A fully floating internal spray water sealing structure

Abstract

The present invention discloses a fully floating internal spray water seal structure, in which the water inlet seat and the housing are elastically supported, and a large-hole matching pin is used to limit rotation, ensuring that the water inlet seat has sufficient floating freedom. At the same time, a wear-resistant guide belt is added between the water inlet seat and the spindle wear-resistant sleeve to ensure that the water inlet seat and the spindle wear-resistant sleeve are always coaxial, ensuring that the rotary water seal operates in an optimal state. A flexible water inlet pipe is used to form a water inlet channel for the water inlet seat, ensuring that the free floating of the water inlet seat is not affected. This structure can completely eliminate the influence of bearing clearance and accumulated machining errors on the gap between the sealing surfaces of the rotary water seal. At the same time, it can effectively avoid mutual wear between the water inlet seat and the spindle wear-resistant sleeve, or excessive eccentricity that exceeds the elastic range of the rotary water seal and causes water leakage.

Description

Technical Field

[0001] The invention relates to a cantilever longitudinal axis roadheader solution, in particular to a spray system in the cantilever longitudinal axis roadheader. Background Art

[0002] The existing EBZ cantilever longitudinal axis roadheader has been widely promoted and applied due to its superior performance. The water seal of the spray water channel in the cutting head of this type of roadheader is usually arranged at the front end of the main shaft and located in front of the main bearing.

[0003] In actual use, the radial play of the main bearing in this mist water seal configuration can cause variations in the clearance between the seal seat and the wear sleeve. For example, the clearance of a C3 roller bearing with an inner diameter of 220 mm is 0.22 to 0.29 mm. With wear during use, this radial play increases, typically exceeding 0.5 mm.

[0004] Furthermore, the rotating water seal within the cutting head of this type of tunnel boring machine is mounted on the water inlet seat. Furthermore, the clearance and coaxiality between the water inlet seat and the wear sleeve in the mist water seal structure within the cutting head of this machine depend on the machining and assembly precision of a series of components, including the cutting arm barrel, gland, spindle, wear sleeve, and bearings. This cumulative reliance on the coaxiality and clearances of these components makes it difficult to guarantee the clearance and coaxiality between the water inlet seat and the wear sleeve. However, this clearance is crucial for the proper functioning of the rotating water seal, determining the pre-fabricated compression capacity of the rotating water seal. In actual use, due to accumulated machining errors, the coaxiality error between the water seal surface and the bearing is 0.1mm, which is considered high precision. Conventional rotating water seals, however, require a clearance of 0.25mm between the water seal seat and the transfer shaft.

[0005] To sum up, in the existing water seal structure setting scheme for the mist water channel in the cutting head of a tunnel boring machine, the deviation caused by the accumulation of bearing clearance and machining errors is already equivalent to the allowable clearance between the water seal seat and the rotating shaft. As the use time increases, the bearing wear clearance increases, which will cause rigid contact between the rotating shaft and the water seal seat and severe mutual wear.

[0006] To address this problem, if the sealing surface gap is intentionally enlarged during design, although it can avoid mutual friction between the water seal seat and the rotating shaft, excessive eccentricity will exceed the elastic range of the rotating water seal and lose the sealing effect.

[0007] It can be seen that providing a stable and reliable water sealing solution for the spray water channel in the cutting head of the roadheader is an urgent problem to be solved in this field. Summary of the Invention

[0008] In view of the problems existing in the water sealing scheme of the existing internal spray water channel of the cutting head of the tunnel boring machine, the purpose of the present invention is to provide a fully floating internal spray water sealing structure to cooperate with the internal spray water channel of the cutting head of the tunnel boring machine to form a stable and reliable water seal.

[0009] In order to achieve the above-mentioned object, the present invention provides a fully floating internal spray water seal structure, which includes a front cover, a rear cover, a flexible water inlet pipe, an elastic floating support assembly, a limit bolt, a wear-resistant sleeve, a wear-resistant guide belt, a rotating water seal and a floating water inlet seat;

[0010] The front cover and the rear cover are correspondingly arranged between the cutting head and the cutting arm of the tunnel boring machine, and a floating placement area is formed between the two;

[0011] The flexible water inlet pipe is connected to the waterway outlet built into the cutting arm and the water inlet joint of the floating water inlet seat;

[0012] The wear-resistant seal sleeve is mounted on the main shaft of the cutting arm and corresponds to the floating placement area between the front cover and the rear cover;

[0013] The floating water inlet seat is sleeved on the wear-resistant sleeve in a clearance-fitting manner through a wear-resistant guide belt, and the floating water inlet seat and the wear-resistant sleeve are capable of relative rotation;

[0014] A corresponding rotating water seal is provided between the floating water inlet seat and the wear-resistant sleeve;

[0015] The two end surfaces of the floating water inlet seat are elastically abutted against the end cover and the rear end cover respectively through elastic floating support components, and can freely swim along the surfaces of the end cover and the rear end cover;

[0016] The limiting bolts are sequentially passed through the front end cover, the floating water inlet seat and the rear end cover to limit the rotation of the floating water inlet seat without restricting the free floating of the floating water inlet seat.

[0017] Furthermore, the elastic floating support assembly includes an O-ring and a slip ring, and the O-ring is placed in the slip ring.

[0018] Furthermore, two groups of wear-resistant guide belts are provided between the floating water inlet seat and the wear-resistant sleeve, and the two groups of wear-resistant guide belts form a constant gap between the floating water inlet seat and the wear-resistant sleeve.

[0019] Furthermore, the wear-resistant guide belt supports the wear-resistant sleeve, so that the wear-resistant sleeve and the main shaft of the cutting arm are coaxially distributed.

[0020] Furthermore, one end of the flexible water inlet pipe is connected to the water channel outlet built into the cutting arm, and is distributed along the floating water inlet seat to the floating water inlet seat water inlet joint.

[0021] The solution provided by the present invention can completely eliminate the influence of bearing clearance and accumulated machining errors on the clearance of the rotating water sealing surface.

[0022] The solution provided by the present invention can effectively avoid mutual wear between the water inlet seat and the main shaft wear-resistant sleeve, or excessive eccentricity that exceeds the elastic range of the rotating water seal and causes water leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a structural example diagram of a cantilever longitudinal axis roadheader cutting head in an example of the present invention;

[0025] Figure 2 This is an enlarged structural example diagram of the full-floating internal spray water seal structure in an example of the present invention;

[0026] Figure 3 This is an enlarged example diagram of the matching structure of the floating water inlet seat and the limiting bolt in an example of the present invention;

[0027] Figure 4 This is an example diagram of the placement of the flexible water inlet pipe in an example of the present invention. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0029] In response to the problems existing in the water sealing structure of the spray water channel inside the cutting head of the existing cantilever longitudinal axis tunnel boring machine, this example provides a fully floating internal spray water sealing structure based on the structural characteristics of the spray water channel inside the cutting head of the cantilever longitudinal axis tunnel boring machine. The structure can completely eliminate the influence of bearing clearance and accumulated machining errors on the sealing surface gap of the rotating water seal; at the same time, it can also effectively avoid the mutual wear between the water inlet seat and the main shaft wear-resistant sleeve, or the excessive eccentricity that exceeds the elastic range of the rotating water seal and causes water leakage.

[0030] See also Figure 1 , which shows an application structure example of the full-floating internal spray water seal structure given in this example.

[0031] As can be seen from the figure, the fully floating internal spray water sealing structure 100 is specifically arranged in the cutting head of the cantilever longitudinal axis roadheader.

[0032] The cantilever longitudinal axis roadheader cutting head is mainly composed of a roadheader cutting arm 10, a cutting arm main bearing 20, a cutting arm main shaft 30, and a cutting head 40 that cooperate with each other.

[0033] The cutting arm main shaft 30 is placed in the cutting arm 10 of the tunnel boring machine through the corresponding cutting arm main bearing 20 , and the cutting head 40 is covered on the cutting arm 10 of the tunnel boring machine and is connected to the cutting arm main shaft 30 .

[0034] A corresponding water channel 11 is formed in the cutting arm 10 of the roadheader.

[0035] On this basis, the fully floating internal spray water sealing structure 100 given in this example is arranged between the cutting head 40 and the cutting arm 10 of the tunnel boring machine to introduce water in the water channel 11 built into the cutting arm 10 of the tunnel boring machine into the cutting arm main shaft 30.

[0036] Further integration Figure 2 As shown, the fully floating internal spray water seal structure 100 in this example mainly includes a front cover 110, a rear cover 120, a flexible water inlet pipe 130, an elastic floating support assembly 140, a limit bolt 150, a wear-resistant sleeve 160, a wear-resistant guide belt 170, a rotating water seal 180 and a floating water inlet seat 190.

[0037] The front end cover 110 and the rear end cover 120 are correspondingly arranged between the cutting head 40 and the cutting arm 10 of the tunnel boring machine, respectively abutting against the cutting head 40 and the cutting arm 10 of the tunnel boring machine, and forming a floating placement area therebetween.

[0038] The front end cover 110 and the rear end cover 120 configured in this way can provide support for the floating water inlet seat 190 during installation, while also serving as the front end cover of the cutting arm of the tunnel boring machine.

[0039] The specific structural forms of the front cover 110 and the rear cover 120 are not limited here and can be determined according to actual needs.

[0040] On this basis, the wear-resistant sleeve 160 of this structure is sealedly mounted on the cutting arm main shaft 30, corresponding to the floating mounting area between the front cover 110 and the rear cover 120. The wear-resistant sleeve 160 thus arranged replaces the cutting arm main shaft 30 and cooperates with the rotating water seal 180 to prevent the rotating water seal 180 from directly contacting the cutting arm main shaft 30 and wearing the main shaft.

[0041] Specifically, the wear-resistant sleeve 160 cooperates with the cutting arm main shaft 30 through multiple groups of sealing rings 161.

[0042] The floating water inlet seat 190 in this structure is annular in shape as a whole, with a corresponding water channel provided inside it, and a corresponding floating water inlet seat water inlet joint 191 (such as Figure 1 shown).

[0043] The floating water inlet seat 190 of such a structure is sleeved on the wear-resistant sleeve 160 in a clearance fit manner, so as to maintain a coaxial distribution with the cutting arm main shaft 30 and provide an optimal working environment for the rotary water seal.

[0044] The floating water inlet seat 190 and the wear-resistant sleeve 160 are not in direct contact with each other, and there is a gap between them, so that the floating water inlet seat 190 and the wear-resistant sleeve 160 can rotate relative to each other.

[0045] On this basis, in this structure, a corresponding rotating water seal 180 is provided between the floating water inlet seat 190 and the wear-resistant sleeve 160 to form a sealing structure therebetween to seal water.

[0046] Specifically, two groups of rotating water seals 180 are used here. The two groups of rotating water seals 180 are distributed on both sides of the water channel connected to the cutting arm main shaft 30, thereby realizing a sealing structure to seal water.

[0047] The specific composition structure of the rotary water seal 180 is not limited here and can be determined according to actual needs.

[0048] When the floating water inlet seat 190 configured in this way cooperates with the end cover 110 and the rear end cover 120, the front and rear end surfaces of the floating water inlet seat 190 are elastically abutted against the end cover 110 and the rear end cover 120 respectively through the elastic floating support assembly 140, and the elastic floating support assembly 140 supports the two end surfaces of the floating water inlet seat 190, and allows the floating water inlet seat 190 to freely swim along the surface of the end cover 110 and the rear end cover 120 through the corresponding elastic floating support assembly 140.

[0049] On the basis of the above solution, this structure further adopts a limiting bolt 150 to connect the front cover 110, the floating water inlet seat 190 and the rear cover 120, thereby directional limiting the movement state of the floating water inlet seat 190.

[0050] Specifically, the limiting bolt 150 passes through the front cover 110 and the floating water inlet seat 190 in sequence and is connected to the rear cover 120. The limiting bolt 150 only limits the rotation of the floating water inlet seat and does not restrict the free floating of the floating water inlet seat.

[0051] The limiting bolt 150 thus provided can effectively prevent the floating water inlet seat 190 from rotating along with the cutting arm main shaft 30 , and will not restrict the free floating of the floating water inlet seat 190 .

[0052] The flexible water inlet pipe 130 in this structure is arranged between the floating water inlet seat 190 and the tunnel boring machine cutting arm 10, one end of which is connected to the floating water inlet seat water inlet joint 191 on the floating water inlet seat 190, and the other end is connected to the outlet of the built-in water channel 11 of the tunnel boring machine cutting arm 10.

[0053] The flexible water inlet pipe 130 arranged in this way realizes the communication between the built-in water channel in the floating water inlet seat 190 and the built-in water channel in the cutting arm 10 of the tunnel boring machine. While water is passing, the flexible deformation of the flexible water inlet pipe 130 will not limit the free floating of the floating water inlet seat 190.

[0054] In some embodiments of this example, the floating water inlet seat 190 is achieved by limiting the rotation of the floating water inlet seat 190 while ensuring that the floating water inlet seat 190 has sufficient degrees of freedom through an elastic floating support assembly 140 set between the front cover 110 and the rear cover 120, and corresponding limiting holes are set in the floating water inlet seat 190 to cooperate with the limiting bolts 150.

[0055] Specifically, the elastic floating support assembly 140 forms end surface support for the floating water inlet seat 190 and drives the floating water inlet seat 190 to swim freely on the surfaces of the front end cover 110 and the rear end cover 120 .

[0056] See also Figure 2 The elastic floating support assembly 140 here is mainly composed of an O-ring 141 and a slip ring 142.

[0057] The O-ring 141 is placed in the slip ring 142 , and the O-ring provides elastic support, while the slip ring 142 is slidably abutted against the outside.

[0058] In conjunction with this, corresponding mounting grooves are set on the two end faces of the floating water inlet seat 190, and the elastic floating support assembly 140 formed is embedded in the mounting groove as a whole, wherein the O-ring 141 is located between the bottom of the mounting groove and the slip ring 142, and can exert elastic support force to the outside to push the slip ring 142 to abut against the surfaces of the front cover 110 and the rear cover 120.

[0059] In this way, the elastic support formed between the two end faces of the floating water inlet seat 190 and the surfaces of the front end cover 110 and the rear end cover 120 based on the elastic floating support component 140, so that a gap is formed between the floating water inlet seat 190 and the surfaces of the front end cover 110 and the rear end cover 120, and they are not directly fitted, but rely on the elastic floating support component 140 for support; thereby, the floating water inlet seat 190 can freely swim on the surfaces of the front end cover 110 and the rear end cover 120 based on the slip ring 142 in the elastic floating support component 140.

[0060] See further Figure 3 When the floating water inlet seat 190 is matched with the limiting bolt 150, a corresponding limiting hole 192 is provided inside it. The limiting hole 192 is opened along the radial direction of the floating water inlet seat 190. The opening size along the radial direction of the floating water inlet seat 190 is larger than the diameter of the limiting bolt, while the opening size along the circumference of the floating water inlet seat 190 is matched with the diameter of the limiting bolt.

[0061] The specific size of the opening of the limiting hole 192 along the radial direction of the floating water inlet seat 190 is not limited here and can be determined according to actual needs as long as it can meet the floating stroke of the floating water inlet seat 190.

[0062] The limiting hole 192 set up in this way can allow the limiting bolt 150 to pass through. Since the opening size of the limiting hole 192 along the circumference of the floating water inlet seat 190 is just matched with the diameter of the limiting bolt 150, the limiting bolt 150 will limit the rotation of the floating water inlet seat 190, effectively preventing the floating water inlet seat 190 from rotating synchronously with the cutting arm main shaft 30; at the same time, since the opening size of the limiting hole 192 along the radial direction of the floating water inlet seat 190 is larger than the diameter of the limiting bolt 150, the limiting bolt 150 will not limit the radial movement of the floating water inlet seat 190, so that the limiting bolt 150 will not restrict the synchronous floating of the water inlet seat and the cutting arm main shaft 30, especially the floating in the diameter direction.

[0063] In some embodiments of this example, a corresponding wear-resistant guide belt 170 is added between the floating water inlet seat 190 and the wear-resistant sleeve 160 to ensure the clearance fit between the floating water inlet seat 190 and the wear-resistant sleeve 160, and the floating water inlet seat 190 and the wear-resistant sleeve 160 and the cutting arm main shaft 30 are always coaxial, thereby ensuring that the rotary water seal works in the best state.

[0064] See also Figure 2 and Figure 4 In this example, corresponding placement grooves are provided on the inner walls of the floating water inlet seat 190 and the wear-resistant sleeve 160, and corresponding wear-resistant guide strips 170 are placed in the placement grooves.

[0065] The wear-resistant guide belt 170 is mounted on the wear-resistant sleeve 160 on the floating water inlet seat 190, and will abut against the outer side surface of the wear-resistant sleeve 160 to provide certain support for the floating water inlet seat 190, so that there is no direct contact between the floating water inlet seat 190 and the wear-resistant sleeve 160, and there is a certain gap 193, while allowing the floating water inlet seat and the wear-resistant sleeve to rotate relative to each other.

[0066] Since the floating water inlet seat 190 and the wear-resistant sleeve 160 are supported by the wear-resistant guide belt 170 to form a gap, this can ensure that the size of the gap 193 between the floating water inlet seat 190 and the wear-resistant sleeve 160 is constant, thereby ensuring that the floating water inlet seat 190 and the wear-resistant sleeve 160 and the cutting arm main shaft 30 are always coaxially distributed.

[0067] Preferably, the wear-resistant guide belt 170 is generally made of a non-metallic material that is not easily deformed and wear-resistant, and has a uniform thickness, so as to ensure a constant gap between the floating water inlet seat and the wear-resistant sleeve.

[0068] Furthermore, during the specific assembly, two sets of wear-resistant guide belts are set between the floating water inlet seat 190 and the wear-resistant sleeve 160 to ensure the constant gap 193 between the floating water inlet seat 190 and the wear-resistant sleeve 160 and the stable and reliable coaxial distribution.

[0069] In some embodiments of this example, see Figure 1 and Figure 4 , because the gap between the waterway outlet on the cutting arm 10 of the tunnel boring machine and the water inlet on the floating water inlet seat 190 (that is, the floating water inlet seat water inlet joint 191 provided) is half a circumferential distance of the floating water inlet seat 190.

[0070] To this end, a corresponding water trough mounting groove is provided on the side wall of the floating water inlet seat 190. When the flexible water inlet pipe 130 is installed, one end of the flexible water inlet pipe 130 is connected to the outlet of the internal water channel 11 of the cutting arm 10 of the tunnel boring machine. The flexible water inlet pipe 130 is placed in the water trough mounting groove on the floating water inlet seat 190 and extends along the water trough mounting groove to the floating water inlet seat water inlet joint 191 on the floating water inlet seat 190. The other end of the flexible water inlet pipe 130 is directly connected to the floating water inlet seat water inlet joint 191. In this way, the flexible water inlet pipe 130 is entirely attached to the outer wall of the floating water inlet seat 190. Due to its inherent flexibility, it can deform and will not restrict the free floating of the floating water inlet seat.

[0071] In the fully floating internal spray water seal structure 100 thus constructed, the floating water inlet seat 190 has no rigid connection with other non-rotating parts such as the shell and the pressure cover, and there is no constraint in the diameter direction; at the same time, the floating water inlet seat and the wear-resistant sleeve are supported by a guide belt to maintain a constant gap, thereby completely eliminating the influence of bearing clearance and accumulated machining errors on the gap of the rotating water seal surface.

[0072] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Fully floating internal spray water seal structure, characterized by: It includes a front cover, a rear cover, a flexible water inlet pipe, an elastic floating support assembly, a limit bolt, a wear-resistant sleeve, a wear-resistant guide belt, a rotating water seal and a floating water inlet seat; The front cover and the rear cover are correspondingly arranged between the cutting head and the cutting arm of the tunnel boring machine, and a floating placement area is formed between the two; The flexible water inlet pipe is connected to the waterway outlet built into the cutting arm and the water inlet joint of the floating water inlet seat; The wear-resistant sleeve is sealingly sleeved on the main shaft of the cutting arm and corresponds to the floating placement area between the front cover and the rear cover; The floating water inlet seat is sleeved on the wear-resistant sleeve in a clearance-fitting manner through a wear-resistant guide belt, and the floating water inlet seat and the wear-resistant sleeve are capable of relative rotation; A corresponding rotating water seal is provided between the floating water inlet seat and the wear-resistant sleeve; The two end surfaces of the floating water inlet seat are elastically abutted against the front cover and the rear cover through elastic floating support components, and can freely swim along the surfaces of the front cover and the rear cover; The limiting bolts are sequentially passed through the front end cover, the floating water inlet seat and the rear end cover to limit the rotation of the floating water inlet seat without restricting the free floating of the floating water inlet seat.

2. The fully floating internal spray water sealing structure according to claim 1, characterized in that: The elastic floating support assembly is composed of an O-ring and a slip ring, and the O-ring is placed in the slip ring.

3. The fully floating internal spray water sealing structure according to claim 1, characterized in that: Two groups of wear-resistant guide belts are arranged between the floating water inlet seat and the wear-resistant sleeve, and the two groups of wear-resistant guide belts form a constant gap between the floating water inlet seat and the wear-resistant sleeve.

4. The fully floating internal spray water sealing structure according to claim 1, characterized in that: The wear-resistant guide belt supports the wear-resistant sleeve so that the wear-resistant sleeve is coaxially distributed with the main shaft of the cutting arm.

5. The fully floating internal spray water sealing structure according to claim 1, characterized in that: One end of the flexible water inlet pipe is connected to the outlet of the built-in water channel of the cutting arm, and is distributed along the floating water inlet seat to the water inlet joint of the floating water inlet seat.

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