Grinding machine gearbox with good sealing effect

Abstract

Disclosed in the present invention is a grinding machine gearbox with a good sealing effect. The grinding machine gearbox with the good sealing effect comprises an upper casing and a lower casing, wherein an upper bearing sleeve is provided in the middle of the upper casing, an annular connecting boss is provided in the middle of the lower casing, and the upper bearing sleeve is rotationally connected to the annular connecting boss; the inside of the upper casing cooperates with the annular connecting boss to form an upper liquid storage cavity; and a first sealing member is provided between the upper casing and the annular connecting boss, and a second sealing member is provided between the upper bearing sleeve and the annular connecting boss. Compared with the prior art, the mounting positions of the first sealing member and the second sealing member in the gearbox of the present invention are close to the center of the gearbox, such that the radial dimensions of the first sealing member and the second sealing member can be effectively reduced, enabling the sealing members to have higher structural strength, and the sealing members are not likely to deform after a long-term operation, thereby further improving the sealing performance of an oil storage cavity and prolonging the service life of the sealing members.

Description

Grinding machine gear box with good sealing effect TECHNICAL FIELD

[0001] The present application relates to the technical field of grinding machine gear box, in particular to a grinding machine gear box with good sealing effect. BACKGROUND

[0002] The floor grinder is an automatic equipment for polishing or grinding the concrete floor, which can be widely applied to the floor construction of underground garage and industrial plant, and is an indispensable equipment in the process of epoxy floor construction, solidified floor construction and diamond floor construction. The floor grinder is mainly used for removing the floating slurry on the concrete surface (after the concrete is completely dry), so as to carry out the subsequent floor surface construction work. The floor grinder can realize the floor polishing or grinding function by replacing different machine tool bits, and has the characteristics of lightness, flexibility, high work efficiency and the like.

[0003] The patent with the patent authorization announcement No. CN117583972B discloses a box body convenient to disassemble floor grinder, which is convenient to process and assemble. The parts in the box body can be fully lubricated, and the replacement of lubricating oil is more convenient and fast. However, the above-mentioned scheme has the following problems: since the sealing element is installed on the outer side of the upper box body, the radial dimension of the sealing element is large, and deformation is prone to occur after long-time work, which causes the oil leakage phenomenon of the oil storage cavity. In the above-mentioned scheme, a sealing pressing plate needs to be installed to further press and fix the sealing element, and the installation process is relatively cumbersome.

[0004] In addition, when the lower gear box rotates relative to the rack and the upper gear box during the work of the grinder, due to the reverse force of the contact between the grinding disc and the ground, the coaxial rotation of the upper and lower gear boxes cannot be guaranteed, thereby affecting the service life and work efficiency of the machine.

[0005] Therefore, the present applicant has conducted in-depth research on the above-mentioned problems, and thus the present case is generated. TECHNICAL PROBLEM

[0006] The main purpose of the present application is to provide a grinding machine gear box with good sealing effect, which not only has good sealing property, but also can ensure the coaxiality of the upper and lower gear boxes, thereby greatly improving the working condition of the gear box. TECHNICAL SOLUTION

[0007] In order to achieve the above-mentioned purpose, the solution of the present application is:

[0008] The application discloses a grinding machine gear box with good sealing effect, which comprises an upper shell and a lower shell, a middle part of the upper shell is provided with an upper bearing sleeve, a middle part of the lower shell is provided with a connecting ring table, the upper bearing sleeve is coaxially arranged with the connecting ring table and is in relative rotation connection, the inside of the upper shell and the connecting ring table cooperatively form an upper liquid storage cavity, a first sealing element is arranged between the upper shell and the connecting ring table, and a second sealing element is arranged between the upper bearing sleeve and the connecting ring table.

[0009] Further, the upper shell comprises an upper box cover and an upper box body, the upper box cover is fixedly connected with the side wall of the upper box body, and a first embedding groove is arranged on one side of the bottom wall of the upper box body close to the connecting ring table, and the first sealing element is embedded in the first embedding groove.

[0010] Further, the upper shell is provided with an extension part extending outward, and the upper box cover is provided with a mounting seat on the extension part.

[0011] Further, the outer side wall of the upper bearing sleeve is provided with a first ring groove, a second embedding groove is formed between the first ring groove and the inner side wall of the connecting ring table, and the second sealing element is embedded in the second embedding groove.

[0012] Further, the inner side wall of the connecting ring table is provided with a second ring groove, a containing groove for mounting a first bearing is formed between the second ring groove and the upper bearing sleeve, the first bearing forms a cylindrical surface contact with the inner side wall of the connecting ring table and the outer peripheral wall of the upper bearing sleeve respectively, the lower surface of the upper box cover of the upper shell is fixedly connected with the upper bearing sleeve, the inner periphery of the upper bearing sleeve supports a second bearing through a sinking groove, the second bearing sleeve is arranged on the outer periphery of the second input shaft, the outer periphery of the upper bearing sleeve is limit supported through the first bearing, and the outer periphery of the first bearing is limit supported in the inner periphery sinking groove of the connecting ring table fixedly connected with the lower shell.

[0013] Further, the lower shell comprises a lower box cover and a lower box body, the lower box cover is fixedly connected with the side wall of the lower box body, the lower box cover and the lower box body cooperatively form a lower liquid storage cavity, and a middle part of the lower box cover is provided with a connecting seat protruding upward, and the connecting ring table is mounted on the connecting seat.

[0014] Further, the lower box cover is further provided with a lower bearing sleeve, and the side wall of the lower bearing sleeve is provided with a third annular groove matched with the lower box cover.

[0015] Further, the lower box body is provided with a bearing base, the upper end of the bearing base is provided with a circular boss, and the circular boss is lockingly connected with the lower box body.

[0016] Further, the first sealing element and the second sealing element comprise a vertical part, a horizontal part and a abutting part which are sequentially connected, the lower ends of the vertical part and the abutting part are connected with two ends of the horizontal part respectively, and the side wall of the abutting part is provided with a protruding part protruding towards the outer side direction.

[0017] Further, the upper box cover of the upper shell constituting the upper liquid storage cavity is provided with an upper bearing sleeve extending downward on the bottom side of the middle part, and the upper side of the lower box cover of the lower shell constituting the lower liquid storage cavity is fixedly connected with a connecting ring table extending into the upper shell and being rotatably connected with the outer peripheral wall of the upper bearing sleeve to seal the upper liquid storage cavity.

[0018] Further, the bottom side of the upper box body of the upper shell is connected with an annular bottom plate bent towards the outer peripheral wall of the connecting ring table, the inner side of the annular bottom plate is provided with the first sealing element, the upper peripheral part of the connecting ring table is fixedly connected with the bottom side of the rotary gear located in the upper liquid storage cavity in a coaxial manner, and the side part of the upper box cover is provided with a first rotating shaft driven to rotate by the first motor and a first gear extending downward into the upper shell and connected with the lower end of the first rotating shaft to drive the rotary gear to rotate.

[0019] Further, the connecting ring table and the upper bearing sleeve are provided with a needle bearing, the inner peripheral wall of the rotary gear is coaxial and flush with the inner peripheral wall of the connecting ring table, that is, the inner peripheral wall of the rotary gear is coaxial and flush with the inner peripheral wall of the connecting ring table, so as to avoid the radial misalignment step, increase the working height and working contact area of the needle bearing, and improve the stability of the coaxial rotation of the lower shell relative to the upper shell; the middle part of the upper shell is provided with a second rotating shaft driven by the second motor at the upper end, the lower end of the second rotating shaft extends into the lower shell through the upper bearing sleeve, the gear segment of the second input shaft is located in the lower shell, and the grinding disc located at the bottom side of the lower shell is driven to rotate by the intermediate gear transmission mechanism in the lower shell; the second sealing element is inlaid between the bottom side of the inner peripheral wall of the connecting ring table and the bottom side of the outer peripheral wall of the upper bearing sleeve, and the second sealing element is located below the needle bearing and above the lower box cover.

[0020] Further, the radius of the first sealing element is larger than that of the second sealing element, and the radius of the first sealing element is smaller than the distance between the lower shell and the rotary axis of the first input shaft.

[0021] Further, from the center of the second input shaft outward, the second input shaft, the second bearing, the upper bearing sleeve with the sink groove supporting the second bearing on the inner periphery and the first bearing and the connecting ring table with the inner peripheral sink groove supporting the first bearing are coaxially sleeved in sequence.

[0022] The working method of the grinding machine gear box with good sealing effect, the second input shaft is connected with the output end of the second motor, the first input shaft is connected with the output end of the first motor, the first motor drives the first input shaft and the first gear to rotate, and then drives the rotary gear, the connecting ring table and the lower shell to rotate, thereby realizing the revolution of the grinding disc; the second motor drives the second input shaft and the gear segment to rotate, and then drives the gear transmission mechanism, the output shaft and the grinding disc to rotate, thereby realizing the rotation of the grinding disc. Advantages

[0023] Compared with the prior art, the box of the present application is provided with an upper liquid storage cavity and a lower liquid storage cavity, lubricating oil can be filled in the upper liquid storage cavity and the lower liquid storage cavity, and the driving parts inside the upper shell and the lower shell can be cooled and lubricated. Moreover, the structure of the present application is simple and convenient to install. In addition, the installation positions of the first sealing member and the second sealing member of the box of the present application are relatively close to the central position of the gear box, and the upper bearing sleeve, the first bearing and the connecting ring platform are arranged, which can effectively reduce the radial dimension of the first sealing member and the second sealing member, improve the service life of the sealing members, effectively ensure the coaxiality of the upper gear box and the lower gear box, and greatly improve the working condition of the gear box. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a perspective view of the outer shape structure of the present application.

[0025] Fig. 2 is a schematic view of the cross-sectional structure of the present application.

[0026] Fig. 3 is another schematic view of the cross-sectional structure of the present application.

[0027] Fig. 4 is a partial enlarged view of the A area in Fig. 2.

[0028] Fig. 5 is a schematic view of the present application.

[0029] Fig. 6 is a schematic view of a comparative example.

[0030] Fig. 7 is a cross-sectional perspective view of the present application.

[0031] Fig. 8 is a perspective view of the upper bearing sleeve.

[0032] Fig. 9 is a perspective view of the connecting ring platform.

[0033] In the drawings: upper shell 1, upper box cover 11, upper box body 12, extension 13, mounting seat 14, first input shaft 15, first gear 16, revolving gear 17, second input shaft 18, lower shell 2, lower box cover 21, connecting seat 211, lower box body 22, lower bearing sleeve 23, third annular groove 231, bearing base 24, circular boss 241, gear section 25, gear transmission mechanism 26, output shaft 27, upper bearing sleeve 3, sink 31, connecting ring platform 4, accommodating groove 41, upper liquid storage cavity 51, lower liquid storage cavity 52, first sealing member 61, vertical part 611, horizontal part 612, abutting part 613, protruding part 614, second sealing member 62, first embedding groove 71, second embedding groove 72, first bearing 8, second bearing 9, shaft coupling 10. Embodiment of the present application

[0034] In order to further explain the technical scheme of the present application, the present application will be described in detail below through specific examples.

[0035] As shown in Figures 1-4, a gear box of a grinding machine with good sealing effect, comprising an upper shell 1 and a lower shell 2, the middle part of the upper shell 1 is provided with an upper bearing sleeve 3, the middle part of the lower shell 2 is provided with a connecting ring table 4, the upper bearing sleeve 3 and the connecting ring table 4 are coaxially arranged and are rotatably connected with each other, the rotatable connection of the coaxial arrangement of the upper bearing sleeve 3 and the connecting ring table 4 can be a contact type or a non-contact type, the contact type coaxial arrangement rotatable connection can be realized by high-precision machining of the contact surface (cylindrical surface) of the two, the contact area is large and the stability is good; the non-contact type rotatable connection can have a gap between the two or install a first bearing 8, a bearing bush, a ring, etc. in the gap, the first bearing 8 of the application can adopt a needle bearing, etc. The rotatable connection of the coaxial arrangement (nesting) of the upper bearing sleeve 3 and the connecting ring table 4 makes the contact surface between the rotating part and the non-rotating part a larger cylindrical surface, which is conducive to maintaining the coaxial rotation of the lower shell relative to the upper shell (i.e. improving the stability of the rotation of the lower shell and reducing the shaking), and due to the improvement of the stability of the rotation and the reduction of the shaking, the sealing element (first sealing element 61 and second sealing element 62, etc.) is repeatedly extruded at high frequency and high amplitude, which is conducive to improving the service life and sealing effect of the sealing element and reducing the frequency of replacement.

[0036] The inside of the upper shell 1 cooperates with the connecting ring table 4 to form an upper liquid storage cavity 51, a first sealing element 61 is arranged between the upper shell 1 and the connecting ring table 4, and a second sealing element 62 is arranged between the upper bearing sleeve 3 and the connecting ring table 4, the first sealing element 61 and the second sealing element 62 seal the liquid storage cavity 51, and the first sealing element 61 and the second sealing element 62 can be rubber sealing elements.

[0037] A first input shaft 15 and a first gear 16 connected to the first input shaft are arranged on the side of the upper shell 1 and extend into the upper shell, the first gear is engaged with a rotating gear 17 located in the upper shell to drive the rotating gear, the first sealing element 61 has a larger radius than the second sealing element 62, and the radius of the first sealing element 61 is smaller than the distance between the lower shell and the rotating axis of the first input shaft, which is the vertical distance between the rotating axes of the first input shaft 15 and the second input shaft 18.

[0038] The installation positions of the first sealing element and the second sealing element in the box are close to the central position of the gear box (i.e. the radius of the first sealing element 61 is larger than that of the second sealing element 62, and the radius of the first sealing element 61 is smaller than the distance between the lower shell and the rotating axis of the first input shaft), so the radial size of the first sealing element and the second sealing element can be effectively reduced, the contact area between the sealing element and the rotating part is smaller, which is conducive to improving the sealing performance, and deformation and oil leakage are less likely to occur after a long time of work, the sealing performance of the oil storage cavity is improved, the service life of the sealing element is improved, and the maintenance frequency of the equipment is reduced.

[0039] The upper shell 1 comprises an upper box cover 11 and an upper box body 12, the upper box cover 11 is fixedly connected with the side wall of the upper box body 12, a plurality of through holes are arranged in the middle of the upper box cover 11, the upper bearing sleeve 3 is locked by screws at the through holes of the upper box cover 11 (of course, the two can also be integrally manufactured), and the connecting ring table 4 is arranged between the upper bearing sleeve 3 and the bottom wall of the upper box body 12. The bottom wall of the upper box body 12 is provided with a first embedding groove 71 on the side close to the connecting ring table, and the first sealing element 61 is embedded in the first embedding groove 71, and the first sealing element 61 seals the matching part of the upper box body 12 and the connecting ring table. The outer side wall of the upper bearing sleeve 3 is provided with a first ring groove at the lower end, and the first ring groove and the inner side wall of the connecting ring table 4 form a second embedding groove 72, and the second sealing element 62 is embedded in the second embedding groove 72, and the second sealing element 62 seals the matching part of the connecting ring table 4 and the upper bearing sleeve 3. The inner side wall of the connecting ring table 4 is provided with a second ring groove, and the second ring groove and the upper bearing sleeve 3 form a containing groove 41 for installing the first bearing 8 (which can be a needle bearing), and the inner circumferential wall of the rotary gear 17 is coaxial and flush with the inner circumferential wall of the connecting ring table 4 in the containing groove 41, that is, the inner circumferential wall of the rotary gear and the inner circumferential wall of the connecting ring table are coaxial and flush (the inner circumferential wall of the rotary gear and the inner circumferential wall of the connecting ring table are coaxial and flush, avoiding the radial misalignment step between the two, thereby increasing the working height and working contact area of the first bearing and the inner circumferential wall of the rotary gear 17 and the inner circumferential wall of the connecting ring table 4, improving the stability of the coaxial rotation of the lower shell relative to the upper shell, and when the inner circumferential wall of the rotary gear and the inner circumferential wall of the connecting ring table are not flush, that is, the radial misalignment step between the two, the working height and working contact area of the first bearing 8 are greatly reduced). The above structure improves the stability of the coaxial rotation of the lower shell relative to the upper shell, reduces the repeated high-frequency and high-amplitude extrusion of the sealing elements (the first sealing element 61 and the second sealing element 62, etc.), improves the service life and sealing effect of the sealing elements, reduces the replacement frequency, and makes the first sealing element 61 and the second sealing element 62 more firmly installed, and the installation position of the first sealing element 61 and the second sealing element 62 is closer to the center of the gear box, so that the radial size of the first sealing element 61 and the second sealing element 62 is smaller and is not easy to deform. In addition, the connecting ring table 4 can be made of steel material, and the first sealing element 61 and the second sealing element 62 are not easy to wear out when abutting against the connecting ring table 4, further improving the service life of the sealing elements.

[0040] The upper bearing sleeve 3 is fixed on the lower surface of the upper box cover 11, the inner periphery of the upper bearing sleeve 3 is supported by a sink groove, and the second bearing 9 (which can be a deep groove ball bearing, a cylindrical roller bearing, a tapered roller bearing, etc.) is sleeved on the outer periphery of the second input shaft 18, the outer periphery of the upper bearing sleeve 3 is supported by the first bearing 8, and the outer periphery of the first bearing 8 is further supported in the inner periphery sink groove of the connecting ring table 4 which is fixedly connected with the lower shell 2; that is, the second bearing 9, the upper bearing sleeve 3 and the connecting ring table 4 form coaxial cylindrical surface contact, the contact area is large, which is conducive to improving the stability of the coaxial rotation of the lower shell which is fixedly connected with the connecting ring table 4.

[0041] That is, from the center outward, the second input shaft 18, the second bearing 9, the upper bearing sleeve 3 (the inner periphery has a sink groove 31 for supporting the second bearing 9, and the outer periphery supports the first bearing 8), the first bearing 8 and the connecting ring table 4 (the inner periphery has an inner periphery sink groove for supporting the first bearing 8, that is, a containing groove 41) are coaxially sleeved in sequence, the cylindrical surface contact each other, the contact area is large, which is conducive to improving the stability of the coaxial rotation of the lower shell relative to the upper shell and reducing the shaking, due to the improvement of the rotation stability and the reduction of the shaking, the sealing element is repeatedly extruded at a high frequency and a high amplitude, which is conducive to improving the service life and the sealing effect of the sealing element, and reducing the frequency of replacement.

[0042] The upper end of the upper bearing sleeve 3 is fixedly connected with the lower surface of the upper box cover 11 (which can be bolted or welded), the lower end of the upper bearing sleeve 3 can be in contact or not in contact with the upper surface of the lower box cover 21, the upper end of the connecting ring table 4 is fixedly connected with the lower surface of the rotary gear 17 (which can be bolted or welded), and the lower end of the connecting ring table 4 is fixedly connected with the upper surface of the lower box cover 21 (which can be bolted or welded).

[0043] The inner periphery sink groove of the connecting ring table 4 makes the width of the contact with the upper surface of the lower box cover 21 larger than the upper end, and the wider contact between the connecting ring table 4 and the upper surface of the lower box cover 21 is conducive to increasing the stability.

[0044] Preferably, the upper shell 1 is provided with an outwardly extending extension 13, the upper box cover 11 is provided with a mounting seat 14 on the extension 13, the extension 13 can increase the internal space of the upper liquid storage cavity 51, and it is convenient to install the first input shaft 15 and the first gear 16 for driving the rotation of the lower shell 2, so that the first input shaft 15 and the first gear 16 are more convenient to disassemble and assemble.

[0045] The second input shaft 18 is arranged between the upper shell 1 and the lower shell 2, the part of the second input shaft in the upper shell is rotationally connected with the upper bearing sleeve 3, the part of the second input shaft 18 in the lower shell has a gear segment 25, the gear segment drives the rotation of the output shaft 27 connected with the grinding disc (not shown in the figure, which is installed on the lower end of the output shaft 27) through the gear transmission mechanism 26 in the lower shell, so as to realize the rotation of the grinding disc.

[0046] In operation, the second input shaft 18 is connected to the output end of a second motor (not shown in the figure, the output shaft of the second motor can be connected to the second input shaft 18 through a shaft coupling 10), the first input shaft 15 is connected to the output end of a first motor, the first motor drives the first input shaft 15 and the first gear 16 to rotate, which in turn drives the rotation of the slewing gear 17, the connecting ring platform 4 and the lower housing 2, thereby achieving the revolution of the grinding disc; the second motor drives the rotation of the second input shaft 18 and the gear segment 25, which in turn drives the rotation of the gear transmission mechanism 26, the output shaft 27 and the grinding disc, thereby achieving the rotation of the grinding disc.

[0047] The present application is provided with three sets of evenly distributed grinding discs on the circumference of the grinding machine, and the three sets of grinding discs are driven to rotate by a set of intermediate gears (the rotation shaft of the intermediate gear is rotatably connected to the lower housing) as a gear transmission mechanism, or the present application is provided with four sets of evenly distributed grinding discs on the circumference of the grinding machine, wherein the opposite two grinding discs and the output shaft are respectively driven to rotate by a set of intermediate gears as a gear transmission mechanism, and the other opposite two grinding discs and the output shaft are respectively driven to rotate by two sets of intermediate gears that are sequentially driven as a gear transmission mechanism, thereby achieving the rotation of two of the four grinding discs in the same direction and the rotation of the other two in opposite directions, which is beneficial to improve the rotation stability of the grinding machine.

[0048] In the present embodiment, the lower housing 2 includes a lower box cover 21 and a lower box body 22, the lower box cover 21 is fixedly connected to the side wall of the lower box body 22, the lower box cover 21 and the lower box body 22 cooperate to form a lower liquid storage cavity 52, the middle part of the lower box cover 21 is provided with an upwardly protruding connecting seat 211, and the connecting ring platform 4 is installed on the connecting seat 211, so that the connecting ring platform 4 is more firmly installed, and the upper housing 1 and the lower housing 2 have a spacing therebetween to avoid touching during rotation. The lower box cover 21 is also provided with a lower bearing sleeve 23, the side wall of the lower bearing sleeve 23 is provided with a third annular groove 231 matched with the lower box cover 21, and the lower bearing sleeve 23 is locked and matched with the lower box cover 21 through the third annular groove. The lower box body 22 is provided with a bearing base 24, the upper end of the bearing base 24 is provided with a circular boss 241, and the circular boss 241 is locked and connected with the lower box body 22. The lower bearing sleeve 23 and the bearing base 24 can be used to install bearings, which facilitates the installation of the second input shaft 18, and the second input shaft 18 is arranged in parallel with the first input shaft.

[0049] Preferably, the first sealing member 61 and the second sealing member 62 include a vertical part 611, a horizontal part 612 and an abutting part 613 connected in sequence, the lower ends of the vertical part 611 and the abutting part 613 are respectively connected to the two ends of the horizontal part 612, and the side wall of the abutting part 613 is provided with a protruding part 614 protruding outward. After the above structure is adopted, the structural strength of the first oil seal member is higher, the protruding part 614 can abut against and seal the side wall of the cooperating member, and the sealing performance of the sealing member is further improved.

[0050] Figure 5 is a diagram of the present application, and Figure 6 is a diagram of a comparative example; Based on the problems mentioned in the background art: the seal is installed on the outer side of the upper box body, the radial size of the seal is large, and deformation occurs after a long time of work, causing the oil storage cavity to leak oil. In order to overcome this problem, the radial size of the seal is minimized as much as possible, which is a technical solution. Compared with the present application, the comparative example not only omits the upper bearing sleeve 3 and the first bearing 8, saving cost, but also has a smaller radial size of the seal. In theory, the comparative example can overcome the defects of Comparative Document 1 (the disclosure CN117583972B mentioned in the background art) and achieve the purpose of Comparative Document 1 (by outputting different rotational speeds of two motors, different transmission ratios are adjusted). It also has a more simplified structure, lower manufacturing cost and better sealing performance compared to the present application. However, on the contrary, the service life of the seal of the comparative example (i.e. the time when oil leakage occurs relative to Comparative Document 1) is not shortened, and the quality of floor grinding under the same conditions is actually lower than that of Comparative Document 1.

[0051] After a long period of trial and research, it was found that the grinding disc of the floor grinding machine (comparative example) has self-rotation and revolution during operation, and the vibration of the grinding machine is relatively large. The lower shell of the upper shell of the machine frame has a large amplitude of vibration, the seal is subjected to a larger and higher frequency of compression, and the service life is short. In the technical solution of the present application, the upper bearing sleeve 3 is fixedly arranged on the lower surface of the upper box cover 11. The inner periphery of the upper bearing sleeve 3 is supported by the second bearing 9 through a sink groove. The second bearing 9 is sleeved on the outer periphery of the second input shaft. The outer periphery of the upper bearing sleeve 3 is supported by the first bearing 8. The outer periphery of the first bearing 8 is further supported in the inner periphery sink groove of the connecting ring table 4 fixedly connected with the lower shell 2. Thus, the stability of the coaxial rotation of the lower shell 2 relative to the upper shell 1 and the reduction of vibration are improved. Although the diameters of the first seal 61 and the second seal 62 of the present application are not the smallest compared to the comparative example, the service life of the first seal 61 and the second seal 62 of the present application is significantly improved compared to Comparative Document 1 and the comparative example.

[0052] Compared with the prior art, the box of the present application is provided with an upper liquid storage cavity and a lower liquid storage cavity, which can be filled with lubricating oil to cool and lubricate the driving parts inside the upper shell and the lower shell. Moreover, the structure of the present application is simple and easy to install. In addition, the installation position of the first seal and the second seal in the box of the present application is close to the center position of the gear box, and the upper bearing sleeve, the first bearing and the connecting ring table are arranged. While effectively reducing the radial size of the first seal and the second seal and improving the service life of the seal, the relative coaxial rotation of the upper and lower liquid storage cavities (i.e. the lower shell relative to the upper shell) is effectively ensured, and the stability of rotation is improved, thereby greatly improving the working condition of the gear box.

[0053] The above embodiments and drawings are not intended to limit the product shape and style of the present application, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the scope of the patent of the present application.

Claims

1. A grinding machine gearbox with good sealing performance, characterized in that, The upper shell and the lower shell are provided with an upper bearing sleeve and a connecting ring, the upper bearing sleeve and the connecting ring are coaxially arranged and are connected in a relative rotation mode, the upper shell and the connecting ring are matched to form an upper liquid storage cavity, a first sealing element is arranged between the upper shell and the connecting ring, and a second sealing element is arranged between the upper bearing sleeve and the connecting ring.

2. A sealed gear box for a grinder as claimed in claim 1, wherein, The upper shell comprises an upper box cover and an upper box body, the upper box cover is fixedly connected with the side wall of the upper box body, and the bottom wall of the upper box body is provided with a first embedding groove on the side close to the connecting ring.

3. A sealed gear box for a grinder as claimed in claim 1, wherein, The outer side wall of the upper bearing sleeve is provided with a first ring groove, the first ring groove and the inner side wall of the connecting ring form a second embedding groove, and the second sealing element is embedded in the second embedding groove.

4. A sealed gear box for a grinder as claimed in claim 1, wherein, The inner side wall of the connecting ring is provided with a second ring groove, the second ring groove and the upper bearing sleeve form a containing groove for mounting the first bearing, the first bearing is in cylindrical surface contact with the inner side wall of the connecting ring and the outer peripheral wall of the upper bearing sleeve respectively, the lower surface of the upper box cover of the upper shell is fixedly connected with the upper bearing sleeve, the inner periphery of the upper bearing sleeve supports the second bearing through a sinking groove, the second bearing is sleeved on the outer periphery of the second input shaft, the outer periphery of the upper bearing sleeve is limit supported through the first bearing, and the outer periphery of the first bearing is limit supported in the inner periphery sinking groove of the connecting ring fixedly connected with the lower shell.

5. A sealed gear box for a grinder as claimed in claim 1, wherein, The lower shell comprises a lower box cover and a lower box body, the lower box cover is fixedly connected with the side wall of the lower box body, and the lower box cover and the lower box body are matched to form a lower liquid storage cavity, and the middle part of the lower box cover is provided with an upwardly protruding connecting seat, and the connecting ring is mounted on the connecting seat.

6. A sealed mill gear housing according to claim 5, wherein, The lower box cover is further provided with a lower bearing sleeve, the side wall of the lower bearing sleeve is provided with a third annular groove matched with the lower box cover, and the lower box body is mounted with a bearing base, and the upper end of the bearing base is provided with a circular boss locked and connected with the lower box body.

7. A sealed gear box for a grinder as claimed in claim 1, wherein, The first sealing element and the second sealing element comprise a vertical part, a horizontal part and a abutting part connected in sequence, the lower ends of the vertical part and the abutting part are connected with the two ends of the horizontal part respectively, and the side wall of the abutting part is provided with a protruding part protruding towards the outer side direction.

8. A sealed gear box for a grinder as claimed in claim 1, wherein, The middle part of the upper box cover of the upper shell forming the upper liquid storage cavity is provided with an upper bearing sleeve extending downward, the upper side of the lower box cover of the lower shell forming the lower liquid storage cavity is fixedly connected with a connecting ring extending into the upper shell and rotatably connected with the outer peripheral wall of the upper bearing sleeve, so as to seal the upper liquid storage cavity.

9. A sealed mill gear housing according to claim 8, wherein, The bottom side of the upper box body of the upper shell is connected with a ring-shaped bottom plate bent towards the outer peripheral wall of the connecting ring, the inner side of the ring-shaped bottom plate is provided with the first sealing element, the upper peripheral part of the connecting ring is fixedly connected with the bottom side of the rotary gear in the upper liquid storage cavity in a coaxial mode, the side part of the upper box cover is provided with a first rotating shaft driven to rotate by a first motor, and the first gear connected with the lower end of the first rotating shaft and driven to rotate the rotary gear extends downward into the upper shell. The upper shell and the lower shell are provided with an upper bearing sleeve and a connecting ring, the upper bearing sleeve and the connecting ring are coaxially arranged and are connected in a relative rotation mode, the upper shell and the connecting ring are matched to form an upper liquid storage cavity, a first sealing element is arranged between the upper shell and the connecting ring, and a second sealing element is arranged between the upper bearing sleeve and the connecting ring.

10. A sealed mill gear housing according to claim 9, wherein, The first bearing is arranged between the connecting ring table and the upper bearing sleeve, the inner peripheral wall of the rotary gear is coaxial and flush with the inner peripheral wall of the connecting ring table, that is, the inner peripheral wall of the rotary gear is coaxial and flush with the inner peripheral wall of the connecting ring table, so as to avoid the radial misalignment step, increase the working height and working contact area of the needle bearing, and improve the stability of the lower shell relative to the upper shell coaxial rotation; The middle part of the upper shell is provided with a second rotating shaft driven by a second motor at the upper end, the lower end of the second rotating shaft extends into the lower shell through the upper bearing sleeve, the gear section in the lower shell, and the grinding disc on the bottom side of the lower shell is driven to rotate through the intermediate gear transmission mechanism in the lower shell; The inner peripheral wall of the connecting ring table is inlaid with a second sealing element between the bottom side of the outer peripheral wall of the upper bearing sleeve, and the second sealing element is located below the needle bearing and above the lower box cover.

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