A method for installing counterweights in a bucket wheel stacker-reclaimer

Abstract

This invention provides a method for installing counterweights on a bucket wheel stacker-reclaimer, comprising the following steps: placing the outer end of the cantilever on a front support; filling the rod-side and rodless-side chambers of the pitch cylinder with hydraulic oil, locking the safety valve of the pitch cylinder, and connecting the rod-side and rodless-side chambers to a first pressure gauge and a second pressure gauge, respectively; applying counterweight to the outer end of the counterweight arm; when the pressure value of the first pressure gauge rises to a certain value, opening the safety valve of the pitch cylinder to release the pressure in the rod-side chamber; gradually pulling the tie rod between the cantilever and the cantilever frame until it is fully straightened, providing power to the rodless-side chamber to lift the cantilever to a state separated from the front support; locking the safety valve of the pitch cylinder, continuing to add counterweight, calculating the amount of counterweight required by the decrease in the pressure value of the second pressure gauge after each 1t increase in counterweight, and then reinstalling. This invention eliminates the need for complex simulation calculation formulas, allowing for convenient and accurate counterweight installation on actual bucket wheel stacker-reclaimers based on site conditions.

Description

Technical Field

[0001] This invention relates to an installation technology for a bucket wheel stacker-reclaimer, and more particularly to a method for installing the counterweight of a bucket wheel stacker-reclaimer. Background Technology

[0002] The existing counterweight installation for bucket wheel stacker-reclaimers requires the cooperation of a 25t truck crane and a 75t truck crane. The 25t truck crane is responsible for weighing the cantilever of the stacker-reclaimer, while the 75t truck crane is responsible for installing the counterweight blocks one by one onto the counterweight arm. As the counterweight is added, the 25t truck crane gradually reduces its load until the appropriate residual weight is achieved. The counterweight installation is then complete. However, this process suffers from high costs, site limitations, low weighing accuracy of the cranes themselves, frequent instances of unsuitable counterweight weight requiring secondary adjustments, and high skill requirements for crane operators due to the need for dual-crane operation. Summary of the Invention

[0003] To address the above issues, a method for installing counterweights in a bucket wheel stacker-reclaimer is proposed.

[0004] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: A bucket wheel stacker-reclaimer includes a cantilever frame, a cantilever, a counterweight arm, a pitch cylinder, a tie rod between the cantilever and the cantilever frame, a tie rod between the counterweight arm and the cantilever frame, a slewing platform, and a bucket wheel mechanism; including the following steps:

[0005] (1) Place the outer end of the cantilever on the front support, and the tie rod between the cantilever and the cantilever frame is bent;

[0006] (2) Start the hydraulic system of the pitch cylinder, fill the rod chamber and rodless chamber of the pitch cylinder with hydraulic oil, lock the safety valve on the pitch cylinder, keep the rod chamber and rodless chamber of the pitch cylinder locked, connect the first pressure gauge to the rod chamber of the pitch cylinder, and then connect the second pressure gauge to the rodless chamber of the pitch cylinder.

[0007] (3) Add a counterweight to the outer end of the counterweight arm. Observe the change of the first pressure gauge once for each additional counterweight. As the counterweight increases, the pitch cylinder begins to be stressed and the pressure value of the first pressure gauge increases.

[0008] (4) When the pressure value of the first pressure gauge rises to 10%-80% of the rated operating pressure of the pitch cylinder, the pressure in the rod chamber is released by manually operating the hydraulic system to open the safety valve of the pitch cylinder.

[0009] (5) The high pressure release causes the rod chamber to elongate, and the cantilever moves slowly clockwise with the connecting shaft of the slewing platform as the fulcrum, and the tie rod between the cantilever and the cantilever gradually straightens;

[0010] (6) When the tie rod between the cantilever and the cantilever frame is fully straightened, the weight of the cantilever is greater than the weight of the counterweight, and the outer end of the cantilever has not left the front support.

[0011] (7) The hydraulic system provides power to the rodless chamber of the pitch cylinder, the rod chamber continues to extend, and the cantilever continues to move slowly clockwise around the connecting shaft as the fulcrum, so that the cantilever is raised to the state of separation from the front support, and the front support is removed.

[0012] (8) Lock the safety valve on the pitch cylinder. At this time, the value of the second pressure gauge is the pressure value applied to the pitch cylinder by the cantilever.

[0013] (9) Continue to increase the counterweight. Convert the counterweight by using a 1t fixed counterweight. After adding 1t of counterweight, observe and record the decrease in the pressure value of the second pressure gauge.

[0014] (10) Calculate the amount of counterweight required by the decrease in pressure value of the second pressure gauge after each 1t increase in counterweight, and then install it. Installation is complete.

[0015] Furthermore, one end of the pitch cylinder is hinged to the slewing platform, and the other end is hinged to the cantilever frame; the inner end of the cantilever is hinged to the cantilever frame, and the outer end of the cantilever is hinged to the top of the cantilever frame via a tie rod, and the outer end of the cantilever is fixedly connected to the bucket wheel mechanism; the inner end of the counterweight arm is hinged to the cantilever frame, and the outer end of the counterweight arm is hinged to the top of the cantilever frame via a tie rod.

[0016] Furthermore, in step (7), the cantilever is raised to a distance of 100-300mm from the front support.

[0017] The beneficial effects of this invention are: This invention provides a method for adjusting and calculating the counterweight installation through the hydraulic system of a bucket wheel stacker-reclaimer. It does not require complex simulation calculation formulas and solves the calculation error problem caused by too many hinge angles of the bucket wheel stacker-reclaimer and the complexity of actual on-site problems. This invention can install counterweights on the actual bucket wheel stacker-reclaimer according to the actual on-site conditions to prevent overturning, which is convenient and accurate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the present invention without added counterweight;

[0019] Figure 2 This is a schematic diagram for step (6);

[0020] Figure 3 This is a schematic diagram of step (7);

[0021] Figure 4 This is a magnified view of the position of the pitch cylinder of the bucket wheel stacker-reclaimer.

[0022] In the diagram: 1. Cantilever frame, 2. Cantilever, 3. Counterweight arm, 4. Pitch cylinder, 4-1. Rod chamber, 4-2. Rodless chamber, 5. Tie rod between cantilever and cantilever frame, 6. Tie rod between counterweight arm and cantilever frame, 7. Slewing platform, 7-1. Connecting shaft on slewing platform, 8. Bucket wheel mechanism, 9. Front support. Detailed Implementation

[0023] To make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0024] See appendix Figure 1-3 A method for installing a counterweight in a bucket wheel stacker-reclaimer, the bucket wheel stacker-reclaimer comprising a cantilever frame 1, a cantilever 2, a counterweight arm 3, a pitch cylinder 4, a tie rod 5 between the cantilever and the cantilever frame, a tie rod 6 between the counterweight arm and the cantilever frame, a slewing platform 7, and a bucket wheel mechanism 8; comprising the following steps:

[0025] (1) Place the outer end of the cantilever 2 on the front support 9, and the tie rod 5 between the cantilever and the cantilever frame is bent; the front support 9 is a tooling support that is placed before the new bucket wheel machine is assembled, and is not placed during the later counterweight adjustment. The front support 9 is placed on the ground, the outer end of the cantilever 2 is placed on the front support 9, and the bucket wheel mechanism 8 is placed on the outer end of the cantilever 2. The cantilever 2 and the bucket wheel mechanism 8 are balanced on the front support 9.

[0026] (2) Start the hydraulic system of the pitch cylinder 4, fill the rod chamber 4-1 and rodless chamber 4-2 of the pitch cylinder 4 with hydraulic oil, lock the safety valve on the pitch cylinder 4, keep the rod chamber 4-1 and rodless chamber 4-2 of the pitch cylinder locked, connect the first pressure gauge to the rod chamber 4-1 of the pitch cylinder 4, and then connect the second pressure gauge to the rodless chamber 4-2 of the pitch cylinder 4.

[0027] (3) Add counterweights to the outer end of counterweight arm 3. Observe the change of the first pressure gauge once for each additional counterweight. As the counterweight increases, the pitch cylinder 4 begins to bear force, and the pressure value of the first pressure gauge increases. The counterweights of the bucket wheel stacker-reclaimer are all fixed-value counterweights, with large pieces weighing 15t and small pieces weighing 1t.

[0028] (4) When the pressure value of the first pressure gauge rises to 10%-80% of the rated operating pressure of the pitch cylinder 4, the safety valve of the pitch cylinder 4 is opened by manually operating the hydraulic system to release the pressure of the rod chamber 4-1; when the pressure of the pitch cylinder 4 is released to the natural state, the counterweight is added to the outer end of the counterweight arm 3, and only the piston rod is subjected to tension, while the rodless chamber is not subjected to force.

[0029] (5) The high pressure release causes the rod chamber 4-1 to elongate, and the cantilever 1 moves slowly clockwise with the connecting shaft 7-1 on the rotary platform as the fulcrum, and the tie rod 5 between the cantilever and the cantilever frame gradually straightens.

[0030] (6) When the tie rod 5 between the cantilever and the cantilever frame is fully straightened, the weight of the cantilever 2 is greater than the weight of the counterweight, and the outer end of the cantilever 2 has not left the front support 9. After being fully straightened, the front cantilever begins to bear force. The cantilever can be lifted by adding counterweight to the outer end of the counterweight arm 3. After being straightened, the cantilever may not be able to be lifted by directly using the pitch cylinder 4 due to insufficient power.

[0031] (7) The hydraulic system provides power to the rodless chamber 4-2 of the pitch cylinder, the rod chamber 4-1 continues to extend, the cantilever 1 continues to move slowly clockwise with the connecting shaft as the fulcrum, so that the cantilever 2 is lifted to the state of separation from the front support 9, and the front support 9 is removed.

[0032] (8) Lock the safety valve on the pitch cylinder 4. At this time, the value of the second pressure gauge is the pressure value applied to the pitch cylinder 4 by the cantilever 2.

[0033] (9) Continue to increase the counterweight. Convert the counterweight by using a 1t fixed counterweight. After adding 1t of counterweight, observe and record the decrease in the pressure value of the second pressure gauge.

[0034] (10) Calculate the amount of counterweight required by the decrease in pressure value of the second pressure gauge after each 1t increase in counterweight, and then install it. Installation is complete.

[0035] Furthermore, one end of the pitch cylinder 4 is hinged to the slewing platform 7, and the other end is hinged to the cantilever 1; the inner end of the cantilever 2 is hinged to the cantilever 1, and the outer end of the cantilever 2 is hinged to the top of the cantilever 1 via a tie rod, and the outer end of the cantilever 2 is fixedly connected to the bucket wheel mechanism 8; the inner end of the counterweight arm 3 is hinged to the cantilever 1, and the outer end of the counterweight arm 3 is hinged to the top of the cantilever 1 via a tie rod.

[0036] Furthermore, in step (7), the pitch cylinder 4 is locked and pressure-maintained by the hydraulic control check valve integrated on the rodless cavity 4-2; by means of visible gap separation, the cantilever 2 is raised to a state where it is separated from the front support 9 by 100-300mm by manual operation.

[0037] Furthermore, in the state of step (8), the system is balanced and the length of the rod cavity 4-1 is fixed.

[0038] Furthermore, after the counterweight is installed in step (10), the verification can be performed by measuring the pressure change value of the second pressure gauge.

[0039] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A method for installing a counterweight of a bucket wheel stacker-reclaimer, the bucket wheel stacker-reclaimer comprising a slewing platform, a cantilever frame, a cantilever, a counterweight arm, a luffing cylinder, a bucket wheel mechanism, a pull rod between the cantilever and the cantilever frame, a pull rod between the counterweight arm and the cantilever frame; characterized in that, Includes the following steps: (1) Place the outer end of the cantilever on the front support, and the tie rod between the cantilever and the cantilever frame is bent; (2) Start the hydraulic system of the pitch cylinder, fill the rod chamber and rodless chamber of the pitch cylinder with hydraulic oil, lock the safety valve on the pitch cylinder, keep the rod chamber and rodless chamber of the pitch cylinder locked, connect the first pressure gauge to the rod chamber of the pitch cylinder, and then connect the second pressure gauge to the rodless chamber of the pitch cylinder. (3) Add a counterweight to the outer end of the counterweight arm. Observe the change of the first pressure gauge once for each additional counterweight. As the counterweight increases, the pitch cylinder begins to be stressed and the pressure value of the first pressure gauge increases. (4) When the pressure value of the first pressure gauge rises to 10%-80% of the rated operating pressure of the pitch cylinder, the pressure in the rod chamber is released by manually operating the hydraulic system to open the safety valve of the pitch cylinder. (5) The high pressure release causes the rod chamber to elongate, and the cantilever moves slowly clockwise with the connecting shaft of the slewing platform as the fulcrum, and the tie rod between the cantilever and the cantilever gradually straightens; (6) When the tie rod between the cantilever and the cantilever frame is fully straightened, the weight of the cantilever is greater than the weight of the counterweight, and the outer end of the cantilever has not left the front support. (7) The hydraulic system provides power to the rodless chamber of the pitch cylinder, the rod chamber continues to extend, and the cantilever continues to move slowly clockwise around the connecting shaft as the fulcrum, so that the cantilever is raised to the state of separation from the front support, and the front support is removed. (8) Lock the safety valve on the pitch cylinder. At this time, the value of the second pressure gauge is the pressure value applied to the pitch cylinder by the cantilever. (9) Continue to increase the counterweight. Convert the counterweight by using a 1t fixed counterweight. After adding 1t of counterweight, observe and record the decrease in the pressure value of the second pressure gauge. (10) Calculate the amount of counterweight required by the decrease in pressure value of the second pressure gauge after each 1t increase in counterweight, and then install it. Installation is complete.

2. The method for installing counterweights in a bucket wheel stacker-reclaimer according to claim 1, characterized in that, One end of the pitch cylinder is hinged to the slewing platform, and the other end is hinged to the cantilever frame; the inner end of the cantilever is hinged to the cantilever frame, and the outer end of the cantilever is hinged to the top of the cantilever frame via a tie rod, and the outer end of the cantilever is fixedly connected to the bucket wheel mechanism; the inner end of the counterweight arm is hinged to the cantilever frame, and the outer end of the counterweight arm is hinged to the top of the cantilever frame via a tie rod.

3. The method for installing counterweights in a bucket wheel stacker-reclaimer according to claim 1, characterized in that, In step (7), the cantilever is raised to 100-300mm away from the front support.

Images