Calcining furnace lifting device and use method thereof

Abstract

The present invention provides a calcining furnace lifting device, which consists of a saddle, a safety support, a washer group and a hydraulic system. The hydraulic pump of the hydraulic system is arranged on an oil return pipe, and a pressure gauge is also arranged on the oil return pipe. A one-way throttle valve is arranged on the working oil circuit that is manually switched to the oil inlet of a double-acting jack, and the one-way throttle valve is a combined hydraulic component of a one-way valve and a throttle valve. The present invention also provides an operation method for replacing a supporting wheel using the above-mentioned calcining furnace lifting device, and controls the synchronization of the two hydraulic systems according to the pressure gauge, so that the hydraulic system lifts the roller ring, and then replaces the supporting wheel, and then slowly retracts the double-acting jack according to the display of the pressure gauge to put the roller ring back. The present invention successfully solves the problem that the single-acting jack that has troubled the calcining furnace for many years is very easy to be damaged and inconvenient to disassemble, and greatly improves the safety of the calcining furnace lifting operation.

Description

Technical Field

[0001] The invention belongs to the technical field of lifting equipment, and in particular relates to a calcining furnace lifting device and a calcining furnace supporting wheel replacement and lifting operation method. Background Art

[0002] Steam-heated calcining furnace is a key equipment in chemical production. During long-term continuous operation, the supporting rollers that support the operation of the furnace body need to be replaced after the outer cylindrical surface and bearings are worn due to the large axial and radial loads. In order to replace the supporting rollers, the furnace body with a total weight of more than 400 tons needs to be lifted up to separate the rollers from the supporting rollers by a certain distance, so that the supporting rollers can be replaced. Replacing the supporting rollers requires at least one shift, during which the furnace body must be kept in the correct and safe position. The traditional method of furnace lifting operation uses two single-acting integrated jacks. Because the load of each jack cannot be reasonably distributed and measured, the jacks are often damaged, threatening the safe operation of the furnace lifting. Because the plunger of the single-acting jack needs external force to retract, when the jack is disassembled, a crowbar needs to be used to retract the plunger, which is time-consuming, labor-intensive and unsafe. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the output of the furnace body lifting system in the prior art cannot be reasonably distributed, the load of each jack cannot be quantified, and the engineering safety is endangered.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A method for replacing a supporting wheel by using a calcining furnace lifting device, characterized in that: the calcining furnace lifting device is composed of a saddle, a safety support, a washer group and a hydraulic lifting system, the saddle is arranged on the lower side of the furnace body, safety supports are arranged on both sides of the saddle, a lifting mechanism is arranged between the two safety supports, and the lifting mechanism is a pair of hydraulic lifting systems, the hydraulic lifting system includes an oil tank, an oil inlet pipe, an oil return pipe, a manual reversing valve, a hydraulic pump and a double-acting jack, the oil inlet pipe connects the oil tank and the oil inlet of the manual reversing valve; the oil return pipe connects the oil tank and the oil return port of the manual reversing valve; the two working oil circuits of the manual reversing valve are respectively connected to the oil inlet and the oil outlet of the double-acting jack; the hydraulic pump is arranged on the oil return pipe, and a pressure gauge is also arranged on the oil return pipe; a one-way throttle valve is arranged on the working oil circuit from the manual reversing valve to the oil inlet of the double-acting jack, and the one-way throttle valve is a combined hydraulic element of a one-way valve and a throttle valve;

[0006] The replacement process is carried out in the following steps:

[0007] 1) Remove one side of the blocking wheel and clean the location where the calcining furnace lifting device is installed;

[0008] 2) Install the saddle under the roller ring, and use a hand chain hoist to lift the saddle so that it fits the roller ring;

[0009] 3) Two double-acting jacks are arranged under the saddle. The two double-acting jacks are arranged symmetrically relative to the axis of the furnace body. Two safety supports are arranged on the outside of the two double-acting jacks respectively, and a shim group is placed between the top of the safety support and the saddle;

[0010] 4) Reliably connect all components in the hydraulic jacking system, place the manual reversing valve in the rising position, and close the one-way throttle valve switch;

[0011] 5) Drive two hydraulic pumps at the same time, slowly lift the double-acting jack to support the saddle, lift the roller ring through the saddle, and lift the furnace body with the supporting wheel group at the other end as the fulcrum. During the lifting process, the operators of the double-acting jack cooperate with each other, check the pressure gauge value in real time, and control the pressure gauge value difference to be less than or equal to 10MPa while the saddle is lifted horizontally;

[0012] 6) During the lifting process, the height of the shim group is constantly adjusted to keep it in close contact with the saddle. After the roller is lifted to about 15 mm away from the supporting wheel, lift it into place and compact the shim group on the safety support to ensure sufficient contact area and reliability;

[0013] 7) Place the manual reversing valve in the descending position, slowly loosen the one-way throttle valve, and make the double-acting jack drop slightly. Control the pressure indication value to be less than 5MPa. At this time, most of the weight of the furnace body is borne by the safety support, and close the one-way throttle valve;

[0014] 8) After this operation is completed, the support roller can be replaced; after the support roller is replaced, the furnace body can be reset.

[0015] Compared with the prior art, the above solution successfully solves the problem of single-acting jacks being easily damaged and inconvenient to disassemble that has troubled the company for many years, and greatly improves the safety of the calcining furnace lifting operation.

[0016] Specifically, the furnace body resetting operation is as follows: put the manual reversing valve in the rising position, and control the two driving hydraulic pumps of the double-acting jack at the same time, so that the double-acting jack slightly lifts the saddle, then remove the shim group, put the manual reversing valve in the descending position, and two people slowly loosen the one-way throttle valve at the same time to slowly lower the double-acting jack. During the descent, check the pressure indication value in real time until the saddle level slowly drops and the roller smoothly drops onto the supporting wheel, drive the hydraulic pump to fully retract the double-acting jack piston rod, take out the double-acting jack and saddle to complete all operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the jacking device of the present invention;

[0018] Figure 2 The schematic diagram of the hydraulic system of the invention;

[0019] Figure 3 This is the overall structural diagram of the jacking device.

[0020] In the figure: furnace body 1, roller 2, saddle 3, shim group 4, hydraulic jacking system 5, safety support 6, supporting wheel 7, double-acting jack 5-1, one-way throttle valve 5-2, manual reversing valve 5-3, hydraulic pump 5-4, pressure gauge 5-5. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1 , Figure 2 This embodiment is a calcining furnace lifting device, which consists of a saddle 3, a safety support 6, a pad iron group 4 and a hydraulic lifting system 5. The saddle 3 is arranged on the lower side of the furnace body 1, and safety supports 6 are arranged on both sides of the saddle 3. A lifting mechanism is arranged between the two safety supports 6. The lifting mechanism is a pair of hydraulic lifting systems. The hydraulic lifting system 5 includes an oil tank, an oil inlet pipe, an oil return pipe, a manual reversing valve 5-3, a hydraulic pump 5-4 and a double-acting jack 5-1. The oil inlet pipe connects the oil tank and the oil inlet of the manual reversing valve 5-3; the oil return pipe connects the oil tank and the oil return port of the manual reversing valve 5-3; the two working oil circuits of the manual reversing valve 5-3 are respectively connected to the oil inlet of the double-acting jack 5-1 and the oil outlet of the double-acting jack 5-1; the hydraulic pump 5-4 is arranged on the oil return pipe, and a pressure gauge 5-5 is also arranged on the oil return pipe; a one-way throttle valve 5-2 is arranged on the working oil circuit from the manual reversing valve 5-3 to the oil inlet of the double-acting jack 5-1, and the one-way throttle valve is a combined hydraulic component of a one-way valve and a throttle valve.

[0023] In the above device, the two working oil circuits between the manual reversing valve 5-3 and the double-acting jack 5-1 use high-pressure oil pipes. The hydraulic pump 5-4 of the present invention is a manual hydraulic pump, which is adjusted and controlled by the staff at any time according to the status of each component.

[0024] The one-way valve in the one-way throttle valve 5-2 ensures that the lower joint of the double-acting jack 5-1 can only take in oil but not out oil during the lifting process (the throttle valve needs to be closed at this time), preventing accidental leakage of the high-pressure oil pipe from causing the double-acting jack 5-1 to suddenly fall and cause an accident. The throttle valve in the one-way throttle valve 5-2 ensures that the double-acting jack 5-1 is opened slowly when it needs to fall, so that the hydraulic oil in the lower chamber of the double-acting jack 5-1 slowly flows to the oil tank, and the descent speed of the double-acting jack 5-1 is controlled by adjusting the opening of the throttle valve.

[0025] The calcining furnace lifting device adopts a double-acting jack 5-1 to realize the lifting of the calcining furnace. The lifting output is determined by a pressure gauge 5-5 to determine the load of each jack, which effectively helps the staff to reasonably distribute the lifting output and ensure the smooth lifting of the furnace body.

[0026] The saddle 3 is lifted by the hand chain hoist and contacts the roller 2. The manual hydraulic pump drives the double-acting jack 5-1, which lifts the saddle 3 and transmits the lifting force to the roller 2, and then lifts the furnace body 1. The safety support 6 is arranged on both sides of the double-acting jack 5-1, and the shim group 4 is placed on the safety support 6 and contacts the saddle 3, and supports the weight of the furnace body 1 after the furnace body 1 is lifted into place.

[0027] Taking the furnace tail end top furnace operation as an example, the operation method of using the above-mentioned calcining furnace top lifting device to replace the support wheel is carried out according to the following steps:

[0028] 1) Remove the retaining wheel on one side and clean the location where the calcining furnace lifting device is installed.

[0029] 2) Install the saddle 3 under the roller ring 2, and use a hand winch to lift the saddle 3 so that it fits the roller ring 2.

[0030] 3) Two double-acting jacks 5 - 1 are arranged below the saddle 3 , and the two double-acting jacks 5 - 1 are arranged symmetrically with respect to the axis of the furnace body 1 . Two safety supports 6 are arranged on the outer sides of the two double-acting jacks 5 - 1 , respectively, and a shim group 4 is placed between the top of the safety support 6 and the saddle 3 .

[0031] 4) Reliably connect the components in the hydraulic jacking system 5, place the manual reversing valve 5-3 in the rising position, and close the switch of the one-way throttle valve 5-2.

[0032] 5) Simultaneously drive the hydraulic pump 5-4, slowly lift the double-acting jack 5-1 to support the saddle 3, lift the roller 2 through the saddle 3, and lift the furnace body 1 with the other end of the supporting wheel group as the fulcrum. During the lifting process, the operators of the double-acting jack 5-1 cooperate with each other and check the value of the pressure gauge 5-5 in real time to ensure that the difference between the values ​​of the pressure gauge 5-5 is no more than 10MPa while the saddle 3 is lifted horizontally. If this value is exceeded, find the cause and quickly explain the problem and maintain this requirement.

[0033] 6) During the lifting process, continuously adjust the height of the shim group 4 to keep it in close contact with the saddle 3. Lift until the roller 2 is about 15 mm away from the supporting wheel 7 and then lift it into place. Firmly tamp the shim group 4 on the safety support 6 to ensure sufficient contact area and reliability.

[0034] 7) Place the manual reversing valve 5-3 in the descending position, slowly loosen the one-way throttle valve 5-2, and make the double-acting jack 5-1 descend slightly, so that the pressure gauge 5-5 indicates less than 5MPa. At this time, most of the weight of the furnace body 1 is borne by the safety support 6, and the one-way throttle valve 5-2 is closed.

[0035] 8) After this operation is completed, the operation of replacing the supporting wheel 7 can be carried out; after the operation of replacing the supporting wheel 7 is completed, the furnace body can be reset. Specifically: put the manual reversing valve 5-3 in the rising position, and control the two hydraulic pumps 5-4 driving the double-acting jack 5-1 at the same time, so that the double-acting jack 5-1 slightly lifts the saddle 3, and then remove the shim group 4. Put the manual reversing valve 1 in the descending position, and two people slowly loosen the one-way throttle valve 5-2 at the same time to make the double-acting jack 5-1 slowly descend. During the descent process, check the indication of the pressure gauge 5-5 in real time until the saddle 3 slowly descends horizontally so that the roller 2 falls smoothly onto the supporting wheel 7. Drive the hydraulic pump 5-4 to fully retract the piston rod of the double-acting jack 5-1, take out the double-acting jack 5-1 and the saddle 3 to complete all operations.

[0036] The present invention adopts a large-tonnage high-quality double-acting jack to ensure the reliability, efficiency and safety of the operation. The pressure gauge 5-5 can display the actual load of the double-acting jack 5-1 in the lifting process in real time, which can prevent a certain double-acting jack 5-1 from being damaged due to excessive load and the center of gravity of the furnace body 1 from shifting during the lifting process. It can also display the actual weight of the section of the furnace body 1 to assist in judging the amount of alkali in the furnace. From the time when the roller 2 leaves the supporting wheel 7 to the time when the furnace body 1 is lifted into place, it can be judged whether there is an additional load influence by the change in the total displayed value. The one-way throttle valve 5-2 ensures that the lower joint of the double-acting jack 5-1 can only take in oil but not out oil during the lifting process, preventing accidental leakage of the high-pressure oil pipe from causing the double-acting jack 5-1 to suddenly fall and cause an accident. The use of a hydraulic pump 5-4 can make the lifting and lowering movements slow and easy to control. The use of two hydraulic pumps 5-4 to drive two double-acting jacks 5-1 respectively can independently regulate any one of them. The height of the shim group 4 is easy to adjust and is in close contact with the saddle 3. When the double-acting jack 5-1 fails unexpectedly, the weight of the furnace body 1 is borne by the shim group 4 and the safety support 6 to prevent accidents. The combination of the safety support 6 and the shim group 4 mainly bears the weight of the furnace body 1 during the replacement of the supporting wheel 7, preventing the double-acting jack 5-1 from being damaged prematurely due to long-term heavy load.

Claims

1. A method for replacing a supporting wheel using a calcining furnace lifting device, characterized in that: The calcining furnace lifting device is composed of a saddle (3), a safety support (6), a pad iron group (4) and a hydraulic lifting system (5). The saddle (3) is arranged on the lower side of the furnace body (1). Safety supports (6) are arranged on both sides of the saddle (3). A lifting mechanism is arranged between the two safety supports (6). The lifting mechanism is a pair of hydraulic lifting systems (5). The hydraulic lifting system (5) includes an oil tank, an oil inlet pipe, an oil return pipe, a manual reversing valve (5-3), a hydraulic pump (5-4) and a double-acting jack (5-1). The oil inlet pipe connects the oil tank and the oil inlet of the manual reversing valve (5-3). an oil return pipe connecting the oil tank and the oil return port of the manual reversing valve (5-3); two working oil circuits of the manual reversing valve (5-3) are respectively connected to the oil inlet of the double-acting jack (5-1) and the oil outlet of the double-acting jack (5-1); the hydraulic pump (5-4) is arranged on the oil return pipe, and a pressure gauge (5-5) is also arranged on the oil return pipe; a one-way throttle valve (5-2) is arranged on the working oil circuit from the manual reversing valve (5-3) to the oil inlet of the double-acting jack (5-1), and the one-way throttle valve (5-2) is a combined hydraulic component of a one-way valve and a throttle valve; The replacement process is carried out in the following steps: 1) Remove one side of the blocking wheel and clean the location where the calcining furnace lifting device is installed; 2) Install the saddle (3) under the roller (2), and use a hand chain hoist to lift the saddle (3) so that it fits the roller (2); 3) two double-acting jacks (5-1) are arranged below the saddle (3), the two double-acting jacks (5-1) are arranged symmetrically with respect to the axis of the furnace body (1), two safety supports (6) are arranged outside the two double-acting jacks (5-1), and a shim group (4) is placed between the top of the safety support (6) and the saddle (3); 4) Reliably connect the components of the hydraulic lifting system (5), place the manual reversing valve (5-3) in the ascending position, and close the switch of the one-way throttle valve (5-2); 5) Simultaneously drive two hydraulic pumps (5-4), slowly lift the double-acting jack (5-1) to support the saddle (3), lift the roller (2) through the saddle (3), and lift the furnace body (1) with the other end support wheel (7) as the fulcrum. During the lifting process, the operators of the double-acting jack (5-1) cooperate with each other, check the value of the pressure gauge (5-5) in real time, and control the value difference of the pressure gauge (5-5) to be less than or equal to 10MPa while the saddle (3) is lifted horizontally; 6) During the lifting process, the height of the shim group (4) is continuously adjusted to ensure that it is in close contact with the saddle (3). After the roller (2) is lifted to a distance of about 15 mm from the supporting wheel (7), the shim group (4) on the safety support (6) is firmly pressed to ensure sufficient contact area and reliability. 7) Place the manual reversing valve (5-3) in the descending position, slowly loosen the one-way throttle valve (5-2), and make the double-acting jack (5-1) descend slightly. Control the pressure gauge (5-5) to display a value less than 5MPa. At this time, most of the weight of the furnace body (1) is borne by the safety support (6). Close the one-way throttle valve (5-2); 8) After this operation is completed, the support wheel (7) can be replaced; after the support wheel (7) is replaced, the furnace body (1) is reset.

2. The method for replacing a supporting wheel (7) according to claim 1, characterized in that: The specific operation of resetting the furnace body (1) is as follows: placing the manual reversing valve (5-3) in the ascending position, and controlling the two driving hydraulic pumps (5-4) of the double-acting jack (5-1) at the same time, so that the double-acting jack (5-1) slightly lifts the saddle (3), then removing the shim group (4), placing the manual reversing valve (5-3) in the descending position, and two persons simultaneously slowly loosen the one-way throttle valve (5-2) to slowly lower the double-acting jack (5-1), and during the lowering process, checking the displayed value of the pressure gauge (5-5) in real time until the saddle (3) slowly lowers horizontally so that the roller (2) smoothly drops onto the supporting wheel (7), driving the hydraulic pump (5-4) to completely retract the piston rod of the double-acting jack (5-1), taking out the double-acting jack (5-1) and the saddle (3), and completing all operations.

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