A hydraulic support

Abstract

The present invention relates to a walking-type roof support for mining, and particularly to a hydraulic support. The hydraulic support includes a base, a roof beam, columns and guide columns. The columns include left and right paired front columns and rear columns. The front and rear columns are both telescopic columns. The two ends of the front and rear columns are respectively connected to the base and the roof beam, and drive the roof beam to lift and lower during telescoping. The guide columns are arranged in left and right pairs, and the upper and lower ends are respectively connected to the base and the roof beam. When the roof beam lifts and lowers, the guide columns telescopically guide in the up and down direction. The left and right two guide columns are arranged at intervals, and a sight passage that is transparent in the front and rear directions is reserved therebetween. Through this sight passage, it is convenient to observe the swinging state of the rear swing beam of the hydraulic support and the working states of equipment such as the rear conveyor, so as to avoid collisions or interferences between the swing beam and the scraper conveyor on the rear roof beam and other related mechanisms caused by improper operation.

Description

Technical Field

[0001] The present invention relates to a walking type mine roof support for mining, and particularly to a hydraulic support. Background Art

[0002] Hydraulic supports are relatively important and key support equipment in mining engineering operations. With the continuous maturity of mineral deposit mining technologies, various hydraulic supports for different requirements have emerged. For example, the Chinese utility model patent with the authorization announcement number CN205638519U discloses a solid filling support for thin coal seams. This support includes a base, on which a roof beam is supported by front and rear columns. The front and rear columns are both telescopic columns, and the lifting of the roof beam relative to the base is realized. A four-link mechanism is connected between the roof beam and the base. The four-link mechanism is located between the front and rear columns and plays a role in stably supporting the roof beam during the lifting process of the roof beam. In addition, there is a ramming mechanism and a conveyor at the rear end of the base. The ramming mechanism includes a swing beam that can swing up and down around a hinge point. The compaction plate at the rear end of the swing beam can extend and retract under the driving action of a compaction jack to ram the gangue at the rear side of the support.

[0003] This type of hydraulic support is mainly applicable to thin coal seams, with a support height between 1.4 m and 2.6 m. After the roof beam is lifted, the space under the support is relatively limited, and the four-link mechanism is located between the front and rear columns and occupies the middle space of the support. When the staff operates at the front end of the support to adjust the swing of the rear swing beam, due to the obstruction of the four-link mechanism, it is not convenient to observe the swing state of the rear swing beam of the hydraulic support and the working state of equipment such as conveyors, and it is easy to cause improper operation, resulting in collisions or interferences between the swing beam and the conveyor on the roof beam and other related structures. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydraulic support to solve the problem that it is inconvenient to observe the rear end situation during the use of existing supports, which easily causes collisions and interferences between the swing beam and other structures at the rear end of the support.

[0005] The hydraulic support of the present invention adopts the following technical solutions: The hydraulic support includes: a base; a roof beam; columns, including left and right pairs of front columns and rear columns. The front and rear columns are both telescopic columns. The two ends of the front and rear columns are respectively connected to the base and the roof beam, and drive the roof beam to lift when telescoping. It also includes: guide columns, arranged in left and right pairs, and the upper and lower ends are respectively connected to the base and the roof beam. When the roof beam lifts, the guide columns guide and telescope in the up and down direction. The left and right two guide columns are arranged at intervals, and a sight line channel that is transparent in the front and rear directions is reserved between the two.

[0006] The beneficial effects of the present invention are as follows: In the hydraulic support of the present invention, the guiding columns play a guiding role in the lifting of the top beam. The guiding columns are arranged in pairs on the left and right, and a sight passage that is transparent in the front and rear directions is reserved between the left and right guiding columns. In this way, when the operator operates at the front end of the hydraulic support, the swinging state of the swing beam at the rear of the hydraulic support can be conveniently observed through the sight passage, so as to avoid collisions or interferences between the swing beam and the scraper conveyor on the rear top beam and other related mechanisms caused by improper operations.

[0007] Further, the left and right guiding columns correspond to the front and rear columns in the front-rear direction.

[0008] The beneficial effects are as follows: The left and right guiding columns correspond to the front and rear columns in the front-rear direction, so as to reserve a relatively large range of sight passages between the two guiding columns, and expand the swinging range of the swing beam that can be observed through the above-mentioned sight passage and the swinging range of the swing beam.

[0009] Further, the left and right guiding columns are respectively located at the positions between the front and rear columns on the corresponding sides.

[0010] The beneficial effects are as follows: The above-mentioned position setting of the guiding columns helps to make the overall balance of the top beam, so that the top beam is not easily offset in the front-rear and left-right directions.

[0011] Further, the top beam includes a front top beam and a rear top beam hinged through a horizontal axis. The upper end of the front column is connected to the front top beam, the upper end of the rear column is connected to the rear top beam, and the upper end of the guiding column is connected to the hinge axis of the front and rear top beams.

[0012] The beneficial effects are as follows: The above-mentioned setting of the front and rear top beams and the position setting of the guiding columns can form an angle between the front and rear top beams and the horizontal plane to adapt to the top rock formations of different heights, and improve the adaptability of the hydraulic support to different strata.

[0013] Further, the guiding column is a piston structure, including a piston cylinder and a piston rod that is slidably installed in the piston cylinder in a guiding manner. One of the piston cylinder and the piston rod is connected to the base, and the other is connected to the top beam.

[0014] The beneficial effects are as follows: The guiding column of the piston structure has a simple structure, which is convenient for the height of the guiding column to be freely adjusted according to the height of the top beam, and is easy to be realized in the present invention.

[0015] Further, the lower end of the piston cylinder is inserted into the fixed groove and is assembled together relatively fixed in the up-down direction, and the piston rod is connected to the top beam.

[0016] The beneficial effects are as follows: The setting of the fixed groove on the base can keep the guiding column in a vertical state all the time, so that the guiding column plays a better guiding role when the top beam is lifted and lowered. Moreover, the above-mentioned form of movable assembly is convenient for the processing and assembly of the entire hydraulic support.

[0017] Further, a connecting seat is provided on the edge of the fixing groove, a connecting ear is arranged on the outer side of the piston cylinder, horizontal through holes are correspondingly formed in the connecting ear and the connecting seat, and the connecting ear and the connecting seat are fixedly assembled in the up-and-down direction through a bolt inserted into the horizontal through hole.

[0018] The beneficial effect is that the above-mentioned connecting ear and bolt structure is simple, which is convenient for the fixed connection between the piston cylinder and the base.

[0019] Further, the guiding column is a hydraulic cylinder. Among the cylinder body and the piston rod of the hydraulic cylinder, one is fixedly connected to the base, and the other is connected to the top beam. The hydraulic support further includes a hydraulic control oil circuit system that matches the hydraulic cylinder. When the hydraulic cylinder is required to provide support, the hydraulic control oil circuit system fills the hydraulic cylinder with oil and pressurizes it. When the hydraulic cylinder is required to provide guidance, the hydraulic cylinder is connected to normal pressure and the cylinder body and the piston rod expand and contract following the movement when the top beam rises and falls.

[0020] The beneficial effect is that in special use cases, the above-mentioned hydraulic cylinder can support the top beam in the entire hydraulic support under the control of the hydraulic control oil circuit system, further improving the load-bearing capacity of the hydraulic support.

[0021] Further, the top beam includes front and rear top beams hinged through a horizontal axis. The upper end of the front upright is connected to the front top beam, and the upper end of the rear upright is connected to the rear top beam. Front and rear connecting supports are respectively arranged on the front and rear top beams, and an adjustable balance member is connected between the front and rear connecting supports.

[0022] The beneficial effect is that the adjustable balance member can adapt to the adjustment of the inclination angle of the top beam, which helps the top beam to maintain balance during the adjustment process.

[0023] Further, the adjustable balance member is a balance jack.

[0024] The beneficial effect is that the balance jack has a simple structure and is easy to implement in the present invention.

[0025] Further, the front and rear connecting supports are respectively arranged in pairs on the left and right. There are two adjustable balance members, which are arranged at intervals in the left-right direction.

[0026] The beneficial effect is that the arrangement form of the above-mentioned connecting supports and the number setting of the adjustable balance members help to increase the visible space of the sight channel and avoid the adjustable balance members or the connecting supports from blocking the operator's observation of the position and movement of the swing beam. Description of the Drawings

[0027] Figure 1 It is the front view of the hydraulic support in the specific embodiment 1 of the hydraulic support of the present invention;

[0028] Figure 2Left view of the hydraulic support in Specific Embodiment 1 of the hydraulic support of the present invention (hiding the swing beam and the compaction plate);

[0029] Figure 3 Right view of the hydraulic support in Specific Embodiment 1 of the hydraulic support of the present invention (hiding the swing beam and the compaction plate);

[0030] Figure 4 Stereogram of the hydraulic support in Specific Embodiment 1 of the hydraulic support of the present invention (hiding the swing beam and the compaction plate);

[0031] Figure 5 Structural schematic diagram of the guide post in Specific Embodiment 1 of the hydraulic support of the present invention;

[0032] In the figure: 1 - base, 2 - front upright post, 3 - rear upright post, 4 - swing beam, 5 - compaction plate, 6 - swing beam jack, 7 - front top beam, 8 - rear top beam, 9 - hinge shaft, 10 - guide post, 11 - scraper conveyor, 12 - piston cylinder, 13 - piston rod, 14 - connection seat, 15 - connection ear, 16 - sleeve, 17 - front connection support, 18 - rear connection support, 19 - balance jack. Detailed Description of the Invention

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0034] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0035] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0036] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.

[0037] Specific Embodiment 1 of the hydraulic support of the present invention:

[0038] In this embodiment, the filling hydraulic support is taken as an example to illustrate the present invention. Of course, in other embodiments, the hydraulic support can also be an ordinary hydraulic support, that is, a hydraulic support without a ramming mechanism at the rear end.

[0039] As Figures 1 to 4 shown, in this embodiment, the hydraulic support includes a base 1 and a roof beam. The roof beam is located above the base 1. Columns are provided between the base 1 and the roof beam. The columns include a front column 2 and a rear column 3 arranged at intervals in the front-rear direction. There are two front columns 2, and they are arranged in pairs in the left-right direction. There are also two rear columns 3, and they are arranged in pairs in the left-right direction. A ramming mechanism hinged to the base 1 is provided at the rear end of the base. The ramming mechanism includes a swing beam 4 and a compaction plate 5 provided on the swing beam 4. The compaction plate 5 can be telescoped along the length direction of the swing beam 4 under the drive of a hydraulic cylinder to push materials. A scraper conveyor 11 is suspended above the swing beam 4 at the rear end of the roof beam. Two swing beam jacks 6 are also provided between the swing beam 4 and the roof beam, and they are arranged at intervals in pairs in the left-right direction. Under the action of the swing beam jacks 6, the swing beam 4 and the compaction plate 5 can swing up and down to ram the gangue under the swing beam 4 and the compaction plate 5 and compact the filling material within the full mining height range.

[0040] In this embodiment, as Figure 1 and Figure 4As shown in the figure, the top beam includes a front top beam 7 and a rear top beam 8 arranged in the front-rear direction. The front top beam 7 and the rear top beam 8 are hinged together by a hinge shaft 9 extending in the left-right direction. The lower end of the front upright 2 is hinged to the base 1, and the upper end is hinged to the front top beam 7 for supporting the front top beam 7. The lower end of the rear upright 3 is hinged to the base 1, and the upper end is hinged to the rear top beam 8 for supporting the rear top beam 8 and driving the rear top beam 8 to lift. Both the front upright 2 and the rear upright 3 are telescopic uprights, which can respectively drive the front top beam 7 and the rear top beam 8 to lift, and can make the front top beam 7 and the rear top beam 8 form non-zero angles with the horizontal plane respectively to adapt to the top rock layers of different heights and improve the adaptability of the hydraulic support to different strata.

[0041] In this embodiment, as Figure 1 and Figure 2 shown, a guide post 10 is further provided between the base 1 and the top beam. As the name implies, the guide post is a columnar structure that plays a guiding role. In this embodiment, the guide post includes three sections, and adjacent sections are guidingly matched in the up-down direction and telescopically move following the top beam during lifting. The guide post 10 telescopically guides in the up-down direction, which can ensure that the part of the top beam connected to the guide post 10 guides and moves in the up-down direction. There are two guide posts 10, which are arranged at intervals in the left-right direction to reserve a sight passage that is transparent in the front-rear direction between the two guide posts 10, facilitating the operator located on the front side to observe the swinging state and swinging position of the rear swing beam 4 of the hydraulic support, avoiding collision interference between the swing beam 4 and the conveyor or other related structures at the rear of the hydraulic support during the swinging process, contributing to the normal operation of the hydraulic support. Moreover, the swing beam jacks 6 are arranged in pairs and at intervals in the left-right direction, which can expand the visible space of the sight passage and avoid the swing beam jacks 6 from affecting the operator's monitoring of the movement state of the rear swing beam 4.

[0042] In this embodiment, as Figure 1 and Figure 4 shown, each guide post 10 is located between the front upright 2 and the rear upright 3 on the corresponding side in the front-rear direction, and the front upright 2, the rear upright 3 on the corresponding side and the guide post 10 correspond to each other in the front-rear direction to reserve a relatively large sight passage between the two left-right guide posts 10, which can expand the rear area that the operator can observe through the sight passage, expand the swinging range of the swing beam 4, and improve the working efficiency of the hydraulic support.

[0043] In this embodiment, as Figure 5 shown, the guide post 10 is a piston structure. The guide post 10 includes a piston cylinder 12 and a piston rod 13 that is guidingly and slidably assembled with the piston cylinder 12. The overhanging end of the piston cylinder 12 is fixed to the base 1, and the overhanging end of the piston rod 13 is fixed to the top beam.

[0044] Specifically, as Figure 4As shown in the figure, a fixing groove is provided on the base 1. The fixing groove is a circular groove with an upward opening, and is used for insertion and cooperation with the piston cylinder 12 to ensure that the piston cylinder 12 can be stably and reliably fixed on the base. A connecting seat 14 is provided on the edge of the fixing groove. The connecting seats 14 are arranged at intervals along the circumferential direction of the fixing groove. Correspondingly, connecting lugs 15 are provided on the outer peripheral wall of the piston cylinder 12. The connecting lugs 15 are arranged one-to-one with the connecting seats 14 along the circumferential direction of the piston cylinder 12. Each pair of connecting lugs 15 is arranged in pairs and are respectively located on both sides of the connecting seat 14. Horizontal through holes are provided on each connecting lug 15 and the corresponding connecting seat 14. The horizontal through holes on the connecting lugs 15 and the horizontal through holes on the corresponding connecting seats 14 are coaxially arranged. The connecting seat 14 and the connecting lug 15 are connected by a bolt inserted into the horizontal through holes of both to ensure the relative fixation of the piston cylinder in the vertical direction with respect to the base, and further ensure the reliable fixed connection between the piston cylinder 12 of the guiding column 10 and the base 1.

[0045] As Figure 5 shown, a sleeve 16 is provided at the overhanging end of the piston rod 13. The axis of the sleeve 16 is perpendicular to the axis of the piston rod 13. The sleeve 16 is sleeved on the hinge shaft 9 between the front roof beam 7 and the rear roof beam 8 to realize the fixed connection between the overhanging end of the piston rod 13 and the roof beam, and realize the guiding and balancing function of the guiding column 10 on the roof beam.

[0046] In this embodiment, as Figure 1 and Figure 2 shown, a front connection support 17 protruding downward is provided on the front roof beam 7. The front connection support 17 is located at the rear side of the front upright column 2. A rear connection support 18 protruding downward is provided on the rear roof beam 8. The rear connection support 18 is located at the front side of the rear upright column 3. An adjustable balancing member is connected between the front connection support 17 and the rear connection support 18. In this embodiment, the adjustable balancing member is a balancing jack 19. Both ends of the balancing jack 19 are fixedly connected to the corresponding front connection support 17 and rear connection support 18 through pin shafts. The axis of the pin shaft extends in the left-right direction. The setting of the above-mentioned adjustable balancing member can automatically or manually adjust the length adaptively when the front roof beam 7 and the rear roof beam 8 are arranged at an angle, which helps the front roof beam and the rear roof beam to maintain the balance of the entire roof beam during the angle adjustment process.

[0047] In this embodiment, as Figure 2 shown, there are two adjustable balancing members provided. Corresponding front connection supports 17 and rear connection supports 18 are both provided with two, and are arranged at intervals in the left-right direction of the hydraulic support. The two adjustable balancing members are located between the two guiding columns 10. Since the adjustable balancing member has a certain height, it does not affect the observation of the swinging state of the rear swing beam 4 of the hydraulic support by the operator located at the front side.

[0048] Specific embodiment 2 of the hydraulic support of the present invention:

[0049] The difference from the specific embodiment 1 is as follows: among the two guiding columns arranged at intervals in the left-right direction, the guiding column on the left is located on the right side of the corresponding front column on that side, and the guiding column on the right is located on the left side of the corresponding front column on that side, that is, the distance between the two guiding columns is less than the distance between the two front columns. Such a structural setting can also form a front-rear through implementation channel between the two guiding columns, facilitating the front-side operator to observe the swinging state of the rear swing beam of the hydraulic support, avoiding collisions and interferences between the swing beam and the rear-end structure of the hydraulic support as well as other related structures, and contributing to the normal operation of the hydraulic support.

[0050] In other embodiments, when the dimension of the base in the left-right direction is greater than the dimension of the top beam in the left-right direction and the hinge shaft connecting the front top beam and the rear top beam protrudes in the left-right direction, the guiding column on the left can also be arranged on the left side of the front column on the left, and the guiding column on the right can be arranged on the right side of the front column on the right, that is, the distance between the two guiding columns is greater than the distance between the two front columns.

[0051] Specific embodiment 3 of the hydraulic support of the present invention:

[0052] The difference from the specific embodiment 1 is as follows: there are two guiding columns on the left, and they are respectively on the front and rear sides of the front and rear columns, and there are two guiding columns on the right, and they are respectively on the front and rear sides of the front and rear columns.

[0053] Specific embodiment 4 of the hydraulic support of the present invention:

[0054] The difference from the specific embodiment 1 is as follows: the upper ends of the two guiding columns are both fixed on the front top beam and are connected to the front top beam through a pin shaft extending in the left-right direction.

[0055] In other embodiments, the rear ends of the two guiding columns are both fixed on the rear top beam and are connected to the rear top beam through a pin shaft extending in the left-right direction.

[0056] Specific embodiment 5 of the hydraulic support of the present invention:

[0057] The difference from the specific embodiment 1 is as follows: the guiding column includes two square sleeves inserted into each other. The lower end of the upper square sleeve is inserted into the lower square sleeve, the upper end of the upper square sleeve is hinged on the hinge shaft, and the lower end of the lower square sleeve is fixed on the base.

[0058] In other embodiments, the lower square sleeve can also be directly welded to the base.

[0059] Specific embodiment 6 of the hydraulic support of the present invention:

[0060] The difference from the specific embodiment 1 is as follows: the guiding column includes two sections, and each section is guidingly matched in the up-down direction and telescopically follows the movement when the top beam is lifted or lowered.

[0061] In other embodiments, the number of sections of the guiding columns can also be four or more than five, and adjacent sections are guidingly engaged in the up-and-down direction and telescopically follow the movement when the top beam is lifted or lowered.

[0062] Specific embodiment 7 of the hydraulic support of the present invention:

[0063] The difference from specific embodiment 1 is that the guiding column is a hydraulic cylinder, which includes a cylinder body and a piston rod. The bottom of the cylinder body is fixedly connected to the base by bolts. A sleeve is provided at the top of the piston rod, and the axis of the sleeve is perpendicularly arranged to the axis of the piston rod. The sleeve is sleeved on the hinge shaft between the front top beam and the rear top beam to realize the fixed connection between the overhanging end of the piston rod and the top beam. The hydraulic support includes a hydraulic control oil circuit system, which is matched with the hydraulic cylinder. The hydraulic control oil circuit system can realize the switching between normal-pressure oil and high-pressure oil in the hydraulic cylinder. When it is necessary for the guiding column to support the top beam to a certain extent, oil is filled and pressurized in the hydraulic cylinder, and the hydraulic cylinder and the front and rear columns support the top beam together; when the hydraulic cylinder does not need to play a supporting role, that is, only plays a guiding role, the hydraulic cylinder is connected to the normal-pressure oil. At this time, the cylinder body and the piston rod of the hydraulic cylinder telescopically guide along with the lifting and lowering of the top beam.

[0064] Specific embodiment 8 of the hydraulic support of the present invention:

[0065] The difference from specific embodiment 1 is that no fixed groove is provided on the base. Connecting ears are provided on the outer peripheral surface of the overhanging end of the piston cylinder, and the connecting ears are arranged at intervals along the circumferential direction of the piston cylinder. Bolt through holes extending in the up-and-down direction are provided on the connecting ears. Threaded holes coaxial with the bolt through holes are provided on the base at positions corresponding to the connecting ears. Bolts pass through the bolt through holes on the connecting ears and are tightly connected to the bolt holes to realize the fixed connection between the piston cylinder and the base.

[0066] Specific embodiment 9 of the hydraulic support of the present invention:

[0067] The difference from specific embodiment 1 is that the top beam is of an integral structure, and lifting lugs are provided on the top beam. The piston rod of the guiding column is connected to the lifting lug of the top beam through a pin in the horizontal direction.

[0068] Specific embodiment 10 of the hydraulic support of the present invention:

[0069] The difference from specific embodiment 1 is that there is one adjustable balance member, and both the front connecting support and the rear connecting support are located at the middle position of the top beam in the left-right direction, so that the adjustable balance member is located at the middle position.

[0070] In other embodiments, three, four or more than five adjustable balance members can also be provided, and the adjustable balance members are arranged at intervals in the left-right direction of the top beam to adapt to the adjustment of the angle of the top beam and ensure the balance of the top beam in the left-right direction.

[0071] Specific Embodiment 11 of the hydraulic support of the present invention:

[0072] The difference from Specific Embodiment 1 is that the adjustable leveling cross member includes a double-headed lead screw. Threaded sleeves are respectively hinged on the front and rear connecting supports. The two ends of the double-headed lead screw are respectively screwed into the threaded sleeves. By rotating the lead screw, the elongation or shortening of the length of the lead screw connected between the front connecting support and the rear connecting support can be realized. This lead screw helps the transmission of force between the front and rear roof beams and reduces the strength requirement for the hinge shaft.

[0073] Specific Embodiment 12 of the hydraulic support of the present invention:

[0074] The difference from Specific Embodiment 1 is that there is one swing beam jack, which is arranged at the middle position in the left-right direction of the rear roof beam. The position of the swing beam is relatively high, which can avoid affecting the monitoring of the movement state of the rear swing beam of the hydraulic support by the operator directly in front of the hydraulic system.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the description and drawings of the present invention shall be equally included in the protection scope of the present invention.

Claims

1. A hydraulic support, comprising: A base; A roof beam; Columns, including left and right pairs of front columns and rear columns, both the front and rear columns being telescopic columns; The two ends of the front and rear columns are respectively connected to the base and the roof beam, and drive the roof beam to lift and lower during telescoping; It is characterized in that it further includes: Guide columns, arranged in left and right pairs, and the upper and lower ends are respectively connected to the base and the roof beam. When the roof beam lifts and lowers, the guide columns guide and telescope in the up and down direction; The left and right two guide columns are arranged at intervals, and a sight passage that is transparent in the front and rear directions is reserved between the two. The roof beam includes front and rear roof beams hinged through a horizontal axis. The upper end of the front column is connected to the front roof beam, the upper end of the rear column is connected to the rear roof beam, the upper end of the guide column is connected to the hinge axis of the front and rear roof beams, front and rear connection supports are respectively provided on the front and rear roof beams, and an adjustable balance member is connected between the front and rear connection supports.

2. The hydraulic support according to claim 1, characterized in that, The left and right two guide columns correspond to the front and rear columns in the front and rear directions.

3. The hydraulic support according to claim 1, characterized in that, The left and right two guide columns are respectively located between the front and rear columns on the corresponding side.

4. The hydraulic support according to any one of claims 1 to 3, characterized in that, The guide column is of a piston structure, including a piston cylinder and a piston rod that is slidably installed in the piston cylinder. One of the piston cylinder and the piston rod is connected to the base, and the other is connected to the roof beam.

5. The hydraulic support according to claim 4, characterized in that, A fixed groove is provided on the base, the lower end of the piston cylinder is inserted into the fixed groove, and they are assembled together relatively fixed in the up and down direction, and the piston rod is connected to the roof beam.

6. The hydraulic support according to claim 5, characterized in that, A connection seat is provided on the edge of the fixed groove, a connection ear is arranged on the outside of the piston cylinder, horizontal through holes are correspondingly opened on the connection ear and the connection seat, and the connection ear and the connection seat are fixedly assembled in the up and down direction through a bolt inserted into the horizontal through hole.

7. The hydraulic support according to any one of claims 1-3, characterized in that, The guide column is a hydraulic cylinder. Among the cylinder body and the piston rod of the hydraulic cylinder, one is fixedly connected to the base, and the other is connected to the roof beam. The hydraulic support further includes a hydraulic control oil circuit system that is matched with the hydraulic cylinder. When the hydraulic control oil circuit system needs the hydraulic cylinder to provide support, it fills the hydraulic cylinder with oil and pressurizes it. When the hydraulic control oil circuit system needs the hydraulic cylinder to provide guidance, the hydraulic cylinder is connected to normal pressure and the cylinder body and the piston rod follow and telescope when the roof beam lifts and lowers.

8. The hydraulic support according to any one of claims 1-3, characterized in that, The adjustable balance member is a balance jack.

9. The hydraulic support according to claim 8, characterized in that, The front and rear connection supports are respectively arranged in left and right pairs, there are two adjustable balance members, and they are arranged at intervals in the left and right direction.

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