13); the connecting ring (14) is a hollow structure; friction plates (15) are slidably connected on both sides of the connecting ring (14); a connecting pipe (16) is arranged on the top of the connecting ring (14); an oil cylinder (17) is fixedly connected to the connecting block (11); a piston rod (18) is arranged in the oil cylinder (17); a hydraulic push rod (19) is arranged on one side of the piston rod (18) penetrating the oil cylinder (17); the hydraulic push rod (19) is externally connected to an electric control device; the oil cylinder (17) and the connecting pipe (16) are connected through a pipeline.

2. A lifting structure for a drilling rig cab according to claim 1, It is characterized in that A connecting plate (20) is coaxially fixed in the middle of the connecting ring (14), and a plurality of notches (21) evenly distributed around the circumference are formed on the connecting plate (20).

3. A lifting structure for a drilling rig cab according to claim 2, It is characterized in that The two friction plates (15) are each provided with a plurality of through holes evenly distributed around the circumference; a positioning groove (22) connected to the plurality of through holes is provided on one side of the friction plate (15) located inside the connecting ring (14); a positioning plate (23) is slidably connected in the positioning groove (22); a plurality of positioning pins (24) matching the through holes are fixedly connected to the positioning plate (23); the positioning plate (23) is connected to the positioning groove (22) via a spring; and a plurality of positioning holes (25) matching the positioning pins (24) are provided on both side walls of the annular groove (13).

4. A lifting structure for a driving cab of a rock drilling rig according to claim 3, It is characterized in that A friction strip is provided on one side of the friction plate (15) close to the inner wall of the annular groove (13).

5. The lifting structure of the driving cab of a rock drilling rig according to claim 4, It is characterized in that The friction plate (15) and the connecting ring (14) are connected by a piston-type sealing structure.

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