CN210318449U - Lubricating device for gear column of horizontal rotary large gear ring - Google Patents
Lubricating device for gear column of horizontal rotary large gear ring Download PDFInfo
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- CN210318449U CN210318449U CN201921044819.2U CN201921044819U CN210318449U CN 210318449 U CN210318449 U CN 210318449U CN 201921044819 U CN201921044819 U CN 201921044819U CN 210318449 U CN210318449 U CN 210318449U
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Abstract
The utility model discloses a lubricating arrangement of horizontal gyration bull gear tooth post is for overcoming the current lubrication to gyration bull gear tooth post on large-scale handling machinery, and the manual work is paintd the lubricating grease work efficiency and is low, and the shut down operating time is long to lead to equipment utilization to hang down, and the protection film of establishing after painting the grease can not be lasting, and the shortcoming that the lubricating grease loss is high provides. An oil distributor connected with a high-pressure oil supply pipeline is arranged on a lubricating gear which is supported on one side of the large gear ring and meshed with the large gear ring, oil distribution pipes on the oil distributor are respectively connected with an inner oil duct on the lubricating gear body, oil inlets of a plurality of touch one-way oil discharge valves are connected with the inner oil duct, oil outlets of the touch one-way oil discharge valves are communicated with the tooth surface of each gear, and touch heads on the valves extend out of the tooth surface. The gear teeth are meshed to extrude the oil leakage of the touch contacts to the surface of the tooth column of the large gear ring to automatically form a protective film, so that the service life of the gear teeth is prolonged, the human resource is saved, the labor intensity is reduced, the oil consumption and the environmental pollution are reduced, and the equipment utilization rate is improved.
Description
Technical Field
The utility model belongs to a maintain the maintenance facility, specifically speaking are to the lubricating arrangement of the big ring gear tooth post with horizontal operating condition gyration.
Background
The port is often provided with a large gear ring which works in a horizontal state on heavy machinery, such as large hoisting machinery like a portal crane and a stacker-reclaimer, and a hoisting mechanism of the port is driven by a self slewing mechanism to transfer goods from one place to another place. A large gear ring is horizontally arranged below a rotary platform seat frame of the loading and unloading machine, and a motor drives the large gear ring to rotate through a driving gear on a speed change mechanism.
The diameter of the large gear ring is about 6 and 7 meters generally, and the structure of the large gear ring is that a plurality of tooth columns are vertically arranged between two parallel and opposite circular plate sheets at equal intervals, and a driving gear is meshed with the tooth columns on the large gear ring to drive the large gear ring to rotate in the working process. The large gear ring bears the weight of the whole hoisting system, is responsible for driving the hoisting system to rotate, and is a key large-scale component on a loading and unloading machine.
The busy lifting work enables the large gear ring to rotate very frequently, when the driving gear is meshed with a tooth column of the large gear ring to rotate, the contact part of two tooth surfaces is frequently subjected to extrusion friction, and if the driving gear is not maintained and is seriously abraded, the large gear ring needs to be integrally disassembled to be replaced. Generally, the service life of the lubricating device should be the same as that of the whole device as long as the lubricating device is lubricated and maintained in time in use. Because the large gear ring is high in manufacturing cost and troublesome in disassembly and assembly, if the large gear ring is replaced after being abraded, the occupied downtime is prolonged, the normal operation is seriously influenced, and the maintenance cost and the production cost are increased, so that the basic method for solving the abrasion is realized by enhancing the lubrication and maintenance.
At present, the lubrication and maintenance of the large gear ring tooth column is a mode of manually coating paste lubricating grease on each tooth column one by one, so that although the service life of the large gear ring tooth column can be prolonged, the large gear ring tooth column lubrication and maintenance method has the following problems:
firstly, because the working environment of the hoisting machine is poor, in order to prevent dust from falling on the gear teeth and being abraded in an aggravated manner when the dust is meshed, dust covers are arranged around the large gear ring, the machine is stopped to remove the dust covers before lubricating grease is coated, the dust covers are restored to the original positions after the lubricating grease is coated and maintained one by one, and the time of normal production occupied by the dismounting operation is too long;
secondly, the workload of manually coating lubricating grease is large, taking a large gear ring of a maintenance stacker-reclaimer as an example, the number of tooth columns installed on the large gear ring is as many as 114, about 90 minutes is needed only to be completely coated on the large gear ring, and the time for assembling and disassembling the dust cover is added together, so that the time for influencing normal production is longer, and the utilization rate of equipment is low;
thirdly, the large gear ring belongs to an open gear structure, the coating of lubricating grease belongs to one-time full-loss maintenance, a layer of covering film is left on the surface of the tooth column during the coating, and after two gears are meshed and extruded, the oil film covered on the two gears is damaged, the lubricating grease is coated once again after the two gears are meshed once to establish the oil film again, so that the workload is large to an astonishing degree;
furthermore, the large ring gear has a large diameter, and the grease is also separated from the tooth surface by the centrifugal force generated by the rotation.
The above reasons not only cause high consumption of grease and environmental pollution, but also it is impractical to shut down the machine in the above operation manner to disassemble and assemble the dust cover and apply grease before starting the machine.
At present, in the mode adopted for lubricating the gear teeth of a common open gear, a driven lubricating gear meshed with the lubricated gear is installed on one side of the lubricated gear, an oil storage cavity is arranged in the gear body of the lubricated gear or a gear shaft for installing the lubricated gear to store liquid lubricating oil, under the condition of good fluidity of the lubricating oil, an inner oil duct on the gear body is communicated with a one-way valve installed on the gear teeth of the open gear, and the oil outlet of the one-way valve is extruded by meshing of two gear teeth, so that the automatic lubrication of the surface of the gear teeth of the open gear meshed with the lubricated gear is realized.
The gear teeth of the open gear are lubricated by the method, the gear teeth are only suitable for lubricating a gear working in a vertical state by liquid lubricating oil, for a gear running in a horizontal state, particularly for a tooth column of a gear ring with a diameter of 6 to 7 meters, the liquid lubricating oil flowing out of an oil outlet of the lubricating gear easily flows to the lower side along tooth grooves between two teeth, a complete protective film cannot be formed on the surface of the gear teeth, and the liquid lubricating oil quickly flows to cause large consumption and serious environmental pollution. Under the normal working state of the horizontal large gear ring, the abrasion of the tooth column is reduced, only pasty lubricating grease can be hung on the surface of the tooth column, and the pasty lubricating grease stored by the mode cannot be pushed to the surface of the gear teeth at all due to poor flowing property.
Under the condition of not influencing normal operation, the problem that the problem is needed to be solved at present is to ensure that the large gear ring tooth column working in a horizontal state is always in a lubricating state.
Disclosure of Invention
The utility model aims to solve the technical problems that the work efficiency of manually coating the paste lubricating grease is low, the normal operation is influenced due to the long stop operation time, the utilization rate of equipment is low, and an oil film established by coating the lubricating grease at one time is damaged immediately after being meshed by overcoming the existing large gear ring tooth column working in a lubrication horizontal state; the lubricating device for the gear column of the horizontal rotary large gear ring is provided, wherein the gear which works in a horizontal state is lubricated by liquid lubricating oil, so that oil is not easy to form a protective film on the gear surface, and the lubricating device has the defects of high oil loss and environmental pollution.
In order to solve the above problems existing in the prior art, the utility model discloses an adopt following technical scheme to realize: the lubricating device of bull gear tooth post includes: the driven lubricating gear is meshed with the large gear ring, and an inner oil duct on a lubricating gear body is communicated with a one-way oil unloading valve with a contact extending out of the tooth surface of the gear; the vertical shaft for mounting the lubricating gear is vertically supported on an equipment support on one side of the large gear ring by a bearing, a main oil duct is arranged on the central line of one end, away from the lubricating gear, of the vertical shaft, a high-pressure oil pump for conveying pasty lubricating grease is connected to the inlet of the main oil duct through a one-way high-pressure rotary joint, an oil distributor is mounted on the lubricating gear, the oil inlet of the oil distributor is communicated with the main oil duct, and a plurality of oil distribution pipes on the oil distributor are communicated with one-way oil discharge valves, which are communicated with tooth surfaces on two sides of the lubricating gear, on each gear through inner oil ducts which are the same.
The utility model discloses still have following technical characteristic:
oil pools which can enable lubricating grease to diffuse along the width direction of the gear surface are respectively arranged at the positions where the one-way oil discharge valves are installed on the surfaces of the gear teeth of the lubricating gear;
the structure of the one-way oil drain valve is that a compression spring with one end seated on the annular bottom surface of the valve body is arranged in a cavity of the valve body, a bulge arranged on a steel ball is arranged at the other end of the compression spring in the direction opposite to the opening of the cavity, an external thread on an annular gland is screwed on an internal thread at the opening part of the cavity of the one-way oil drain valve, an internal spherical surface on the annular gland is matched with an external spherical surface of the steel ball, and the bulge is higher than the surface of the teeth of the lubricating gear;
the oil inlet of the oil separator is connected with the main oil duct, a transverse oil duct which is communicated with the main oil duct along the radial direction of a vertical shaft is arranged at the position of the main oil duct close to the lubricating gear end, and the outer end of the transverse oil duct is connected to the oil inlet of the oil separator through a side oil pipe;
the one-way oil discharge valve is installed by respectively arranging internal threads on oil channel openings of the inner oil channel, which lead to tooth surfaces on two sides of each gear tooth, and the external threads on the one-way oil discharge valve are screwed on the internal threads;
an oil storage device capable of storing lubricating grease is arranged on the lubricating gear, and the lower end of the oil storage device is connected to a transverse oil duct which is arranged on the vertical shaft and communicated with the main oil duct through an oil storage pipe;
the oil separator is a progressive plate type oil separator.
The utility model has the advantages and positive effects that the lubricating grease supplied to the horizontal large gear ring tooth post through the driven lubricating gear is pasty oil with poor fluidity, the high-pressure oil pump is connected to the high-pressure oil supply pipeline through the high-pressure rotary joint and is supplied to the oil distributor, the oil distributor supplies the one-way oil discharge valve installed on each tooth surface, when the lubricating gear is meshed with the tooth post of the large gear ring to open the one-way oil discharge valve, the lubricating gear can be discharged to the surface of the tooth post under high pressure and cannot flow off, and a new oil film can be automatically established once when the lubricating gear rotates one tooth post, so that the large gear ring always works in a lubricating state, and the service life of the whole large gear ring is ensured to be as long as that of the whole loading and unloading equipment; because the whole oil supply system is connected by the check valve, the oil pressure of the oil supply system can be stably maintained even if the high-pressure oil pump stops working, lubricating grease can not be supplied discontinuously when the equipment is restarted after being stopped, and oil materials cannot be wasted.
After the device is used, the manual operation of stopping the machine for coating the lubricating grease is not needed, the production time occupied by lubricating and maintaining is reduced, the labor intensity of workers is reduced, the manpower resource is saved, the utilization rate of equipment is improved, the consumption of the lubricating grease is saved, the pollution to the surrounding environment is also reduced, the maintenance cost is reduced, and the economic benefit of enterprises is improved.
Drawings
Fig. 1 is a schematic view of the installation structure of the present invention;
FIG. 2 is a schematic view of the rotation of the A-direction partial structure of FIG. 1;
fig. 3 is a schematic structural view of the touch type one-way oil drain valve in fig. 1.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
In fig. 1, the lubricating device for the tooth post 2.1 on the large gear ring 2 which is driven by the driving gear 1 to horizontally rotate comprises: the driven lubricating gear 3 is meshed with the large gear ring 2, and an inner oil duct 3.4 in the gear body of the lubricating gear 3 is communicated with a one-way oil discharge valve 3.1 with a gear tooth surface contact extending out of the gear tooth; the vertical shaft 7 for mounting the lubricating gear 3 is vertically supported on the equipment bracket at one side of the large gear ring 2 by a bearing mounted in a bearing seat 7.2 (see figure 2). A main oil duct 7.1 through which paste lubricating grease can pass is arranged on a center line of one end, away from the lubricating gear 3, of the vertical shaft 7, a high-pressure oil supply pipe 5 led out from a high-pressure oil pump is connected to an inlet of the main oil duct 7.1 through a one-way high-pressure rotary joint 6, an oil distributor 4 is installed on the lubricating gear 3, an oil inlet of the oil distributor 4 is communicated with the main oil duct 7.1, a plurality of oil distribution pipes 4.1 on the oil distributor 4 are communicated with oil inlets of one-way oil discharge valves 3.1, which are communicated with tooth surfaces on two sides of each gear tooth, through inner oil ducts 3.4 which are equal in number to the gear teeth of the lubricating gear 3, respectively, and contacts on the one-way oil discharge valves 3.
In order to cover the whole surface of the tooth column 2.1 of the large gear ring 2 with grease to form a complete coating film, an oil pool 3.41 which can spread the grease discharged from the one-way oil discharge valve 3.1 in the width direction of the tooth surface is arranged on the tooth surface of the tooth of the lubricating gear 3 at the position where the one-way oil discharge valve 3.1 is installed. When the lubricating gear 3 rotates along with the large gear ring 2, the tooth surfaces of the two gear teeth are in contact, so that lubricating grease with high pressure is gushed out through the one-way oil unloading valve 3.1 and is filled into the oil pool 3.41, and the lubricating grease can be stained on the whole surface of the tooth column 2.1.
The structure of the one-way oil drain valve 3.1 (see fig. 3) is that a compression spring 3.2 with one end seated on an annular bottom surface 3.12 is arranged in a cavity of a valve body of the one-way oil drain valve 3.1, a bulge 3.31 arranged on a steel ball 3.3 is seated at the other end of the compression spring 3.2 in the direction opposite to the cavity opening of the valve body, an inner spherical surface 3.51 on an annular gland 3.5 is matched with an outer spherical surface of the steel ball 3.3, an external thread 3.52 on the annular gland 3.5 is screwed on an internal thread at the cavity opening of the one-way oil drain valve 3.1, and the bulge 3.31 on the steel ball 3.3 is higher than the tooth surface of the teeth of the lubricating gear.
When the lubricating gear 3 rotates along with the large gear ring 2, the two tooth surfaces contact and press the protrusions 3.31, and grease discharged from the one-way oil discharge valve 3.1 is forced to adhere to the surface of the tooth column 2.1 to form a protective film.
The pre-tightening force of the compression spring 3.2 can be adjusted by adjusting the position of the annular gland 3.5 screwed on the internal thread of the valve body of the one-way oil discharge valve 3.1, so that the whole oil supply system is sealed with the outside, and the lubricating grease in the oil supply system is always in a high-pressure state.
The inner oil duct 3.4 of each gear tooth on the lubricating gear 3 is punched from the tooth top and connected in a turning way (see figure 2), the part of the tooth top, which is positioned outside the oil pool 3.41, is a fabrication hole, and the end of the fabrication hole is blocked by a block 3.6 to keep sealing.
The oil inlet of the oil separator 4 is connected with the main oil gallery 7.1, the main oil gallery 7.1 is a blind hole with an impermeable lower end, a transverse oil gallery 7.3 communicated with the main oil gallery 7.1 along the radial direction of the vertical shaft 7 is arranged at a position, close to one end of the lubricating gear 3, of the main oil gallery 7.1, and the outer end of the transverse oil gallery 7.3 is connected to the oil inlet of the oil separator 4 through a side oil pipe 4.2.
The one-way oil drain valve 3.1 is installed by respectively arranging internal threads on oil port openings of tooth surfaces on two sides of each gear tooth, which are communicated with the inner oil duct 3.4, of the lubricating gear 3, respectively screwing external threads 3.11 (see figure 3) on a valve body of the one-way oil drain valve 3.1 onto the internal threads, and enabling protrusions 3.31 on the steel balls 3.3 to face the tooth surfaces on two sides of the gear tooth and be higher than the tooth surfaces. The one-way oil discharge valve 3.1 is screwed to adjust the installation depth of the one-way oil discharge valve on the lubricating gear 3, so that the height of the tooth surface of the protrusion 3.31 exposed out of the lubricating gear 3 can be adjusted, the opening degree of an oil discharge opening of the one-way oil discharge valve 3.1 is controlled to adjust the oil discharge amount, and oil waste is avoided.
In order to ensure that the supplied lubricating grease is not wasted and is not supplied halfway, an oil storage 8 capable of storing paste lubricating grease is arranged on the lubricating gear 3, and the lower end of the oil storage 8 is connected with a transverse oil duct 7.3 on the right side of the shaft diameter of the vertical shaft 7 through an oil storage pipe 8.1 and is communicated with a transverse oil duct 7.3 on the left side of a main oil duct 7.1 to form an oil duct (see fig. 2);
when the oil pressure in the oil separator 4 is short due to reasons, the pressure in the oil supply system can be automatically balanced and the oil can be adjusted and supplemented from the oil storage device 8, so that the continuity of the lubricating work is further ensured, and the double-insurance effect is realized for keeping the oil pressure of the oil supply system when the high-pressure oil pump is frequently started and stopped; meanwhile, when the protrusion 3.31 extending out of the tooth surface is adjusted from long to short and the opening degree of the oil outlet is decreased from large, redundant grease in the one-way oil discharge valve 3.1 can be stored in the oil reservoir 8.
When the rotating mechanism of the loading and unloading machine stops rotating, a plurality of gear teeth of the lubricating gear 3 always keep in contact with a tooth column 2.1 of the rotating large gear ring 2, and at the moment, a bulge 3.31 on a one-way pressure relief valve 3.1 in contact with the tooth column 2.1 is still pressed to release oil;
in order to avoid the grease in the line from being continuously gushed in the above state, the oil separator 4 mounted on the lubricated gear 3 is provided as a progressive plate type distributor for reasonably distributing the amount of grease supplied to each line. The gear teeth of the lubricating gear 3 are meshed with the gear columns 2.1 to be separated, each one-way pressure release valve 3.1 continuously acts from being pressed to being reset, the progressive plate type distributor can automatically and continuously adjust proper oil injection along with the gear teeth according to the sequence of the gear teeth, the oil output amount is proper no matter how long time passes, and therefore reasonable utilization of lubricating grease is achieved without waste.
The oil supply system automatically controls the using amount of the lubricating grease, changes the intermittent lubrication of the existing open gear into automatic continuous lubrication, saves the consumption of the lubricating grease on the basis of ensuring the lubricating effect, reduces the maintenance cost, and reduces the waste of the lubricating grease and the pollution to the environment.
When the large loading and unloading machine works, high-pressure oil supplied from a high-pressure oil pump through a high-pressure oil supply pipe 5 enters an oil distributor 4 through a one-way high-pressure rotary joint 6 through a main oil duct 7.1 and then is communicated with a one-way oil discharge valve 3.1 provided with a contact on each tooth surface of the lubricating gear 3 in a follow-up mode, the lubricating gear 3 is meshed with a tooth column 2.1 of the large gear ring 2 to extrude a bulge 3.31 on the one-way oil discharge valve 3.1, a new oil film is continuously formed on the tooth column 2.1, the existing intermittent lubrication is changed into continuous lubrication, and the large gear ring 2 is guaranteed to work in a lubrication state all the time.
The lubricating gear 3 synchronously and continuously supplies lubricating grease to the tooth column 2.1 for lubrication maintenance along with the rotation of the large gear ring 2, so that the service life of the large gear ring 2 and the service life of the whole large-scale equipment are ensured, the operation of stopping, dismounting and mounting a dust cover and manually coating are not needed, the production time occupied by the maintenance and lubrication work is reduced, the labor intensity of workers is reduced, the utilization rate of the equipment is greatly improved, and the maintenance cost is also reduced.
The lubricating device can also be used for lubricating and maintaining the open gear which works in a horizontal state on other various large machines, and can also be used for lubricating and maintaining the open gear which works in a vertical state.
The above embodiments are only illustrative illustrations of the present invention, not the only technical solutions, and all modifications or equivalent replacements performed by the technical solutions of the present invention as the gist are within the protection scope of the present invention.
Claims (7)
1. The utility model provides a lubricating arrangement of big ring gear tooth post of horizontal gyration, includes the driven type lubricating gear who meshes mutually with big ring gear, has the one-way oil drain valve that stretches out its flank of tooth contact on its teeth of inner oil duct intercommunication on the lubricating gear wheel body, its characterized in that: the lubricating gear comprises a vertical shaft, a bearing, a main oil duct, a high-pressure oil pump, an oil distributor, a plurality of oil distributing pipes and a one-way oil unloading valve, wherein the vertical shaft is provided with a lubricating gear, the bearing is vertically supported on an equipment support on one side of a large gear ring, the center line of one end, away from the lubricating gear, of the vertical shaft is provided with the main oil duct, the high-pressure oil pump is used for conveying pasty lubricating grease and is connected to the inlet of the main oil duct through a one-way high-pressure rotary joint, the oil inlet of the oil distributor is communicated with the main oil duct, and the oil distributing pipes on the oil distributor are.
2. The lubrication device for a horizontally-revolving large ring gear tooth column according to claim 1, wherein: and oil pools which can enable lubricating grease to diffuse along the width direction of the gear surface are respectively arranged at the positions where the one-way oil discharge valves are installed on the surfaces of the gear teeth of the lubricating gear.
3. The lubrication device for a horizontally-revolving large ring gear tooth column according to claim 1, wherein: the structure of the one-way oil drain valve is that a compression spring with one end seated on the annular bottom surface of the valve body is arranged in a cavity of the valve body, a bulge arranged on a steel ball is arranged at the other end of the compression spring in a direction opposite to the opening of the cavity, an external thread on an annular gland is screwed on an internal thread at the opening part of the cavity of the one-way oil drain valve, an internal spherical surface on the external thread is matched with an external spherical surface of the steel ball, and the bulge is higher than the surface of the teeth of a lubricating gear.
4. The lubrication device for a horizontally-revolving large ring gear tooth column according to claim 1, wherein: the oil inlet of the oil separator is connected with the main oil duct, a transverse oil duct communicated with the main oil duct along the radial direction of a vertical shaft is arranged at the position of one end of the main oil duct close to the lubricating gear, and the outer end of the transverse oil duct is connected to the oil inlet of the oil separator through a side oil pipe.
5. The lubrication device for a horizontally-revolving large ring gear tooth column according to claim 1 or 3, characterized in that: the one-way oil discharge valve is installed by respectively arranging internal threads on oil channel openings of the inner oil channel leading to tooth surfaces on two sides of each gear tooth, and the external threads on the one-way oil discharge valve are screwed on the internal threads.
6. The lubrication device for a horizontally-revolving large ring gear tooth column according to claim 1, wherein: an oil storage device capable of storing lubricating grease is mounted on the lubricating gear, and the lower end of the oil storage device is connected to a transverse oil duct which is arranged on the vertical shaft and communicated with the main oil duct through an oil storage pipe.
7. The lubrication device for a horizontally-revolving large ring gear tooth column according to claim 1 or 4, characterized in that: the oil separator is a progressive plate type oil separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921044819.2U CN210318449U (en) | 2019-07-05 | 2019-07-05 | Lubricating device for gear column of horizontal rotary large gear ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921044819.2U CN210318449U (en) | 2019-07-05 | 2019-07-05 | Lubricating device for gear column of horizontal rotary large gear ring |
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| Publication Number | Publication Date |
|---|---|
| CN210318449U true CN210318449U (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921044819.2U Expired - Fee Related CN210318449U (en) | 2019-07-05 | 2019-07-05 | Lubricating device for gear column of horizontal rotary large gear ring |
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| CN (1) | CN210318449U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219974A (en) * | 2019-07-05 | 2019-09-10 | 青岛港国际股份有限公司 | The lubricating arrangement of horizontal rotation bull gear tooth post |
| CN113753642A (en) * | 2021-09-14 | 2021-12-07 | 江苏金韦尔机械有限公司 | Middle film rolling machine |
| EP4008678A1 (en) | 2020-12-07 | 2022-06-08 | Hiab AB | A crane comprising a crane column and a pump for lubrication of bearings |
-
2019
- 2019-07-05 CN CN201921044819.2U patent/CN210318449U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219974A (en) * | 2019-07-05 | 2019-09-10 | 青岛港国际股份有限公司 | The lubricating arrangement of horizontal rotation bull gear tooth post |
| EP4008678A1 (en) | 2020-12-07 | 2022-06-08 | Hiab AB | A crane comprising a crane column and a pump for lubrication of bearings |
| CN113753642A (en) * | 2021-09-14 | 2021-12-07 | 江苏金韦尔机械有限公司 | Middle film rolling machine |
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