Protection device for pilot pump, pilot pump and excavator

Abstract

The utility model discloses a protection device for a pilot pump, the pilot pump and an excavator, the protection device for the pilot pump comprises a protection seat and a mounting frame assembly, and the protection seat can cover a pump disc of the pilot pump; the mounting frame assembly comprises a first mounting frame and a second mounting frame, the first mounting frame and the second mounting frame are arranged in one-to-one correspondence with two extension plate parts oppositely extending out of a pump disc of the pilot pump, and the first mounting frame and the second mounting frame are arranged on the sides, away from the protection base, of the corresponding extension plate parts and detachably connected with the protection base; therefore, the mounting frame assembly and the protection seat oppositely clamp the pump disc, and the protection device can be mounted under the condition that the pilot pump is not provided with a reserved mounting hole.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of excavators, and particularly relates to a protection device for a pilot pump, a pilot pump and an excavator. BACKGROUND

[0002] An excavator is an important device widely used in engineering construction, mine exploitation and infrastructure construction, and a complex hydraulic system is included in the design of the excavator to ensure efficient and accurate operation. The excavator is equipped with a main pump, and the main function of the main pump is to provide hydraulic power, which serves as the core power source of the excavator and supports the realization of various operation functions. A pilot pump is arranged on the main pump, and the pilot pump can provide power for hydraulic valves to control the hydraulic valves.

[0003] One side of the pilot pump arranged on the main pump is provided with a door plate. According to the demand of the African gold mine market, the pilot pump of the excavator needs to be provided with a protection device to prevent trees and the like from impacting the door plate and causing the door plate to move inward, thereby causing the door plate to collide with the pilot pump or the main pump. The existing protection device for the pilot pump needs to pre-drill a mounting hole on the pilot pump to realize the installation of the protection device. For the pilot pump without a reserved mounting hole, the installation of the protection device cannot be performed. CONTENT OF THE UTILITY MODEL

[0004] In view of the above defects or deficiencies, the application provides a protection device for a pilot pump, a pilot pump and an excavator, aiming to solve the technical problem that the pilot pump without a reserved mounting hole cannot be installed with a protection device.

[0005] In order to achieve the above purpose, the application provides a protection device for a pilot pump, wherein the protection device for the pilot pump comprises a protection seat and a mounting rack assembly. The protection seat can cover the pump disc of the pilot pump. The mounting rack assembly comprises a first mounting rack and a second mounting rack. The first mounting rack and the second mounting rack are respectively arranged in correspondence with two extension plate parts arranged opposite to the pump disc of the pilot pump, and the first mounting rack and the second mounting rack are arranged on the side of the corresponding extension plate part away from the protection seat, and are detachably connected with the protection seat, so that the mounting rack assembly and the protection seat clamp the pump disc.

[0006] In the embodiment of the application, the first mounting rack and the second mounting rack each comprise an abutment plate and two connecting columns connected with the abutment plate. The abutment plate is used to abut the side of the corresponding extension plate part away from the protection seat. The two connecting columns are arranged in correspondence with the extension plate part. The connecting column is detachably connected with the protection seat through a fastener.

[0007] In the embodiment of the application, the protection seat is provided with a connecting hole corresponding to the position of the connecting column, and the connecting column is provided with a threaded hole. The fastener is a bolt, and the fastener is threadedly connected with the hole wall of the connecting hole and the threaded hole.

[0008] In the embodiment of the present application, the thickness dimension of the connecting column is smaller than the thickness dimension of the epitaxial plate part.

[0009] In the embodiment of the present application, the abutment plate comprises a main plate part and a folded plate part, the main plate part is used for abutting against the side of the corresponding epitaxial plate part away from the protection seat, and the main plate part is connected with the connecting column, and the folded plate part is connected with the main plate part and is arranged in a folded manner towards the direction close to the protection seat to cover the epitaxial plate part.

[0010] In the embodiment of the present application, the protection seat comprises a protection plate, an intermediate plate and a lengthening column arranged between the protection plate and the intermediate plate, and two ends of the intermediate plate are respectively and one-to-one detachably connected with the first mounting frame and the second mounting frame.

[0011] In the embodiment of the present application, the first mounting frame and the second mounting frame each have two connection points detachably connected with the intermediate plate, and the epitaxial plate part is located between the two connection points on the corresponding mounting frame.

[0012] The number of the lengthening columns is three, one of which is located between the two connection points of one of the mounting frames, and the other two are respectively and one-to-one arranged outside the corresponding connection points of the other mounting frame.

[0013] In the embodiment of the present application, one of the protection plate and the intermediate plate is fixedly connected with the lengthening column, and the other of the protection plate and the intermediate plate is detachably connected with the lengthening column.

[0014] In the embodiment of the present application, a plurality of weight-reducing holes are arranged at intervals on the protection plate.

[0015] In the embodiment of the present application, a positioning pin is arranged on the intermediate plate, and the positioning pin is used for being inserted into a positioning hole of the pilot pump.

[0016] In the embodiment of the present application, a limiting hole is arranged in the middle of the intermediate plate, and the limiting hole is used for being sleeved outside a limiting ring of the pilot pump; the number of the lengthening columns is at least two, and the at least two lengthening columns are arranged around the limiting hole.

[0017] In addition, the present application also provides a pilot pump, which comprises the protection device for the pilot pump as described above.

[0018] In addition, the present application also provides an excavator, which comprises the pilot pump as described above.

[0019] Through the above technical solution, the protection device for the pilot pump provided by the embodiment of the present application has the following beneficial effects:

[0020] The protection seat covers the right side of the pump disc of the pilot pump and is used for protecting the pilot pump. When the door plate collides with the pilot pump in an unexpected situation, the protection seat can stop the door plate and replace the pilot pump to collide with the door plate, so as to avoid the direct collision between the door plate and the pilot pump, thereby protecting the pilot pump and ensuring the normal use of the excavator.

[0021] The pump disc of the pilot pump has two extension plate parts arranged oppositely, and the first mounting frame and the second mounting frame are arranged one by one corresponding to the two extension plate parts. In addition, the first mounting frame and the second mounting frame are arranged on the side of the corresponding extension plate part away from the protection seat, that is, the mounting frame assembly and the protection seat are respectively located on the left and right sides of the extension plate part. The first mounting frame and the second mounting frame are detachably connected with the protection seat, so that the mounting frame assembly and the protection seat can be clamped towards the pump disc, and the friction force between the mounting frame assembly, the protection seat and the pump disc is used to fix the protection device on the pump disc of the pilot pump, prevent the protection seat from falling off the pump disc, and realize the installation of the protection device without reserving the mounting hole in the pilot pump.

[0022] Other features and advantages of the embodiments of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the embodiments of the present application together with the following detailed description, but do not constitute a limitation of the embodiments of the present application. For those skilled in the art, other drawings can be obtained from the structures shown in the drawings without creative labor. In the drawings:

[0024] Figure 1 is an exploded structural schematic view of the protection device for the pilot pump according to an embodiment of the present application;

[0025] Figure 2 is a structural schematic view of the pilot pump according to an embodiment of the present application from one perspective;

[0026] Figure 3 is a structural schematic view of the pilot pump according to an embodiment of the present application from another perspective;

[0027] Figure 4 is a structural schematic view of the first mounting frame of the protection device for the pilot pump according to an embodiment of the present application from one perspective;

[0028] Figure 5 is a structural schematic view of the first mounting frame of the protection device for the pilot pump according to an embodiment of the present application from another perspective;

[0029] Figure 6is a schematic view of a connection structure of a protection device for a pilot pump and the pilot pump according to an embodiment of the present application;

[0030] Figure 7 is a schematic view of a structure of an intermediate plate of a protection device for a pilot pump according to an embodiment of the present application.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 10 protection seat 2111 main plate part

[0033] 11 protection plate 2112 folded plate part

[0034] 111 weight-reducing hole 212 connecting column

[0035] 12 intermediate plate 2121 threaded hole

[0036] 121 positioning pin 213 fastener

[0037] 122 limiting hole 22 second mounting bracket

[0038] 123 connecting hole 30 pilot pump

[0039] 124 ear plate part 31 pump disc

[0040] 13 lengthening column 311 outer extension plate part

[0041] 20 mounting bracket assembly 312 positioning hole

[0042] 21 first mounting bracket 313 limiting ring

[0043] 211 abutting plate DETAILED DESCRIPTION

[0044] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0045] The protection device for a pilot pump of the present application will be described below with reference to the accompanying drawings.

[0046] As Figures 1 to 7As shown, the application provides a protection device for a pilot pump, wherein the protection device for the pilot pump comprises a protection seat 10 and a mounting rack assembly 20. The protection seat 10 can cover the pump disc 31 of the pilot pump 30. The mounting rack assembly 20 comprises a first mounting rack 21 and a second mounting rack 22. The first mounting rack 21 and the second mounting rack 22 are respectively arranged corresponding to the two outwardly extending plate parts 311 of the pump disc 31 of the pilot pump 30, and the first mounting rack 21 and the second mounting rack 22 are arranged on the side of the corresponding outwardly extending plate part 311 away from the protection seat 10, and are detachably connected with the protection seat 10, so that the mounting rack assembly 20 and the protection seat 10 can clamp the pump disc 31.

[0047] As shown, Figure 1 , the protection seat 10 covers the right side of the pump disc 31 of the pilot pump 30, and the protection seat 10 is used to protect the pilot pump 30. When the door plate collides with the pilot pump 30 in an unexpected situation, the protection seat 10 can stop the door plate and replace the pilot pump 30 to collide with the door plate, so as to avoid the direct collision between the door plate and the pilot pump 30, thereby protecting the pilot pump 30 and ensuring the normal use of the excavator.

[0048] The pump disc 31 of the pilot pump 30 has two outwardly extending plate parts 311, and the first mounting rack 21 and the second mounting rack 22 are respectively arranged corresponding to the two outwardly extending plate parts 311. In addition, the first mounting rack 21 and the second mounting rack 22 are arranged on the side of the corresponding outwardly extending plate part 311 away from the protection seat 10, that is, the mounting rack assembly 20 and the protection seat 10 are respectively arranged on the left and right sides of the outwardly extending plate part 311. The first mounting rack 21 and the second mounting rack 22 are detachably connected with the protection seat 10, so that the mounting rack assembly 20 and the protection seat 10 can clamp the pump disc 31. The protection device can be fixed on the pump disc 31 of the pilot pump 30 by the friction between the mounting rack assembly 20 and the protection seat 10 and the pump disc 31, so as to prevent the protection seat 10 from falling off the pump disc 31, and the protection device can be installed even if there is no mounting hole reserved for the pilot pump 30.

[0049] Specifically, the first mounting rack 21 and the second mounting rack 22 can be detachably connected with the protection seat 10 by bolts, rivets, buckles or other structures.

[0050] In the embodiment of the application, please refer to Figure 1 , Figure 4 and Figure 5 , the first mounting rack 21 and the second mounting rack 22 each comprise an abutting plate 211 and two connecting columns 212 connected with the abutting plate 211. The abutting plate 211 is used to abut against the side of the corresponding outwardly extending plate part 311 away from the protection seat 10, and the two connecting columns 212 are arranged corresponding to the outwardly extending plate part 311. The connecting column 212 is detachably connected with the protection seat 10 by a fastener 213.

[0051] The first mounting frame 21 and the second mounting frame 22 each comprise an abutting plate 211 for abutting with the left side of the corresponding epitaxial plate part 311, and two connecting columns 212. The two connecting columns 212 are connected with the abutting plate 211, and are arranged at intervals corresponding to the epitaxial plate part 311, that is, the two connecting columns 212 are respectively located at the front and back sides of the corresponding epitaxial plate part 311, so that the force on the epitaxial plate part 311 is more uniform. The connecting column 212 is detachably connected with the protection seat 10 by a fastener 213, so that the abutting plate 211 and the protection seat 10 clamp the pump disc 31 from opposite sides, thereby fixing the protection device on the pump disc 31 of the pilot pump 30.

[0052] In the embodiments of the present application, please refer to Figure 1 、 Figure 4 and Figure 5 , the protection seat 10 is provided with a connecting hole 123 corresponding to the position of the connecting column 212, the connecting column 212 is provided with a threaded hole 2121, and the fastener 213 is a bolt, which is threadedly connected with the hole wall of the connecting hole 123 and the threaded hole 2121.

[0053] The protection seat 10 is provided with a connecting hole 123 corresponding to the position of the connecting column 212. The connecting column 212 is provided with a threaded hole 2121, and the fastener 213 is a bolt, which has the advantages of easy material selection and convenient installation. The fastener 213 is threadedly connected with the hole wall of the connecting hole 123 and the threaded hole 2121, and the threaded connection has a self-locking function, so that the connection between the protection seat 10 and the connecting column 212 is more stable and reliable.

[0054] On this basis, please refer to Figure 3 、 Figure 5 and Figure 6 , the thickness dimension of the connecting column 212 is less than the thickness dimension of the epitaxial plate part 311. As shown in Figure 5 , the thickness dimension of the connecting column 212 is a, and as shown in Figure 3 , the thickness dimension of the epitaxial plate part 311 is b. Compared with the thickness dimension of the connecting column 212 being greater than or equal to the thickness dimension of the epitaxial plate part 311, when the thickness dimension of the connecting column 212 is less than the thickness dimension of the epitaxial plate part 311, that is, a < b, after the bolt is tightened, as shown in Figure 6 , a gap g is formed between the protection seat 10 and the connecting column 212, and the static friction between the right side of the protection seat 10 and the pump disc 31 and the left side of the abutting plate 211 and the pump disc 31 is greater, which can ensure that the protection seat 10 and the abutting plate 211 can clamp the pump disc 31 after being fastened together, preventing the protection seat 10 and the abutting plate 211 from being disconnected from the pump disc 31 due to vibration.

[0055] It can be understood that g is about equal to 1mm, so that the static friction force between the protection seat 10 and the right side of the pump disc 31, and the left side of the pump disc 31 and the abutment plate 211 is large. g can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm.

[0056] In the embodiments of the present application, please refer to Figure 1 、 Figure 4 and Figure 5 , the abutment plate 211 includes a main plate part 2111 and a folded plate part 2112, the main plate part 2111 is used to abut against the side of the corresponding extension plate part 311 away from the protection seat 10, and the main plate part 2111 is connected with the connecting column 212, the folded plate part 2112 is connected with the main plate part 2111 and is arranged in a bent manner towards the direction close to the protection seat 10 to cover the extension plate part 311.

[0057] The main plate part 2111 is used to abut against the left side of the corresponding extension plate part 311, and the main plate part 2111 is used to install the connecting column 212. The folded plate part 2112 is connected with the main plate part 2111 away from the side of the pilot pump 30, and the folded plate part 2112 is arranged in a bent manner towards the direction close to the protection seat 10 to cover the extension plate part 311, so that the appearance of the pilot pump 30 is more beautiful, and the structure strength of the abutment plate 211 is higher and the ability to resist deformation is stronger by arranging the main plate part 2111 and the folded plate part 2112.

[0058] In the embodiments of the present application, please refer to Figure 1 , the protection seat 10 includes a protection plate 11, an intermediate plate 12 and an elongated column 13 arranged between the protection plate 11 and the intermediate plate 12, and the two ends of the intermediate plate 12 are respectively and one by one detachably connected with the first mounting frame 21 and the second mounting frame 22.

[0059] The protection plate 11 can stop the door plate and replace the pilot pump 30 to collide with the door plate, by arranging the protection plate 11 on the side of the pilot pump 30 close to the door plate, the door plate and the pilot pump 30 are prevented from colliding and damaging each other when the door plate moves inward under the action of external force, the door plate and the pilot pump 30 can be better protected to ensure the normal use of the excavator. The protection plate 11 can be parallel to the door plate, when the door plate moves towards the protection plate 11 under the action of external force, the door plate and the protection plate 11 are in surface-to-surface contact, the contact area is increased, so that the collision energy can be more dispersed, and the door plate and the pilot pump 30 can be better protected.

[0060] The intermediate plate 12 covers the pump disc 31, and the upper and lower ends of the intermediate plate 12 are respectively and one by one detachably connected with the first mounting frame 21 and the second mounting frame 22, and the intermediate plate 12 and the mounting frame assembly 20 clamp the pump disc 31 towards each other. The lengthening column 13 is located between the protection plate 11 and the intermediate plate 12, and the distance between the protection plate 11 and the pump disc 31 is increased by arranging the lengthening column 13, so that when the protection plate 11 is impacted, the distance of the buffer can be increased, and the door plate is prevented from directly impacting the pilot pump 30, so that the protection effect of the protection device is better.

[0061] In the embodiment of the present application, one of the protection plate 11 and the intermediate plate 12 is fixedly connected with the lengthening column 13, and the other of the protection plate 11 and the intermediate plate 12 is detachably connected with the lengthening column 13.

[0062] As shown in Figure 1 , the intermediate plate 12 is fixedly connected with the lengthening column 13, and the protection plate 11 is detachably connected with the lengthening column 13, so that the protection plate 11 can be replaced after being worn, and the use of the protection plate 11 is more flexible and convenient. Specifically, the protection plate 11 and the lengthening column 13 can be detachably connected through bolts, the bolts have the advantages of easy material selection and convenient installation, and the threaded connection can realize self-locking, so that the connection between the protection plate 11 and the lengthening column 13 is more stable and reliable.

[0063] In another embodiment, the protection plate 11 can be fixedly connected with the lengthening column 13, and the intermediate plate 12 can be detachably connected with the lengthening column 13, so that the protection plate 11 can be replaced after being worn.

[0064] In the embodiment of the present application, please refer to Figure 1 , the first mounting frame 21 and the second mounting frame 22 each have two connection points detachably connected with the intermediate plate 12, and the extension plate part 311 is located between the two connection points on the corresponding mounting frame; the number of lengthening columns 13 is three, one of which is located between the two connection points of one of the mounting frames 22, and the other two lengthening columns 13 are respectively and one by one arranged outside the two connection points of the other mounting frame 21.

[0065] It can be understood that the connection point can be the connection column 212 described above. In order to facilitate the description, the connection point is taken as the connection column 212 for description. In other embodiments, the connection point can also be a hole, a buckle or other structures. The first mounting frame 21 is provided with an extension plate part 311 extending downward, and the second mounting frame 22 is provided with an extension plate part 311 extending upward. The first mounting frame 21 and the second mounting frame 22 each have two connection columns 212 for detachable connection with the intermediate plate 12. In addition, the two connection columns 212 on the same mounting frame are spaced apart from the corresponding extension plate part 311, that is, the extension plate part 311 is located between the two connection columns 212 on the corresponding mounting frame, so that the stress of the extension plate part 311 is more uniform.

[0066] The number of the lengthening columns 13 is three, and the three lengthening columns 13 form a triangle, so that the stress of the protection plate 11 and the intermediate plate 12 is more uniform. Figure 1 As shown in the figure, one of the lengthening columns 13 is located between the two connection columns 212 of the second mounting frame 22, so that the stress of the intermediate plate 12 is more uniform. The other two lengthening columns 13 are respectively arranged corresponding to the two connection columns 212 of the first mounting frame 21 and located outside the corresponding connection columns 212. The lengthening column 13 is away from the pilot pump 30 relative to the connection column 212, so that the lengthening column 13 avoids the pilot pump 30 and avoids interference between the lengthening column 13 and the pilot pump 30.

[0067] In another embodiment, one of the lengthening columns 13 can be located between the two connection columns 212 of the first mounting frame 21, and the other two lengthening columns 13 are respectively arranged corresponding to the two connection columns 212 of the second mounting frame 22 and located outside the corresponding connection columns 212.

[0068] Please refer to Figure 7 , two corners of the lower end of the intermediate plate 12 are relatively far away from the inclined and outwardly extending ear plate part 124, which is used for installing the other two lengthening columns 13.

[0069] In the embodiment of the present application, please refer to Figure 1 , the protection plate 11 is provided with a plurality of weight reduction holes 111 arranged at intervals, so as to reduce the weight of the protection plate 11, so that the weight of the pilot pump 30 is lighter.

[0070] In the embodiment of the present application, please refer to Figure 1 , the intermediate plate 12 is provided with a positioning pin 121, which is used for being inserted into the positioning hole 312 of the pilot pump 30.

[0071] The positioning pin 121 extends in the left-right direction and is located between the two connecting columns 212 of the second mounting frame 22, and is used to be inserted into the positioning hole 312 of the pilot pump 30. By matching the positioning pin 121 with the positioning hole 312, the mounting position of the intermediate plate 12 is determined, and the connection between the intermediate plate 12 and the pump disc 31 is more stable and reliable.

[0072] In the embodiments of the present application, please refer to Figure 1 The middle part of the intermediate plate 12 is provided with a limiting hole 122, which is used to be sleeved outside the limiting ring 313 of the pilot pump 30; and the number of the elongated columns 13 is at least two, which are arranged around the limiting hole 122.

[0073] The limiting hole 122 is located in the middle part of the intermediate plate 12 and is used to be sleeved outside the limiting ring 313 of the pilot pump 30. By matching the limiting hole 122 with the limiting ring 313, the intermediate plate 12 is limited, the shaking of the intermediate plate 12 is reduced, and the connection stability between the intermediate plate 12 and the pump disc 31 is further improved. The at least two elongated columns 13 are arranged around the limiting hole 122, so that the stress of the intermediate plate 12 is more uniform.

[0074] The following describes the installation process of the protection device for the pilot pump in the present application:

[0075] First, the positioning pin 121 on the intermediate plate 12 is inserted into the positioning hole 312 on the pilot pump 30, and the intermediate plate 12 is tightly abutted with the right side surface of the pump disc 31.

[0076] Then, the abutment plate 211 of the first mounting frame 21 and the second mounting frame 22 is tightly abutted with the left side surface of the pump disc 31, and the first mounting frame 21 and the second mounting frame 22 are tightly mounted with the intermediate plate 12 through the fastening piece 213.

[0077] After the first mounting frame 21, the second mounting frame 22 and the intermediate plate 12 are installed, the protection plate 11 can be installed on the elongated column 13 connected with the intermediate plate 12.

[0078] The protection device for the pilot pump in the present application has the following advantages:

[0079] ①Simple structure, pure mechanical structure, low cost.

[0080] ②Easy to assemble, easy to disassemble during maintenance.

[0081] ③High reliability, can effectively protect the pilot pump 30, avoid causing large economic losses, and solve the problem that the protection device can be installed when there is no mounting hole on the pilot pump 30 disc.

[0082] In addition, the application further provides a pilot pump comprising the protection device for the pilot pump as described above. Since the pilot pump adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0083] In addition, the application further provides an excavator comprising the pilot pump as described above. Since the excavator adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0084] In the description of the application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0085] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0086] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0087] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A protection device for a pilot pump, characterized in that The protection device comprises: A protection seat (10) is arranged to cover a pump disc (31) of a pilot pump (30); A mounting frame assembly (20) comprises a first mounting frame (21) and a second mounting frame (22), the first mounting frame (21) and the second mounting frame (22) are arranged in one-to-one correspondence with two extension plate portions (311) of the pump disc (31) of the pilot pump (30) arranged opposite, and the first mounting frame (21) and the second mounting frame (22) are arranged on the side of the corresponding extension plate portion (311) away from the protection seat (10) and are detachably connected with the protection seat (10), so that the mounting frame assembly (20) and the protection seat (10) clamp the pump disc (31) towards each other.

2. The protection device for a pilot pump according to claim 1, characterized in that, The first mounting frame (21) and the second mounting frame (22) each comprise an abutment plate (211) and two connecting columns (212) connected with the abutment plate (211), the abutment plate (211) is used to abut with the side of the corresponding extension plate portion (311) away from the protection seat (10), and the two connecting columns (212) are arranged at intervals corresponding to the extension plate portion (311), and the connecting column (212) is detachably connected with the protection seat (10) through a fastener (213).

3. The protection device for a pilot pump according to claim 2, characterized in that, The protection seat (10) is provided with a connecting hole (123) corresponding to the position of the connecting column (212), the connecting column (212) is provided with a threaded hole (2121), and the fastener (213) is a bolt, the fastener (213) is threadedly connected with the hole wall of the connecting hole (123) and the threaded hole (2121).

4. The protection device for a pilot pump according to claim 2, characterized in that, The thickness dimension of the connecting column (212) is smaller than the thickness dimension of the extension plate portion (311).

5. The protection device for a pilot pump according to claim 2, characterized in that, The abutment plate (211) comprises a main plate portion (2111) and a folded plate portion (2112), the main plate portion (2111) is used to abut with the side of the corresponding extension plate portion (311) away from the protection seat (10), and the main plate portion (2111) is connected with the connecting column (212), and the folded plate portion (2112) is connected with the main plate portion (2111) and is arranged to be bent towards the protection seat (10) to cover the extension plate portion (311).

6. The protection device for a pilot pump according to any one of claims 1 to 5, characterized in that, The protection seat (10) comprises a protection plate (11), an intermediate plate (12), and an elongated column (13) arranged between the protection plate (11) and the intermediate plate (12), and two ends of the intermediate plate (12) are detachably connected with the first mounting frame (21) and the second mounting frame (22) in one-to-one correspondence.

7. The protection device for a pilot pump according to claim 6, characterized in that The first mounting frame (21) and the second mounting frame (22) each have two connecting points detachably connected with the intermediate plate (12), and the extension plate portion (311) is located between the two connecting points on the corresponding mounting frame; The number of the lengthening columns (13) is three, one of which is located between two of the connecting points of one of the mounting racks, and the other two are respectively arranged corresponding to the two connecting points of the other mounting rack and located outside the corresponding connecting points.

8. The protection device for a pilot pump according to claim 6, characterized in that, One of the protection plate (11) and the intermediate plate (12) is fixedly connected with the lengthening column (13), and the other is detachably connected with the lengthening column (13); and / or, A plurality of weight-reducing holes (111) are arranged on the protection plate (11); and / or, A positioning pin (121) is arranged on the intermediate plate (12), which is used for being inserted into the positioning hole (312) of the pilot pump (30); and / or, A limiting hole (122) is arranged in the middle of the intermediate plate (12), which is used for being sleeved outside the limiting ring (313) of the pilot pump (30); and the number of the lengthening columns (13) is at least two, and at least two lengthening columns (13) are arranged around the limiting hole (122).

9. A pilot pump characterized by, The pilot pump (30) comprises the protection device for the pilot pump according to any one of claims 1-8.

10. An excavator characterized by comprising: The excavator comprises the pilot pump (30) according to claim 9. The excavator comprises the pilot pump (30) according to claim 9.

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