A long-term walking structure for supporting wheels of a roadheader

Abstract

The utility model belongs to the technical field of tunnel boring machine equipment, specifically a long-term walking structure for supporting rollers of tunnel boring machine. It includes a traveling frame, front and rear driving wheels are arranged at the front and rear ends of the traveling frame, and track chains are arranged on the front and rear driving wheels; supporting rollers, a plurality of the supporting rollers are arranged from front to back; front sliding shoes, the front sliding shoes are arranged on the left and right sides of the front end of the traveling frame and are located behind the front driving wheel; rear sliding shoes, the rear sliding shoes are arranged on the left and right sides of the rear end of the traveling frame and are located in front of the rear driving wheel; middle sliding shoes, the middle sliding shoes are arranged between a plurality of supporting rollers. The utility model has both rolling friction and sliding friction, and the front, middle and rear sliding shoes support the gravity and impact force of the whole machine, and the supporting rollers roll to reduce the force, thereby extending the service life of the supporting rollers.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel boring machine equipment, in particular to a long-acting walking structure of a supporting wheel of a tunnel boring machine. Background Art

[0002] At present, in the process of operation, the traveling part of the roadheader moves forward to carry out the operation, and after the operation is completed, the machine must be withdrawn to carry out the anchor protection operation of the front part, and the machine moves forward and backward frequently, especially in the tunnels with high Mohs hardness of the rock. The machine body itself is heavy, and the operation is accompanied by vibration and impact, but the traveling part bears the evacuation effect of all external forces. The traditional structure is that 7-9 supporting wheels are installed at the bottom of the traveling frame, supporting the weight of the whole machine, absorbing the impact load caused by cutting, and the track chain is forced to rotate during the transmission process. The supporting wheels will wear out and fail or get stuck, the supporting wheels will wear unevenly, and the rolling friction will become sliding friction. When the tightening torque of the supporting wheels or the bending strength of the main shaft is less than the friction from the track chain, the supporting wheels will become misaligned, causing the walking part to consume a large amount of traction or even paralyzed, eventually causing the tunnel boring machine to shut down due to walking failure. In addition, when the driving wheel teeth are stuck with mixed debris such as stones and coal mud, the track chain will get stuck or even break. Therefore, it is particularly important to design a long-term walking structure for the supporting wheels. Summary of the invention

[0003] In order to solve the above problems, the utility model provides a long-acting walking structure of a supporting wheel of a roadheader.

[0004] The utility model adopts the following technical scheme: a long-term walking structure of a roadheader supporting wheel, comprising:

[0005] A traveling frame, with front and rear drive wheels arranged at the front and rear ends of the traveling frame, and track chains arranged on the front and rear drive wheels;

[0006] Track wheels, a plurality of which are arranged from front to back;

[0007] Front sliding shoes, which are arranged on the left and right sides of the front end of the walking frame and are located behind the front driving wheel;

[0008] Rear sliding shoes, which are arranged on the left and right sides of the rear end of the walking frame and are located in front of the rear driving wheel;

[0009] The middle sliding shoe is arranged between a plurality of supporting wheels.

[0010] In some embodiments, there are seven supporting rollers arranged in sequence from front to back, wherein two supporting rollers are located at the front side of the walking frame, two supporting rollers are located at the rear side of the walking frame, and three supporting rollers are arranged in the middle of the walking frame.

[0011] In some embodiments, the middle sliding shoe is arranged between the two supporting rollers at the front side of the walking frame and the three supporting rollers in the middle of the walking frame.

[0012] In some embodiments, the middle sliding shoe is designed at the center of gravity of the whole machine to support the weight of the whole machine.

[0013] In some embodiments, the contact height between the front sliding shoe and the track chain is 4 mm less than the contact height between the supporting wheel and the track chain.

[0014] In some embodiments, the contact height between the rear sliding shoe and the track chain is 4 mm less than the contact height between the supporting wheel and the track chain.

[0015] In some embodiments, the front sliding shoe and the rear sliding shoe are located at a tangent line of the track chain along the arc below the tensioner wheel assembly.

[0016] In some embodiments, the contact height between the middle sliding shoe and the track chain is 3 mm less than the contact height between the supporting wheel and the track chain.

[0017] In some embodiments, a scraper blade is fastened to the upper rear front portion of the rear driving wheel, and the scraper claws of the scraper blade face toward the driving wheel teeth and are located on both sides of the driving wheel teeth.

[0018] In some embodiments, the supporting wheels and the middle sliding shoes are fastened to the walking frame with hexagonal bolts and corresponding spring washers, and the mounting surface is sunken.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. Relieve the load of the whole machine and impact load on the supporting wheels;

[0021] 2. Rolling friction and sliding friction coexist. The front, middle and rear sliding shoes support the gravity and impact force of the whole machine. The rolling of the supporting wheels reduces the force and prolongs the service life of the supporting wheels.

[0022] 3. The scraper should be used to clean the stones, coal mud and other debris stuck on the drive wheel teeth at any time to prevent the chain from getting stuck;

[0023] 4. Avoid downtime of the roadheader due to supporting wheel failure during normal use, thus improving production efficiency;

[0024] 5. Reduce the number of times the supporting wheels are replaced at the production site, reducing the labor intensity and personal safety of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] In the figure, 1, front sliding shoe; 2, supporting wheel; 3, middle sliding shoe; 4, rear sliding shoe; 5, scraper; 6, driving wheel; 7, crawler chain; 8, walking frame. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] The technical solution adopted by the utility model to solve the technical problem is: comprehensively considering the use conditions of the underground mine boring machine, collecting and summarizing the relevant fault phenomena of the walking part supporting wheel 2 and the crawler chain, and accurately identifying the three main reasons for the eccentric wear, broken shaft, misalignment of the supporting wheel 2 and the jamming of the drive wheel chain (1. The walking space is limited, and the actual load borne by the supporting wheel 2 is greater than its designed load; 2. The supporting wheel 2 is located at the bottom of the boring machine and is directly in contact with rocks, coal slime and water. The floating seal cannot effectively protect it, and oil leakage causes dry grinding jamming; 3. The driving wheel teeth are stuck with mixed debris such as stones and coal slime)

[0029] A high-strength supporting roller 2 and tensioning wheel assembly structure is designed, and a long-term walking structure of the supporting roller 2 composed of front, middle and rear sliding shoes 4 is added. The relationship between the load-bearing and impact loads and the friction force is reasonably matched, and the scraper 5 is used to achieve the normal operation of the traveling part of the tunnel boring machine and extend the service life of the traveling part.

[0030] like Figure 1 As shown, a long-term walking structure of a roadheader supporting wheel 2 includes:

[0031] A traveling frame, front and rear drive wheels 6 are arranged at the front and rear ends of the traveling frame, and track chains are arranged on the front and rear drive wheels 6;

[0032] A plurality of supporting wheels 2 are arranged from front to back;

[0033] Front sliding shoes 1, which are arranged on the left and right sides of the front end of the walking frame and are located behind the front driving wheel 6;

[0034] Rear sliding shoes 4, which are arranged on the left and right sides of the rear end of the walking frame and are located in front of the rear driving wheel 6;

[0035] The middle sliding shoe 3 is arranged between the plurality of supporting wheels 2 .

[0036] There are seven supporting wheels 2 arranged in sequence from front to back, wherein two supporting wheels 2 are located at the front side of the walking frame, two supporting wheels 2 are located at the rear side of the walking frame, and three supporting wheels 2 are arranged in the middle of the walking frame.

[0037] The middle sliding shoe 3 is arranged between the two supporting wheels 2 at the front side of the walking frame and the three supporting wheels 2 in the middle part of the walking frame.

[0038] The middle sliding shoe 3 is designed at the center of gravity of the whole machine to support the weight of the whole machine.

[0039] The contact height between the front sliding shoe 1 and the track chain is 4 mm less than the contact height between the supporting wheel 2 and the track chain. The contact height between the rear sliding shoe 4 and the track chain is 4 mm less than the contact height between the supporting wheel 2 and the track chain. The contact height between the middle sliding shoe 3 and the track chain is 3 mm less than the contact height between the supporting wheel 2 and the track chain.

[0040] The front sliding shoe 1 and the rear sliding shoe 4 are located at the tangent of the arc below the tensioner wheel assembly along the track chain.

[0041] A scraper blade 5 is fastened to the upper rear front of the rear driving wheel 6, and the scraper claws of the scraper blade 5 face the gear teeth of the driving wheel 6 and are located on both sides of the gear teeth of the driving wheel 6 to remove foreign objects on the gear teeth at any time.

[0042] In some embodiments, the supporting roller 2 and the middle sliding shoe 3 are fastened to the traveling frame with 4-M20*105 hexagonal bolts and corresponding spring washers, and the mounting surface is sunken, and the mechanical limit relieves the shearing of the bolts. When the supporting roller 2 and the middle sliding shoe 3 receive rolling friction and sliding friction, the existing friction shearing force is offset by the limit groove on the traveling frame, so that the fastening bolts thereof only play a connecting role, avoiding premature fracture and failure due to shearing force.

[0043] Once the supporting roller 2 of the tunnel boring machine is damaged, the supporting roller 2 cannot rotate and rubs against the crawler chain. The wheel body is worn into a flat surface. The number of supporting rollers is large and the weight of the unit itself is large. At this time, the friction resistance is too large and the traction loss is large, causing difficulty in walking and shutting down. On the other hand, after the crawler chain and the supporting roller 2 form a huge sliding friction, the friction force forms a strong shear force on the fastening bolts of the supporting roller 2. After the fastening bolts break, the supporting roller 2 is out of position, that is, the supporting roller 2 is located in a mess under the walking frame, and the crawler chain cannot be transmitted normally, causing it to be unable to walk and shut down.

[0044] The supporting wheel 2 is located at the bottom of the traveling part of the tunnel boring machine. The installation space is about 500mm above the ground. One supporting wheel 2 weighs 250-300 kilograms, and workers need to hold it by hand and align it with the mounting hole on the traveling frame for assembly. In addition, if the fastening bolts are cut off, part of the screw will remain in the original threaded hole. It is unimaginably difficult for ordinary people to remove the broken wire in such a small space. If workers are not careful, they will be hit, knocked, bumped, or squeezed. Failures such as this often occur. Therefore, replacing the supporting wheel 2 is the last thing that on-site workers are willing to do.

[0045] The radial pressure on the supporting wheel 2 is relieved, and the wheel body rotates under the action of radial pressure, which is equivalent to the rotation of the rotating body under an offset load. The rotating body will be damaged prematurely due to failure of the internal bearing or seal. The utility model is summarized through actual use scenarios and root cause analysis of faults in mines. There is no design of front, middle and rear sliding shoes 4 in the prior art. After theoretical demonstration and field tests, the design of front, middle and rear sliding shoes 4 can completely change the abnormal force on the supporting wheel 2.

[0046] Specific slipper layout, the front and rear end slippers are located at the tangent of the arc below the track chain along the tensioning wheel group, ensuring that the track chain is transmitted along the predetermined trajectory, and the middle slipper 3 is designed at the center of gravity of the whole machine to support the weight of the whole machine; in order to make the slippers and the supporting rollers 2 perform their respective functions, the size matching needs to be strictly calculated, the approach angle and the departure angle are naturally formed, and are not restricted by the front and rear slippers. The supporting roller 2 is in full contact with the track chain and is in the lower plane of the walking part as a whole. The wheel diameter of the supporting roller 2 is 33mm higher than the middle slipper and 4mm higher than the lowest point of the front and rear following slippers. After calculation, distribution and working condition simulation, the supporting roller 2 is not an absolute plane because the tunnel floor is not an absolute plane. The middle slipper 3 supports the center of gravity of the whole machine. The remaining supporting rollers 2 roll with the friction of the track chain and do not rotate under the load of the weight of the whole machine, thereby extending the service life of the rotating body of the supporting roller 2.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A long-term walking structure of a roadheader supporting wheel, characterized in that: include: A traveling frame, wherein front and rear driving wheels (6) are arranged at the front and rear ends of the traveling frame, and crawler chains are arranged on the front and rear driving wheels (6); Track wheels, a plurality of which are arranged from front to back; Front sliding shoes, which are arranged on the left and right sides of the front end of the walking frame and are located behind the front driving wheel (6); Rear sliding shoes, which are arranged on the left and right sides of the rear end of the walking frame and are located in front of the rear driving wheel (6); The middle sliding shoe is arranged between a plurality of supporting wheels.

2. The long-term traveling structure of the roadheader supporting wheel according to claim 1 is characterized in that: There are 7 supporting wheels arranged in sequence from front to back, wherein two supporting wheels are located at the front side of the walking frame, two supporting wheels are located at the rear side of the walking frame, and three supporting wheels are arranged in the middle of the walking frame.

3. The long-term traveling structure of the roadheader supporting wheel according to claim 2 is characterized in that: The middle sliding shoe is arranged between the two supporting rollers at the front side of the walking frame and the three supporting rollers in the middle part of the walking frame.

4. The long-term traveling structure of the roadheader supporting wheel according to claim 3 is characterized in that: The middle sliding shoe is designed at the center of gravity of the whole machine to support the weight of the whole machine.

5. The long-term traveling structure of the roadheader supporting wheel according to claim 1 is characterized in that: The contact height between the front sliding shoe and the track chain is 4 mm less than the contact height between the supporting wheel and the track chain.

6. The long-term traveling structure of the roadheader supporting wheel according to claim 1 is characterized in that: The contact height between the rear sliding shoe and the track chain is 4 mm less than the contact height between the supporting wheel and the track chain.

7. The long-term traveling structure of the roadheader supporting wheel according to claim 1 is characterized in that: The front sliding shoe and the rear sliding shoe are located at the tangent of the arc below the tensioning wheel set along the track chain.

8. The long-term traveling structure of the roadheader supporting wheel according to claim 1 is characterized in that: The contact height between the middle sliding shoe and the track chain is 3 mm less than the contact height between the supporting wheel and the track chain.

9. The long-term traveling structure of the roadheader supporting wheel according to claim 1, characterized in that: A scraper is fastened to the upper rear front of the rear driving wheel (6), and the scraper claws of the scraper face toward the teeth of the driving wheel (6) and are located on both sides of the teeth of the driving wheel (6).

10. The long-term traveling structure of the roadheader supporting wheel according to claim 1, characterized in that: The supporting wheels and the middle sliding shoes are fastened to the walking frame by using external hexagonal bolts and corresponding spring washers, and the mounting surface is sunken.

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