Milling Groove Machine Transmission System and Milling Groove Machine

Abstract

The present invention discloses a milling groove machine transmission system and a milling groove machine, which relate to the field of construction machinery and are used to reduce the possibility of seal failure of the transmission system. The milling groove machine transmission system includes a motor, a pump housing, a support cylinder, a transmission shaft, an impeller, a support assembly, and a floating support assembly. The support cylinder is located between the motor and the pump housing and is installed on the pump housing; the support cylinder includes a cavity. The transmission shaft is installed in the cavity and is drivingly connected to the motor at one end. The impeller is located in the pump housing; the impeller is drivingly connected to the other end of the transmission shaft. The first support member and the second support member of the support assembly are both installed in the cavity, the first support member supports one end of the transmission shaft, and the second support member supports the middle part of the transmission shaft. The floating support assembly is installed on the pump housing; the flexible support member of the floating support member is in abutting contact with the transmission shaft, and there is a set gap between the rigid support member and the transmission shaft. The above technical solution improves the support stiffness of the transmission shaft and reduces the possibility of seal failure problems caused by the deformation of the transmission shaft.

Description

Technical Field

[0001] The present invention relates to the field of construction machinery, and particularly to a transmission system of a milling machine and a milling machine. Background Art

[0002] A double-wheel milling machine is a device for forming grooves in diaphragm walls. The working device is suspended by a wire rope and rotates in opposite directions by two milling wheels in a groove filled with slurry, and vertically excavates rock and soil downward. After the stripped rock and soil are mixed with the slurry, they are pumped by a slurry pump and sent to the ground.

[0003] When the slurry pump of the double-wheel milling machine works, power is output by a hydraulic motor or an electric motor, and the impeller is driven to rotate through a transmission device to transport the slurry containing solid particles to the ground.

[0004] Since the working depth of the double-wheel milling machine is large, generally up to 100 meters, the slurry pressure outside the slurry pump is high and contains a large amount of solid particles, which easily causes the sealing device of the transmission device to fail and the slurry to enter the inside of the transmission device. And how to ensure that the sealing device of the slurry transmission device works normally underwater for a long time has always been a very difficult problem.

[0005] In the related art, a mechanical seal is installed at the mating position of the transmission device and the transmission shaft to prevent the external slurry pressure from entering. Or, a combination of packing seal, lip seal, and mechanical seal is used to achieve sealing.

[0006] The inventor found that there are at least the following problems in the prior art: Whether it is a simple mechanical seal or a multi-layer sealing method combining packing seal, lip seal, and mechanical seal, the sealing failure still occurs during the working process of the transmission system. Summary of the Invention

[0007] The present invention provides a transmission system of a milling machine and a milling machine to reduce the possibility of sealing failure of the transmission system.

[0008] An embodiment of the present invention provides a transmission system of a milling machine, including:

[0009] A motor;

[0010] A pump housing;

[0011] A support cylinder located between the motor and the pump housing, and the support cylinder is installed on the pump housing; the support cylinder includes a cavity;

[0012] A transmission shaft installed in the cavity and drivingly connected to the motor at one end;

[0013] An impeller located in the pump housing; the impeller is drivingly connected to the other end of the transmission shaft;

[0014] A support assembly, including a first support member and a second support member; both the first support member and the second support member are installed in the cavity, the first support member supports one end of the transmission shaft, and the second support member supports the other end of the transmission shaft; and

[0015] A floating support assembly, installed on the pump housing; the floating support member includes a flexible support member and a rigid support member; the flexible support member abuts against the transmission shaft in contact, and there is a set gap between the rigid support member and the transmission shaft.

[0016] In some embodiments, the rigid support member is fixedly connected to the pump housing; the rigid support member includes a first through hole and a second through hole; the inner diameter dimension of the first through hole is smaller than the inner diameter dimension of the second through hole; the second through hole is located on the side of the first through hole facing the motor; the transmission shaft passes through the first through hole and the second through hole; the flexible support member is installed in the second through hole.

[0017] In some embodiments, the rigid support member includes a first ring body and a first protrusion, which are fixedly connected; the first ring body includes the first through hole; the first protrusion includes the second through hole.

[0018] In some embodiments, the floating support assembly further includes:

[0019] A pressing assembly, installed on the side of the rigid support member away from the pump housing; the pressing assembly is fixedly connected to the rigid support member; and

[0020] A locking ring, installed on the side of the pressing assembly away from the rigid support member; and

[0021] A locking member, fixedly connecting the pressing assembly and the locking ring.

[0022] In some embodiments, the pressing assembly includes:

[0023] A second ring body, located between the locking ring and the rigid support member; the second ring body presses the first protrusion; and

[0024] A second protrusion, fixed to the second ring body; at least a part of the second protrusion is inserted into the second through hole to press the flexible support member located in the second through hole;

[0025] Wherein, a through hole penetrates through the second ring body and the second protrusion; the transmission shaft is located in the through hole.

[0026] In some embodiments, the floating support assembly further includes:

[0027] A guiding member, wherein the pressing assembly, the locking ring and the rigid support member are all provided with coaxially and communicatively arranged guiding holes, and the guiding member is inserted into each of the guiding holes; and

[0028] A locking assembly, mounted on the guiding member to fix the rigid support member, the pressing assembly and the locking ring.

[0029] In some embodiments, the locking assembly includes:

[0030] An elastic member, sleeved on the part of the guiding member located outside the locking ring;

[0031] A retaining sleeve, located on the side of the elastic member away from the locking ring; and

[0032] A nut, threadedly connected to the guiding member to fixedly connect the pressing assembly and the locking ring to the rigid support member.

[0033] In some embodiments, the pressing assembly includes a first pressing half-ring and a second pressing half-ring; the first pressing half-ring and the second pressing half-ring are pieced together to form a ring.

[0034] In some embodiments, the locking ring includes a first locking half-ring and a second locking half-ring, and the first locking half-ring and the second locking half-ring are pieced together to form a ring.

[0035] In some embodiments, the pressing assembly includes a first pressing half-ring and a second pressing half-ring; the first pressing half-ring and the second pressing half-ring are pieced together to form a ring; the locking ring includes a first locking half-ring and a second locking half-ring, and the first locking half-ring and the second locking half-ring are pieced together to form a ring; the splicing surface of the first pressing half-ring and the second pressing half-ring is a first splicing surface; the splicing surface of the first locking half-ring and the second locking half-ring is a second splicing surface; the first splicing surface and the second splicing surface are staggered in the circumferential direction of the locking ring.

[0036] In some embodiments, the first splicing surface and the second splicing surface are staggered 90° in the circumferential direction of the locking ring.

[0037] In some embodiments, the transmission system of the milling machine further includes:

[0038] A sealing assembly, mounted on the transmission shaft and located on the side of the second support member away from the first support member; the sealing assembly, the transmission shaft and the support cylinder together form a sealing cavity; the support assembly is located in the sealing cavity; the sealing cavity is used for filling lubricating oil.

[0039] In some embodiments, the sealing assembly includes a sealing ring.

[0040] In some embodiments, the flexible support member includes packing; and the number of the flexible support members is plural.

[0041] In some embodiments, the milling groove machine drive system further includes:

[0042] a casing, sleeved outside the transmission shaft and fixedly connected to the transmission shaft

[0043] In some embodiments, the set clearance is 1 mm to 3 mm.

[0044] An embodiment of the present invention further provides a milling groove machine, including the milling groove machine drive system provided by any technical solution of the present invention.

[0045] For the milling groove machine drive system provided by the above technical solution, its transmission shaft is always supported by the first support member and the second support member; and when the transmission shaft does not deform or the deformation amount is small, the flexible support member also supports the transmission shaft. At this time, the support mode of the transmission shaft is double-point rigid support plus single-point flexible support; when the deformation amount of the moving shaft is large, the rigid support member supports the transmission shaft. At this time, the support mode of the transmission shaft is a three-point rigid support structure. This support mode greatly improves the support stiffness of the transmission shaft, reduces the possibility of the transmission shaft deforming, and reduces or even avoids the possibility of the sealing failure problem caused by the deformation of the transmission shaft. Description of the Drawings

[0046] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0047] Figure 1 is a schematic structural diagram of the milling groove machine drive system provided by an embodiment of the present invention.

[0048] Figure 2 is Figure 1 a partial enlarged schematic diagram of...

[0049] Figure 3 is a schematic structural diagram of the floating support assembly of the milling groove machine drive system provided by an embodiment of the present invention.

[0050] Reference Signs:

[0051] 1. Motor; 2. Pump housing; 3. Support cylinder; 4. Transmission shaft; 5. Impeller; 6. Support assembly; 7. Floating support assembly; 8. Sealing assembly; 9. Casing; 61. First support member; 62. Second support member; 70. Guide hole; 71. Flexible support member; 72. Rigid support member; 73. Pressing assembly; 74. Locking ring; 75. Locking member; 76. Guide member; 77. Locking assembly; 721. First through hole; 722. Second through hole; 723. First ring body; 724. First protrusion; 731. Second ring body; 732. Second protrusion; 733. Through hole; 734. First pressing half ring; 735. Second pressing half ring; 741. First locking half ring; 742. Second locking half ring; 771. Elastic member; 772. Retaining sleeve; 773. Nut. Detailed implementation manners

[0052] The following Figures 1 to 3 elaborates on the technical solutions provided by the present invention in more detail.

[0053] Through long-term creative labor, the inventor found that the reasons for the failure of the mechanical seal on the transmission shaft are relatively complex: including the external harsh mud liquid environmental factors, and more importantly, the reasons within the pump body itself. That is, when the transmission shaft is working, the imbalance of the impeller itself and the uneven output of the mud liquid cause the transmission shaft to bend and deform, which in turn drives the separation of the dynamic ring and the static ring of the mechanical seal on the pump shaft, resulting in seal failure. Moreover, as the rotational speed of the transmission shaft increases, the failure phenomenon becomes more significant. The prior art did not find the problem of seal failure caused by the deformation of the transmission shaft, nor did it propose corresponding solutions. The technical solutions provided in the embodiments of the present invention can effectively solve the seal failure problem caused by the deformation of the transmission shaft.

[0054] Referring to Figure 1 , some embodiments of the present invention provide a milling machine drive system, which includes a motor 1, a pump housing 2, a support cylinder 3, a transmission shaft 4, an impeller 5, a support assembly 6, and a floating support assembly 7.

[0055] The motor 1 is used to provide power, and the motor 1 drives the transmission shaft 4 to rotate. The pump housing 2 is used to accommodate the pump. The support cylinder 3 is located between the motor 1 and the pump housing 2, and the support cylinder 3 is installed on the pump housing 2; the support cylinder 3 includes a cavity. The transmission shaft 4 is installed in the cavity, and one end of the transmission shaft 4 is drivingly connected to the motor 1; the impeller 5 is located in the pump housing 2; the impeller 5 is drivingly connected to the other end of the transmission shaft 4. The support assembly 6 includes a first support member 61 and a second support member 62; both the first support member 61 and the second support member 62 are installed in the cavity, the first support member 61 supports one end of the transmission shaft 4, and the second support member 62 supports the middle part of the transmission shaft 4. The floating support assembly 7 is installed on the pump housing 2; the floating support member includes a flexible support member 71 and a rigid support member 72; the flexible support member 71 abuts against the outer wall of the transmission shaft 4 to reduce the leakage of the slurry liquid inside the pump body. The flexible support member 71 has a compensation function and can automatically press tightly after wear to continuously maintain the effect. There is a set gap a between the rigid support member 72 and the transmission shaft 4. In some embodiments, the set gap a is 1 mm to 3 mm, such as 1 mm, 2 mm, 3 mm.

[0056] The support cylinder 3 is a hollow cylindrical structure. The transmission shaft 4 passes through the support cylinder 3, and both ends of the transmission shaft 4 are located outside the support cylinder 3; one end of the transmission shaft 4 is drivingly connected to the motor 1, and the other end of the transmission shaft 4 is drivingly connected to the impeller 5. During the rotation of the transmission shaft 4, the support cylinder 3 remains stationary and does not rotate with the transmission shaft 4.

[0057] The support assembly 6 is used to support the transmission shaft 4 to make the rotation of the transmission shaft 4 more stable. The first support member 61 and the second support member 62 of the support assembly 6 are both bearings, for example. The two bearings are distributed at intervals to support two positions of the transmission shaft 4.

[0058] Continue to refer to Figure 1 , in some embodiments, the milling machine drive system further includes a sealing assembly 8, the sealing assembly 8 is installed on the transmission shaft 4 and is located on the side of the second support member 62 away from the first support member 61; the sealing assembly 8, the transmission shaft 4 and the support cylinder 3 together form a sealing cavity; the support assembly 6 is located in the sealing cavity; the sealing cavity is used to hold lubricating oil. The lubricating oil plays a lubricating role for the first support member 61 and the second support member 62. The sealing assembly 8 adopts dynamic sealing.

[0059] The floating support assembly 7 has two support methods for the transmission shaft 4. One is to support with the flexible support member 71, and the other is to support with the rigid support member 72.

[0060] During the working process, the motor 1 outputs power, and the transmission shaft 4 inside the transmission device rotates under the support of the first support member 61 and the second support member 62, and drives the impeller 5 to convey the slurry containing solid particles to the ground. Due to the imbalance of the impeller 5 itself or the non-uniformity when outputting the slurry, when the transmission shaft 4 drives the impeller 5 to rotate, the unbalanced force will cause the transmission shaft 4 to bend and deform.

[0061] If the transmission shaft 4 does not have excessive deformation, the transmission shaft 4 remains in contact with the flexible support member 71, and the transmission shaft 4 is supported by the flexible support member 71. When the unbalanced force is small, the deformation amount of the transmission shaft 4 is small. At this time, under the pressing action of the pressing component 73, the flexible support member 71 can provide a small straightening force, improve the support stiffness of the transmission shaft 4, and reduce the deformation of the transmission shaft 4.

[0062] If the unbalanced force received by the transmission shaft 4 is large, it will exceed the straightening force provided by the flexible support member 71, and the deformation amount of the transmission shaft 4 will continue to increase; when the deformation amount of the transmission shaft 4 reaches the set clearance, the rigid support member 72 will provide rigid support to prevent the transmission shaft 4 from continuing to deform, prevent the dynamic ring and the static ring of the mechanical seal assembly 8 on the pump shaft from separating, and prevent seal failure.

[0063] See Figures 1 to 3 , in some embodiments, the rigid support member 72 is fixedly connected to the pump housing 2; the rigid support member 72 includes a first through hole 721 and a second through hole 722. The first through hole 721 and the second through hole 722 are coaxially arranged. The inner diameter dimension of the first through hole 721 is smaller than the inner diameter dimension of the second through hole 722. The second through hole 722 is located on the side of the first through hole 721 facing the motor 1; the transmission shaft 4 passes through the first through hole 721 and the second through hole 722; the flexible support member 71 is installed in the second through hole 722.

[0064] See Figure 2 , from the cross-sectional view of the rigid support member 72, the cross-section of the rigid support member 72 is generally T-shaped, and the first through hole 721 and the second through hole 722 form a stepped hole. The aperture of the second through hole 722 is larger than the aperture of the first through hole 721, and the transmission shaft 4 passes through the first through hole 721 and the second through hole 722. There is a clearance between the outer wall of the transmission shaft 4 and the inner wall of the second through hole 722, and the flexible support member 71 is located in the clearance. The flexible support member 71 is in close contact with the inner wall of the second through hole 722 and the outer wall of the transmission shaft 4. The flexible support member 71 reduces the clearance b between the impeller 5 and the pump housing 2.

[0065] In some embodiments, in order to protect the transmission shaft 4, a protective cylinder 9 is provided outside the transmission shaft 4. The protective cylinder 9 is fixedly connected to the transmission shaft 4, and the two rotate synchronously. In the embodiments where the protective cylinder 9 is provided, the flexible support member 71 is in close contact with the inner wall of the second through hole 722 and the outer wall of the protective cylinder 9. Providing the protective cylinder 9 can improve the service life of the transmission shaft 4.

[0066] See Figure 1 and Figure 2 Figure 1 and Figure 2 , the rigid support member 72 includes a first ring body 723 and a first protrusion 724, which are fixedly connected; the first ring body 723 includes a first through hole 721; the first protrusion 724 includes a second through hole 722. The height of the first protrusion 724 is greater than the height of the first ring body 723, and the first protrusion 724 plays a protective role for the flexible support member 71. The flexible support member 71 is located at the bottom of the second through hole 722, and the flexible support member 71 is not easily detached from the second through hole 722. Moreover, a plurality of flexible support members 71, such as two flexible support members 71, can be provided in the second through hole 722.

[0067] To compress the rigid support member 72, the floating support assembly 7 further includes a compression assembly 73, a locking ring 74, and a locking member 75. The compression assembly 73 is installed on the side of the rigid support member 72 away from the pump housing 2; the compression assembly 73 is fixedly connected to the rigid support member 72. The locking ring 74 is installed on the side of the compression assembly 73 away from the rigid support member 72. The locking member 75 fixedly connects the compression assembly 73 and the locking ring 74, so that the compression assembly 73 and the locking ring 74 form an integral body.

[0068] In some embodiments, the compression assembly 73 includes a second ring body 731 and a second protrusion 732. The second ring body 731 compresses the first protrusion 724 of the rigid support member 72. The second protrusion 732 is fixed to the second ring body 731, and the second protrusion 732 protrudes from the second ring body 731. The second protrusion 732 is fixed to the second ring body 731; the second protrusion 732 is at least partially inserted into the second through hole 722 to compress the flexible support member 71 located in the second through hole 722. Among them, the through hole 733 penetrates through the second ring body 731 and the second protrusion 732; the transmission shaft 4 is located in the through hole 733. The second ring body 731 is used to compress and fix the first protrusion 724, and the second protrusion 732 is used to fix the flexible support member 71. The first ring body 723 is fixedly connected to the pump housing 2 through components such as bolts. In this way, the stable fixation of the flexible support member 71 and the rigid support member 72 is achieved respectively. The flexible support member 71 bears the extrusion force of the second protrusion 732 of the compression assembly 73, so that the flexible support member 71 is in close contact with the transmission shaft 4.

[0069] See Figure 2 and Figure 3, the floating support assembly 7 further includes a guide member 76 and a locking assembly 77. The pressing assembly 73, the locking ring 74, and the rigid support member 72 are all provided with coaxially and communicatively arranged guide holes 70, and the guide member 76 is inserted into each guide hole 70. The locking assembly 77 is installed on the guide member 76 to fix the rigid support member 72, the pressing assembly 73, and the locking ring 74. The guide member 76 is, for example, a guide post, and a plurality of guide members 76 are distributed along the circumference of the locking ring 74, for example, four, six, etc. are provided. Figure 3 Four guide members 76 are provided.

[0070] To more conveniently fix the guide member 76, the locking assembly 77 includes a nut 773, a retaining sleeve 772, and an elastic member 771; the elastic member 771 is sleeved on the portion of the guide member 76 located outside the locking ring 74; the retaining sleeve 772 is located on the side of the elastic member 771 away from the locking ring 74; the nut 773 is threadedly connected to the guide member 76 to fixedly connect the pressing assembly 73 and the locking ring 74 to the rigid support member 72. One end of each guide member 76 is inserted into the corresponding guide hole 70 of the locking ring 74, the pressing assembly 73, and the rigid support member 72. The other end of each guide member 76 is sequentially installed with the elastic member 771, the retaining sleeve 772, and the nut 773.

[0071] Tightening the nut 773 can press the retaining sleeve 772 and the elastic member 771 against the surface of the locking ring 74. The elastic member 771 is compressed to generate tension, and then presses the pressing assembly 73 downward to press the flexible support member 71. When the flexible support member 71 is worn, the elastic member 771 continues to release tension and continuously presses the pressing assembly 73 downward, thereby pressing the flexible support member 71 so that the flexible support member 71 can continuously provide a centering force. This installation method realizes the compensation function of the flexible support member 71, enabling the flexible support member 71 to be automatically pressed after wear and continuously maintaining the effect.

[0072] See Figure 2 and Figure 3 , for installation and maintenance without disassembling the pump body. The flexible support member 71 adopts a split structure. The rigid support member 72 can also adopt a split structure, and the whole ring body is formed by piecing together two half rings 72a and 72b. Each half ring of the rigid support member 72 is fixed to the pump housing 2 by a plurality of bolts.

[0073] See Figure 2 and Figure 3 , in some embodiments, the pressing assembly 73 includes a first pressing half ring 734 and a second pressing half ring 735; the first pressing half ring 734 and the second pressing half ring 735 are pieced together to form a ring. The pressing assembly 73 adopts a structure of two half rings, which is convenient for installation and can realize the installation of the pressing assembly 73 without disassembling the pump body.

[0074] In some embodiments, the locking ring 74 includes a first locking half-ring 741 and a second locking half-ring 742, and the first locking half-ring 741 and the second locking half-ring 742 are pieced together to form a ring shape.

[0075] See Figure 2 and Figure 3 , in some embodiments, the splicing surface of the first pressing half-ring 734 and the second pressing half-ring 735 is the first splicing surface m; the splicing surface of the first locking half-ring 741 and the second locking half-ring 742 is the second splicing surface n; the first splicing surface m and the second splicing surface n are staggered in the circumferential direction of the locking ring 74. On the one hand, it is convenient for installation, and on the other hand, it can also make the first pressing half-ring 734 and the second pressing half-ring 735 of the pressing assembly 73 be fixed to form a complete ring. If the first splicing surface m and the second splicing surface n are not staggered but aligned, the first pressing half-ring 734 and the first locking half-ring 741 will form a half-ring assembly; the second pressing half-ring 735 and the second locking half-ring 742 will form a half-ring assembly, and thus a complete ring body cannot be formed.

[0076] See Figure 2 and Figure 3 , in some embodiments, the first splicing surface m and the second splicing surface n are staggered 90° in the circumferential direction of the locking ring 74.

[0077] In some embodiments, the sealing assembly 8 includes a sealing ring.

[0078] In some embodiments, the material of the flexible support 71 is packing or rubber and other wear-resistant materials; the number of the flexible supports 71 is multiple. The flexible support innovatively adopts packing seal, which also reduces the pump body mud leakage line and improves the efficiency of the pump.

[0079] The material of the rigid support 72 is wear-resistant material to improve the service life, play an additional supporting role for the transmission shaft 4, and reduce the possibility of further deformation of the transmission shaft 4.

[0080] The embodiment of the present invention also provides a milling groove machine, including the milling groove machine drive system provided by any technical solution of the present invention.

[0081] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the protection scope of the present invention.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transmission system of a milling slot machine, characterized in that, it includes: a motor (1); a pump housing (2); a support cylinder (3), located between the motor (1) and the pump housing (2), and the support cylinder (3) is installed on the pump housing (2); the support cylinder (3) includes a cavity; a transmission shaft (4), installed in the cavity, and one end is drivingly connected to the motor (1); an impeller (5), located in the pump housing (2); the impeller (5) is drivingly connected to the other end of the transmission shaft (4); a support assembly (6), including a first support member (61) and a second support member (62); both the first support member (61) and the second support member (62) are installed in the cavity, the first support member (61) supports one end of the transmission shaft (4), and the second support member (62) supports the middle part of the transmission shaft (4); and a floating support assembly (7), installed on the pump housing (2); the floating support assembly (7) includes a flexible support member (71) and a rigid support member (72); the flexible support member (71) abuts against the transmission shaft (4), and there is a set gap between the rigid support member (72) and the transmission shaft (4); the rigid support member (72) includes a first ring body (723) and a first protrusion (724), which are fixedly connected; the first protrusion (724) includes a second through hole (722); wherein, the floating support assembly (7) further includes: a pressing assembly (73), installed on the side of the rigid support member (72) away from the pump housing (2); and a locking ring (74), installed on the side of the pressing assembly (73) away from the rigid support member (72); the pressing assembly (73) includes: a second ring body (731), located between the locking ring (74) and the rigid support member (72); the second ring body (731) presses the first protrusion (724); and a second protrusion (732), fixed to the second ring body (731); at least a part of the second protrusion (732) is inserted into the second through hole (722) to press the flexible support member (71) located in the second through hole (722); wherein, a through hole (733) penetrates through the second ring body (731) and the second protrusion (732); the transmission shaft (4) is located in the through hole (733).

2. The transmission system of the milling slot machine according to claim 1, characterized in that, the rigid support member (72) is fixedly connected to the pump housing (2); the rigid support member (72) includes a first through hole (721) and a second through hole (722); the inner diameter dimension of the first through hole (721) is smaller than the inner diameter dimension of the second through hole (722); the second through hole (722) is located on the side of the first through hole (721) facing the motor (1); the transmission shaft (4) passes through the first through hole (721) and the second through hole (722); the flexible support member (71) is installed in the second through hole (722).

3. The milling groove machine transmission system according to claim 2, characterized in that, the first ring body (723) includes the first through hole (721).

4. The milling groove machine transmission system according to claim 3, characterized in that, the pressing component (73) is fixedly connected to the rigid support (72); the floating support assembly (7) further includes a locking member (75) for fixedly connecting the pressing component (73) and the locking ring (74).

5. The milling groove machine transmission system according to claim 1, characterized in that, the floating support assembly (7) further includes: a guide member (76), the pressing component (73), the locking ring (74) and the rigid support (72) are all provided with coaxially and communicating guide holes (70), and the guide member (76) is inserted into each of the guide holes (70); and a locking assembly (77) installed on the guide member (76) to fix the rigid support (72), the pressing component (73) and the locking ring (74).

6. The milling groove machine transmission system according to claim 5, characterized in that, the locking assembly (77) includes: an elastic member (771) sleeved on the part of the guide member (76) located outside the locking ring (74); a retaining sleeve (772) located on the side of the elastic member (771) away from the locking ring (74); and a nut (773) threadedly connected to the guide member (76) to fixedly connect both the pressing component (73) and the locking ring (74) to the rigid support (72).

7. The milling groove machine transmission system according to claim 1, characterized in that, the pressing component (73) includes a first pressing half-ring (734) and a second pressing half-ring (735); the first pressing half-ring (734) and the second pressing half-ring (735) are pieced together to form a ring.

8. The milling groove machine transmission system according to claim 1, characterized in that, the locking ring (74) includes a first locking half-ring (741) and a second locking half-ring (742), and the first locking half-ring (741) and the second locking half-ring (742) are pieced together to form a ring.

9. The milling groove machine transmission system according to claim 1, characterized in that, the pressing component (73) includes a first pressing half-ring (734) and a second pressing half-ring (735); the first pressing half-ring (734) and the second pressing half-ring (735) are pieced together to form a ring; the locking ring (74) includes a first locking half-ring (741) and a second locking half-ring (742), and the first locking half-ring (741) and the second locking half-ring (742) are pieced together to form a ring; the splicing surface of the first pressing half-ring (734) and the second pressing half-ring (735) is the first splicing surface; the splicing surface of the first locking half-ring (741) and the second locking half-ring (742) is the second splicing surface; the first splicing surface and the second splicing surface are staggered in the circumferential direction of the locking ring (74).

10. The milling groove machine transmission system according to claim 9, It is characterized in that the first splicing surface and the second splicing surface are staggered by 90° in the circumferential direction of the locking ring (74).

11. The milling groove machine transmission system according to claim 1, It is characterized in that further comprising a sealing assembly (8), which is installed on the transmission shaft (4) and is located on the side of the second support member (62) away from the first support member (61); the sealing assembly (8), the transmission shaft (4) and the support cylinder (3) together form a sealing cavity; the support assembly (6) is located in the sealing cavity; the sealing cavity is used for filling lubricating oil.

12. The milling groove machine transmission system according to claim 11, It is characterized in that the sealing assembly (8) includes a sealing ring.

13. The milling groove machine transmission system according to claim 1, It is characterized in that the flexible support member (71) includes packing; the number of the flexible support members (71) is multiple.

14. The milling groove machine transmission system according to claim 1, It is characterized in that further comprising a protection cylinder (9), which is sleeved outside the transmission shaft (4) and is fixedly connected to the transmission shaft (4).

15. The milling groove machine transmission system according to claim 1, It is characterized in that the set clearance is 1 mm to 3 mm.

16. A milling groove machine, It is characterized in that it includes the milling groove machine transmission system according to any one of claims 1 to 15.

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