CN106272068B

CN106272068B - Middle cylinder inner cavity fine grinding supporting device and fine grinding method

Info

Publication number: CN106272068B
Application number: CN201610952213.3A
Authority: CN
Inventors: 陶国良
Original assignee: Anhui Antong Intelligent Equipment Manufacturing Co ltd
Current assignee: Anhui Antong Intelligent Equipment Manufacturing Co ltd
Priority date: 2016-10-27
Filing date: 2016-10-27
Publication date: 2020-07-03
Anticipated expiration: 2036-10-27
Also published as: CN108081128A; CN108081128B; CN106272068A

Abstract

The invention discloses a middle cylinder inner cavity fine grinding supporting device and a fine grinding method, and belongs to the field of processing of breaking hammers. The invention discloses a middle cylinder inner cavity fine grinding supporting device which comprises a base, a supporting table and a disc, wherein the supporting table is arranged on the base; the upper surface of the base is obliquely arranged, the supporting table is fixed on the base, the bottom surface of the supporting table is matched with the upper surface of the base, and the two disc brackets arranged on the supporting table are symmetrical about a vertical middle section; a supporting head is arranged in the disc bracket, an inner hole of the disc is used for sleeving the neck of the cylinder body, and the outer wall of the disc is supported by the supporting head. Adopt this strutting arrangement to carry out auxiliary stay, utilize the grinding machine to carry out abrasive machining, only need a process, need not overturn, simplified the process, add the influence of the eccentric inertia that has avoided well cylinder body self weight to arouse moreover man-hour, improved the machining precision greatly.

Description

Middle cylinder inner cavity fine grinding supporting device and fine grinding method

Technical Field

The invention relates to the technical field of breaking hammer processing, in particular to a middle cylinder inner cavity fine grinding supporting device and a fine grinding method.

Background

The breaking hammer is an important engineering machine which uses hydraulic energy as power to drive a piston positioned in an upper cylinder body of a hydraulic cylinder to do reciprocating motion, a drill rod is hammered by the piston to transmit energy to the drill rod, and the energy on the drill rod is absorbed by a struck object, so that the struck object is broken, the breaking hammer is mainly used for the work of breaking, dismantling, hard layer excavation and the like in building construction, is usually installed on an excavator, a loader or a power station, and has the advantages of large impact force, convenience in use, good maneuverability, high efficiency and the like. Along with the development of hydraulic technology, the application of the hydraulic breaking hammer in various industries of society is more and more extensive, and the hydraulic breaking hammer is developed from the initial drilling operation for mine rock engineering and the secondary breaking of large rocks to the development that the hydraulic breaking hammer is used for excavating tunnels, dismantling roads and bridges and buildings, breaking asphalt and concrete pavements, removing smelting slag, performing underwater operation and the like at present, and is more and more paid attention to mines and construction departments due to the flexibility of the work and the effect of the hydraulic breaking hammer on improving the labor productivity, so that the hydraulic breaking hammer has wide application prospect and huge market demand.

The main function of the cylinder body in the breaking hammer is realized by the matching of a piston hole and a valve hole, as shown in figure 1, the piston hole is an inner cavity of the middle cylinder body, and the middle cylinder body is provided with the valve hole and must have an offset part, so that the piston hole is not actually positioned in the central part of the middle cylinder body with a rectangular structure.

The piston hole is great for valve opening size, leads to the focus to the skew of valve opening place side, and when carrying out abrasive machining to the piston hole, its inertia is uneven, in order to guarantee the machining precision, needs to overturn the cylinder body after its one end processing, processes from the opposite side, leads to manufacturing procedure loaded down with trivial details, has increased machining error simultaneously.

Chinese patent No.: ZL201520393683.1, date of authorized bulletin: 11, month and 25 in 2015, the invention is named as: the application discloses a clamping device for polishing a valve core hole of a middle cylinder body, which comprises an installation block, a fixed block, a balancing weight, a positioning block and a fixed rod, wherein the installation block is provided with an installation hole, a positioning pin hole and a through hole; the fixed block is provided with a positioning pin and a round hole for accommodating a cylinder opening of the middle cylinder body, the positioning pin is inserted into the positioning pin hole, the end face of the fixed block is attached to the end face of the mounting block, and the axis of the round hole is superposed with the axis of the mounting hole; the balancing weight is arranged on the end surface of the mounting block; and the positioning block is provided with a grinding wheel inlet hole and a rod through hole, and the axis of the grinding wheel inlet hole is superposed with the axis of the mounting hole.

Although the device carries out counter weight balance, it is better to cylinder body processing effect in small-size, in case well cylinder body weight is on the large side, and the eccentric inertia of rotation is comparatively obvious, and the grinding volume deviation is great, need send the cylinder body can guarantee the axiality, consequently, still has great difficult point to the hole abrasive machining of large-scale well cylinder body.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the defect that the inner cavity of a large-sized middle cylinder body is not easy to fix during processing in the prior art, and provides a middle cylinder body inner cavity fine grinding supporting device and a fine grinding method; the processing method can effectively prevent the middle cylinder body from shaking, reduces processing errors and improves processing precision.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the invention discloses a middle cylinder inner cavity fine grinding supporting device which comprises a base, a supporting table and a disc, wherein the supporting table is arranged on the base; the upper surface of the base is obliquely arranged, the supporting table is fixed on the base, the bottom surface of the supporting table is matched with the upper surface of the base, and the two disc brackets arranged on the supporting table are symmetrical about a vertical middle section; a supporting head is arranged in the disc bracket, an inner hole of the disc is used for sleeving the neck of the cylinder body, and the outer wall of the disc is supported by the supporting head.

As a further improvement of the invention, the bottom of the supporting platform is a supporting platform seat, a ridge beam plate is arranged on the supporting platform seat, and the disc bracket is fixed on the ridge beam plate.

As a further improvement of the invention, the disc bracket further comprises a bracket outer cylinder, a support shaft is sleeved in the bracket outer cylinder, and the support head is fixed at the end part of the support shaft; the bracket outer cylinder is provided with a threaded hole, a locking bolt is connected in the threaded hole, and the support shaft is locked through the locking bolt.

As a further improvement of the invention, the upper surface of the base mainly comprises a first inclined plane section, a concave arc section and a second inclined plane section, wherein the first inclined plane section and the second inclined plane section are positioned on the same plane, and the concave arc section is positioned between the first inclined plane section and the second inclined plane section.

As a further improvement of the invention, a first step opening is arranged at the high end of the base, and a clamping surface is arranged on the end surface of the low end of the base; the bottom of the supporting platform is provided with a supporting pedestal, one end of the supporting pedestal is provided with a bayonet, and the bayonet is matched with the first port; the other end of the supporting pedestal is provided with a fastening chuck, and a lower baffle of the fastening chuck is abutted against the clamping surface through a bolt, so that the supporting platform is fixed on the base.

As a further improvement of the invention, the support pedestal mainly comprises a first seat plate and a second seat plate, the second seat plate is positioned at the end part of the first seat plate and forms a bayonet with the first seat plate, the included angle of the bayonet is α, the clamp between the vertical section of the first stage and the upper surface of the base is α, and the included angle α ranges from 78 degrees to 85 degrees.

As a further improvement of the invention, a bolt pulling plate is fixed on the support pedestal, a bolt hole is vertically formed in the bolt pulling plate, a fastening bolt is installed in the bolt hole, the outer end of the fastening bolt is connected with the fastening chuck, and the fastening chuck is locked by the fastening bolt.

As a further improvement of the invention, the fastening chuck is a semi-open structure surrounded by an upper baffle, a middle connecting plate and a lower baffle, the fastening bolt is connected with the middle connecting plate, the upper baffle is used for abutting against a ridge beam plate on the supporting pedestal, and the lower baffle is used for abutting against the clamping surface.

In a further improvement of the present invention, the engaging surface is an inclined surface, the lower side of which is inclined inward, and the bayonet surface of the lower baffle plate and the engaging surface are inclined in the same direction.

The invention discloses a middle cylinder inner cavity fine grinding processing method, which adopts a middle cylinder inner cavity fine grinding supporting device to carry out auxiliary supporting and utilizes a grinding machine to carry out fine grinding processing, and the processing steps are as follows:

step 1, hoisting a base to a grinder workbench, and fixing the base;

step 2, hoisting the support table onto a grinder workbench, clamping an included angle between the first step opening and the upper surface by the bayonet, adjusting the position of the support table on the base according to the length of the middle cylinder body, and then screwing the fastening bolt, so that the support table is fixed;

step 3, sleeving the disc on a cylinder body shaft neck, and connecting a screw rod with a grinding machine rotating chassis through screw holes in the disc and the middle cylinder body to fix the middle cylinder body;

step 4, loosening the locking bolt on the disc bracket, adjusting the supporting head to be in contact with the outer wall of the disc, and then positioning and fixing the supporting head by using the locking bolt to form auxiliary support;

and 5, adjusting a grinding head cutter according to the feeding amount, and starting grinding until finishing finish grinding.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) the middle cylinder inner cavity fine grinding supporting device is formed by combining the base, the supporting table and the disc, and on one hand, the device can play a supporting role, prevent processing deformation and ensure grinding precision; on the other hand, the cylinder body can be adjusted according to the size of the cylinder body, and is suitable for processing the cylinder bodies in various specifications;

(2) according to the middle cylinder inner cavity fine grinding supporting device, the joint of the base and the supporting table is provided with the inclined plane, automatic positioning can be performed by means of the gravity of the supporting table, the supporting table can be effectively prevented from shaking left and right, and the stability is better; the fastening chuck is fastened through a single bolt, so that the dismounting is convenient; in addition, the matching part of the bayonet surface and the clamping surface on the fastening chuck is an inclined surface to form an inner buckling type clamping, so that a certain self-locking effect is achieved, and the stability is further improved;

(3) according to the middle cylinder inner cavity fine grinding supporting device, the middle cylinder body and the supporting head are connected through the disc, the disc is fixed on the middle cylinder body through the screw, the outer wall of the disc is in contact with the supporting head during machining, abrasion to the neck of the middle cylinder body is avoided, the disc can be replaced according to the size of the neck of the middle cylinder body, and the application range is wider;

(4) according to the method for accurately grinding the inner cavity of the middle cylinder body, the supporting device is adopted to support the outer end of the middle cylinder body, so that the influence of the gravity of the middle cylinder body on the machining is overcome, the deformation factor is reduced, the coaxiality of the center hole of the inner cavity after accurate grinding is ensured, and the machining precision is improved; need not to center the cylinder body and overturn during processing, a clamping alright accomplish whole processing, retrencied manufacturing procedure, reduced the unnecessary error, had great improvement to the machining precision.

Drawings

FIG. 1 is a schematic structural diagram of a cylinder body in processing;

FIG. 2 is a schematic structural diagram of the middle cylinder inner cavity fine grinding support device of the invention;

FIG. 3 is a schematic view of the construction of the disc carrier of the present invention;

FIG. 4 is a schematic structural view of a base in the present invention;

FIG. 5 is a schematic front view of the base of the present invention;

FIG. 6 is a schematic view of a support stage according to the present invention;

fig. 7 is a schematic structural view of a fastening chuck in the present invention;

fig. 8 is a schematic view of the structure of the disc of the present invention.

The reference numerals in the schematic drawings illustrate: 1. a base; 11. a first step opening; 12. a section of inclined plane; 13. a concave arc section; 14. a second inclined plane section; 15. a second step opening; 16. a clamping surface; 17. mounting a screw hole; 2. a support table; 21. a support pedestal; 211. a first seat plate; 212. a second seat plate; 22. fastening the chuck; 221. an upper baffle plate; 222. a lower baffle plate; 223. a bayonet surface; 23. a disc holder; 231. a bracket outer cylinder; 232. a support head; 233. locking the bolt; 24. a spine panel; 241. a longitudinal spine panel; 242. a transverse spine panel; 25. pulling a plate by using a bolt; 26. fastening a bolt; 3. a disc; 4. a middle cylinder body; 41. a cylinder journal.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Example 1

Referring to fig. 1, the large-sized middle cylinder 4 has a conventional structure, and is easy to swing during rotation because the main structure is rectangular. More importantly, during the fine grinding process, the cutter feeding process is required to be carried out from one side of the middle cylinder body 4, so that the fixing can be carried out from one end only; however, the middle cylinder 4 has a large weight and is inevitably deformed, so that the grinding amount is difficult to control.

In the embodiment, the middle cylinder inner cavity fine grinding support device can be used for supporting the middle cylinder 4 from the other end, namely, supporting the cylinder journal 41, so as to improve the processing precision. Specifically, with reference to fig. 2 and 8, the apparatus comprises a base 1, a support table 2 and a disc 3; the base 1 is provided with an installation screw hole 17, and a bolt is inserted into the installation screw hole 17, so that the base 1 can be fixed on a grinding machine workbench. In this embodiment, the supporting table 2 is fixed on the base 1, the disc bracket 23 is disposed on the supporting table 2, the disc 3 can be supported by the disc bracket 23, the disc 3 can rotate on the supporting table 2, and the cylinder journal 41 is supported by the disc 3.

Referring to fig. 3, in the present embodiment, the supporting platform 2 is fixed on the base 1, the bottom surface of the supporting platform 2 is matched with the upper surface of the base 1, and after the supporting platform 2 is installed in a matching manner, two disc brackets 23 arranged on the supporting platform 2 are symmetrical with respect to a vertical middle section; a supporting head 232 is provided in the disc bracket 23, the inner hole of the disc 3 is used for sleeving the neck of the cylinder 4, and the outer wall of the disc 3 is supported by the supporting head 232.

The disc bracket 23 further comprises a bracket outer barrel 231, a support shaft is sleeved in the bracket outer barrel 231, and a support head 232 is fixed at the end part of the support shaft; the bracket outer cylinder 231 is provided with a screw hole, a lock bolt 233 is connected to the screw hole, and the support shaft is locked by the lock bolt 233.

It should be noted that the supporting head 232 mainly functions to support the disc 3 and ensure that the disc can perform a rotation motion, and therefore, a rotation shaft or a ball may be disposed on the supporting head 232, or a fixed fulcrum may be disposed on the supporting head 232, that is, the supporting head 232 is in non-rolling contact with the outer wall of the disc. Because the main weight of the middle cylinder body 4 is fixed by the screw, the arranged disc 3 mainly plays a role of auxiliary support and prevents micro deformation in the processing process. The rotating performance of the rotating shaft and the ball has less friction relative to the fixed pivot point and better flexibility, but the rotating shaft and the ball are easier to generate a gap relative to the fixed pivot point, and the improvement of the precision is poorer relative to the fixed pivot point. The support head 232 in this embodiment is cylindrical with rounded corners at its ends.

Referring to fig. 4 and 5, the upper surface of the base 1 in this embodiment is inclined, and the upper surface mainly includes a first inclined surface section 12, a concave arc section 13, and a second inclined surface section 14, where the first inclined surface section 12 and the second inclined surface section 14 are located on the same plane, and the concave arc section 13 is located between the first inclined surface section 12 and the second inclined surface section 14. The concave arc section 13 can reduce the weight of the base 1, in addition, the concave arc section 13 divides the upper surface into two inclined surface sections, the larger the plane is, the higher the requirement on the flatness of the processing surface is, and if dust enters, the influence on the whole flatness is larger; after the concave arc section is arranged, the contact surface is greatly reduced, so that the first inclined plane section 12 and the second inclined plane section 14 can be better attached to the matching surface, and the fixing stability is improved.

Furthermore, according to the height of the upper surface of the base 1, the end far away from the bottom surface of the base 1 is a high end, the high end of the base 1 is provided with a first step 11, the side edge of the first step 11 is vertically arranged, an included angle α is formed between the side edge and a section 12 of the inclined surface, the end surface of the low end of the base 1 is provided with a clamping surface 16, in combination with fig. 6, the bottom of the supporting platform 2 is a supporting platform base 21, one end of the supporting platform base 21 is provided with a bayonet, the bayonet is matched with the first step 11, the bayonet clamps the included angle formed between the side edge of the first step 11 and the inclined surface, so that the supporting platform 2 cannot slide off from the upper surface of the base 1, the supporting platform base 21 is provided with a ridge beam plate.

Since the support base 2 needs to be fixed from both ends, the other end of the support base 21 is provided with the fastening chuck 22, and the lower stopper 222 of the fastening chuck 22 is pressed against the engaging surface 16 by a bolt, so that the support base 2 is fixed to the base 1 and cannot move relative to the base 1.

In addition, in order to make support pedestal 21 fully contact with base 1, improve fastening dop 22's fixed effect, be provided with second step 15 at base 1 low point end, the edge that the setting up of second step 15 made support pedestal 21 does not support, when fastening dop 22 application of force, has certain micro-deformation space, and fastening force is stronger.

The traditional large-sized middle cylinder body processing needs two procedures to finish grinding processing, and the device can form auxiliary support for the middle cylinder body, thereby effectively avoiding the problem of eccentric swing of the middle cylinder body during processing and greatly improving the processing precision; in addition, the supporting device is formed by combining the base, the supporting table and the disc, so that middle cylinders with different lengths and different shaft necks can be supported by the device, and the device is convenient to adjust and use and wide in application range.

Example 2

The basic structure of the middle cylinder inner cavity fine grinding supporting device of the embodiment is the same as that of the embodiment 1, furthermore, as shown in fig. 7, the supporting seat 21 of the embodiment mainly comprises a first seat plate 211 and a second seat plate 212, the first seat plate 211 forms a base plate of the supporting seat 21, the second seat plate 212 corresponds to a stop, the second seat plate 212 is arranged at the end of the first seat plate 211 and forms the bayonet with the first seat plate 211, the included angle of the bayonet is α, the clamp between the vertical section of the first step 11 and the upper surface of the base 1 is α, the included angle α ranges from 78 to 85 degrees, and the included angle of the first step 11 and the second step is 82 degrees.

If the included angle α is too small, the inclination angle of the upper surface of the base 1 is too large, the force distributed to the vertical direction by the base 1 is small, the disc bracket 23 is not easy to mount, if the included angle α is too large or a 90-degree included angle is adopted, the upper surface of the base 1 is close to the horizontal position, the bayonet and the first step 11 cannot be stably matched, and at the moment, the one-side fastening is adopted, so that the looseness is easily caused.

Example 3

The basic structure of a middle cylinder inner cavity fine grinding supporting device of the embodiment is the same as that of the embodiment 2, and further: the spine board 24 in this embodiment is mainly composed of a longitudinal spine board 241 and a transverse spine board 242, the longitudinal spine board 241 and the transverse spine board 242 are perpendicular to each other, and the inner side of the longitudinal spine board 241 is set in an arc shape to avoid interference with the disc 3.

The support pedestal 21 is further fixed with a bolt pulling plate 25, the bolt pulling plate 25 is parallel to the transverse ridge beam plate 242, bolt holes are vertically formed in the transverse ridge beam plate 242 and the bolt pulling plate 25, namely bolt holes are formed along the length direction of the support pedestal 21, a fastening bolt 26 is installed in each bolt hole, the outer end of each fastening bolt 26 is connected with the fastening chuck 22, the protruding part at the lower end of each fastening chuck 22 can be attached to the clamping surface 16, the fastening chuck 22 is locked through the fastening bolt 26, and therefore the support pedestal 21 is fixed.

Example 4

The basic structure of the middle cylinder inner cavity fine grinding supporting device of the embodiment is the same as that of the embodiment 3, and further: the fastening chuck 22 is a half-open structure surrounded by an upper baffle 221, a middle connecting plate and a lower baffle 222, i.e. only one side is open; the fastening bolt 26 is connected to the middle connecting plate, either fixedly or movably, and the main purpose of the fastening bolt 26 is to tighten the fastening chuck 22 to achieve axial movement of the fastening bolt.

The upper baffle 221 is provided to abut against the lateral ridge plate 242 on the support base 21, and as a fulcrum, when the fastening bolt 26 is tightened, the lower baffle 222 abuts against the engagement surface 16, and the engagement between the two is achieved.

It should be noted that, if the engaging surface is a vertical surface, when the lower baffle 222 swings around the pivot of the upper baffle 221, only the edge can contact with the engaging surface 16, and the lower baffle cannot be effectively fixed, and is easy to loosen during use; in the present embodiment, the engaging surface 16 is formed as an inclined surface, the lower side thereof is inclined inward and recessed inward, and the bayonet surface 223 of the lower flap 222 and the engaging surface 16 are inclined in the same direction. The two form an inner buckle type clamping, and have a certain self-locking effect.

Example 5

The invention discloses a middle cylinder inner cavity fine grinding processing method, which adopts a middle cylinder inner cavity fine grinding supporting device in the embodiment to carry out auxiliary supporting and utilizes a grinding machine to carry out processing, and the processing steps are as follows:

step 1, hoisting a base 1 onto a grinder workbench, screwing a screw into an installation screw hole 17, and fixing the base 1 on the workbench;

step 2, hoisting the support table 2 onto a grinder workbench, clamping an included angle between the first step 11 and the upper surface by a bayonet, enabling the support table 2 to automatically slide downwards under the action of gravity, adjusting the position of the support table 2 on the base 1 according to the length of the middle cylinder body 4, then screwing the fastening bolt 26, fastening the bayonet surface 223 on the fastening chuck 22 and the clamping surface 16, and fixing the support table 2;

step 3, sleeving the disc 3 on the cylinder body shaft neck 41, and connecting a screw rod with a rotary chassis of the grinding machine through screw holes in the disc 3 and the middle cylinder body 4 to fix the middle cylinder body 4;

step 4, loosening the locking bolt 233 on the disc bracket 23, adjusting the supporting head 232 to contact with the outer wall of the disc 3, and then positioning and fixing the supporting head 232 by using the locking bolt 233 to form auxiliary support;

step 5, adjusting a grinding head cutter according to the feeding amount, and starting grinding; the middle cylinder body 4 does not need to be turned during grinding, and the inner cavity is machined in one process.

The traditional method needs to turn over the middle cylinder body after one-time processing and then grind the other side, the processing method needs two times of calibration and has enlarged processing error, but only one procedure is needed in the invention, turning is not needed, the procedure is simplified, the influence of eccentric inertia caused by the self weight of the middle cylinder body on processing is avoided during processing, and the processing precision is greatly improved.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims

1. The utility model provides a well cylinder inner chamber correct grinding strutting arrangement which characterized in that: comprises a base (1), a supporting platform (2) and a disc (3); the upper surface of the base (1) is obliquely arranged, the supporting table (2) is fixed on the base (1), the bottom surface of the supporting table (2) is matched with the upper surface of the base (1), and two disc brackets (23) arranged on the supporting table (2) are symmetrical about a vertical middle section; a supporting head (232) is arranged in the disc bracket (23), an inner hole of the disc (3) is used for sleeving the neck of the middle cylinder body (4), and the outer wall of the disc (3) is supported by the supporting head (232); the bottom of the support table (2) is a support table seat (21), a ridge beam plate (24) is arranged on the support table seat (21), and the disc bracket (23) is fixed on the ridge beam plate (24); the upper surface of the base (1) mainly comprises a first inclined plane section (12), a concave arc section (13) and a second inclined plane section (14), wherein the first inclined plane section (12) and the second inclined plane section (14) are positioned on the same plane, and the concave arc section (13) is positioned between the first inclined plane section (12) and the second inclined plane section (14); a first step opening (11) is formed in the high end of the base (1), and a clamping surface (16) is formed in the end surface of the low end of the base (1); the bottom of the supporting platform (2) is a supporting pedestal (21), one end of the supporting pedestal (21) is provided with a bayonet, and the bayonet is matched with the first step (11); the other end of the support pedestal (21) is provided with a fastening chuck (22), and a lower baffle (222) of the fastening chuck (22) is abutted against the clamping surface (16) through a bolt, so that the support platform (2) is fixed on the base (1).

2. A middle cylinder bore finish grinding support device according to claim 1, wherein: the disc bracket (23) further comprises a bracket outer cylinder (231), a support shaft is sleeved in the bracket outer cylinder (231), and the support head (232) is fixed at the end part of the support shaft; the bracket outer cylinder (231) is provided with a threaded hole, a locking bolt (233) is connected in the threaded hole, and the supporting shaft is locked through the locking bolt (233).

3. A middle cylinder inner cavity fine grinding support device according to any one of claims 1-2, characterized in that the support pedestal (21) mainly comprises a first seat plate (211) and a second seat plate (212), the second seat plate (212) is arranged at the end of the first seat plate (211) and forms the bayonet with the first seat plate (211), the included angle of the bayonet is α, the included angle of the vertical section of the first step mouth (11) and the upper surface of the base (1) is also α, and the included angle of α is 78-85 degrees.

4. A middle cylinder inner cavity fine grinding supporting device according to any one of claims 1-2, characterized in that: the support pedestal is characterized in that a bolt pulling plate (25) is fixed on the support pedestal (21), a bolt hole is vertically formed in the bolt pulling plate (25), a fastening bolt (26) is installed in the bolt hole, the outer end of the fastening bolt (26) is connected with the fastening chuck (22), and the fastening chuck (22) is locked through the fastening bolt (26).

5. A middle cylinder inner cavity fine grinding supporting device according to any one of claims 1-2, characterized in that: the fastening chuck (22) is a semi-open structure surrounded by an upper baffle (221), a middle connecting plate and a lower baffle (222), a fastening bolt (26) is connected with the middle connecting plate, the upper baffle (221) is used for abutting against a ridge beam plate (24) on the supporting pedestal (21), and the lower baffle (222) is used for abutting against the clamping face (16).

6. A middle cylinder inner chamber fine grinding support device according to claim 5, characterized in that: the engaging surface (16) is an inclined surface, the lower side of the engaging surface inclines inwards, and the bayonet surface (223) of the lower baffle (222) and the engaging surface (16) incline in the same direction.