Concrete piston limiting device and pumping mechanism

Abstract

The utility model discloses a concrete piston limiting device and a pumping mechanism in the field of pumping mechanisms, and aims to solve the problem that a limiting structure of a concrete piston assembly in the prior art affects the whole machine design, the concrete piston limiting device comprises a limiting sleeve and a baffle, the limiting sleeve is installed on a pumping main oil cylinder, one end of the limiting sleeve abuts against the concrete piston assembly, and the other end of the limiting sleeve abuts against the baffle. The other end of the stop collar abuts against a clamping groove type guide cover plate of the pumping main oil cylinder, the baffle is installed on the side wall of the water tank through a fixing pin, and one end of the baffle is clamped in a positioning hole of the stop collar; the water tank is simple in structure, only the mass of the limiting sleeve and the baffle is increased, the limiting sleeve is located on the pumping main oil cylinder in the water tank, the baffle is fixed to the side wall of the water tank, and the layout design of parts of the whole machine is not affected; the two ends of the limiting sleeve abut against clamping groove type cover plates on the concrete piston assembly and the pumping main oil cylinder respectively to limit abnormal retreating of the concrete piston assembly.

Description

Technical Field

[0001] This application relates to the field of pumping mechanisms, and particularly to a concrete piston limiting device and a pumping mechanism. Background Art

[0002] The pumping mechanism is the actuating mechanism of a pumping machine. A limiting device is provided inside the pumping structure. The limiting device is used for limiting the concrete piston assembly, preventing the abnormal withdrawal of the concrete piston assembly, and ensuring the normal operation of the concrete piston. There are the following several types of limiting mechanisms for the concrete piston assembly:

[0003] 1. Add a section of cylinder barrel at the tail of the main pumping cylinder, add a piston, and use the hydraulic oil enclosed inside the cylinder barrel to achieve the limitation of the concrete piston assembly;

[0004] 2. Add a connecting rod structure between the main pumping cylinder and the concrete piston assembly, increase the stroke of the main pumping cylinder, and achieve the limitation of the concrete piston assembly.

[0005] The above-mentioned limiting methods require a large number of additional structural parts, increasing the cost of the main pumping cylinder, increasing the weight of the cylinder, and being unfavorable for the lightweight and cost reduction design of the whole machine. Utility Model Content

[0006] The purpose of this application is to provide a concrete piston limiting device and a pumping mechanism. The structure of the concrete piston limiting device is simple, and the abnormal withdrawal of the concrete piston assembly is restricted by the groove-type cover plates at both ends of the limiting sleeve that respectively abut against the concrete piston assembly and the main pumping cylinder.

[0007] To solve the above technical problems, this application adopts the following technical solutions:

[0008] This application provides a concrete piston limiting device, including a limiting sleeve and a baffle. The limiting sleeve is installed on the main pumping cylinder arranged in a water tank. One end of the limiting sleeve abuts against the concrete piston assembly, and the other end abuts against the groove-type guiding cover plate of the main pumping cylinder. The baffle is installed on the inner side wall of the water tank through a fixing pin, and one end of the baffle is clamped in the positioning hole of the limiting sleeve;

[0009] The limiting sleeve is a cylindrical tube with an open end. A guiding chamfer is provided on the cross-section of the open end of the cylindrical surface. One end of the limiting sleeve is provided with an extended arc surface. A limiting protrusion and a limiting groove are provided on one surface of the extended arc surface. The limiting protrusion and the limiting groove cooperate with the groove-type guiding cover plate.

[0010] Optionally, the radian of the extended arc surface is less than 180°.

[0011] Optionally, the radian of the extended arc surface is greater than or equal to 180°, and guiding chamfers are provided on both cross-sections of the extended arc surface.

[0012] Optionally, a plurality of auxiliary holes are provided on the limiting sleeve.

[0013] Optionally, the fixing pin includes a stud and a positioning ring. The positioning ring is provided on the stud and divides the stud into an inner end and an outer end. The inner end is installed on the side wall of the water tank, the baffle is installed on the outer end, and a positioning pin stop is provided on the outer end.

[0014] Optionally, a retaining ring groove is provided on the outer end, and a retaining ring is provided in the retaining ring groove for axially limiting the baffle.

[0015] Optionally, any one of a double-nut structure or an open-pin structure is provided on the outer end for axially limiting the baffle.

[0016] Optionally, a guide hole and a baffle positioning stop are provided on the baffle. The baffle positioning stop is arranged in the positioning hole, and the guide hole is connected to the fixing pin.

[0017] Optionally, a part of the guide hole is a locking round hole for the locking function of the baffle when the limiting sleeve is disassembled.

[0018] In a second aspect, the present application provides a pumping mechanism, including a concrete piston assembly and a pumping main cylinder, and further including the concrete piston limiting device according to any one of the first aspect, where the concrete piston limiting device is installed on the pumping main cylinder to limit the withdrawal of the concrete piston assembly.

[0019] Compared with the prior art, the beneficial effects achieved by the present application are as follows:

[0020] The structure of the present utility model is simple. Only the quality of the limiting sleeve and the baffle is increased. The limiting sleeve is located on the pumping main cylinder inside the water tank, and the baffle is fixed on the side wall of the water tank, which does not affect the layout design of the whole machine parts. The abnormal withdrawal of the concrete piston assembly is restricted by the two ends of the limiting sleeve respectively abutting against the clamping groove covers on the concrete piston assembly and the pumping main cylinder. Description of the Drawings

[0021] Figure 1 is a schematic installation structure diagram of the concrete piston limiting device in an embodiment of the present application;

[0022] Figure 2 is a schematic structure diagram of the limiting sleeve in an embodiment of the present application;

[0023] Figure 3 is a schematic structure diagram of the fixing pin in an embodiment of the present application

[0024] Figure 4 is a schematic structure diagram of the baffle in an embodiment of the present application;

[0025] Figure 5Schematic diagram of the card slot type guiding cover plate structure in an embodiment of the present application;

[0026] Figure 6 Schematic diagram of the locking round hole structure on the baffle in an embodiment of the present application;

[0027] Figure 7 Schematic diagram of the extended arc surface structure on the limit sleeve in an embodiment of the present application;

[0028] Figure 8 Schematic diagram of the double nut structure and split pin structure used on the fixing pin in an embodiment of the present application;

[0029] Figure 9 Installation schematic diagram of the prior art related to the present application using the limit cylinder structure for limiting;

[0030] Figure 10 Installation schematic diagram of the prior art related to the present application using the connecting rod structure for limiting;

[0031] Explanation of reference numerals:

[0032] 1. Limit sleeve; 101. Positioning hole; 102. Extended arc surface; 103. Guiding chamfer; 104. Limit card slot; 105. Limit boss; 106. Auxiliary hole; 2. Baffle; 201. Guiding hole; 202. Baffle positioning stop; 203. Locking round hole; 3. Fixing pin; 301. Stud; 302. Positioning ring; 303. Positioning pin stop; 304. Retaining ring groove; 305. Double nut structure; 306. Split pin structure; 4. Pumping main cylinder; 401. Card slot type guiding cover plate; 402. Cover plate card slot; 403. Cover plate protrusion; 5. Concrete piston assembly; 6. Water tank; 7. Limit cylinder structure; 8. Connecting rod structure. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present application and its application or use.

[0034] As Figure 9 shown, in the prior art, the limit cylinder structure 7 is used to limit between the pumping main cylinder 4 and the concrete piston assembly 5. The limit structure 7 is added at the tail end of the pumping main cylinder, and the hydraulic oil that is not enclosed in the cylinder barrel of the limit cylinder structure 7 is used to realize the limit of the concrete piston assembly 5. Such a structure adds a relatively large cylinder barrel and a piston, increases the occupied space of the overall pumping mechanism, limits the reasonable design of other accessories, and also greatly increases the weight of the whole machine, which does not conform to the lightweight design of modern machinery.

[0035] As Figure 10 shown, a connecting rod can also be used for the limit between the pumping main cylinder 4 and the concrete piston assembly 5 in the prior art. A connecting rod structure 8 is added between the pumping main cylinder 4 and the concrete piston assembly 5 to increase the stroke of the pumping main cylinder 4 to achieve the limit of the concrete piston assembly 5. However, the connecting rod structure 8 increases the lateral occupancy of the pumping main cylinder 4, and has the same problem as the above-mentioned limit cylinder structure, which limits the reasonable design of other accessories of the whole machine and also greatly increases the weight of the whole machine, not meeting the lightweight design of modern machinery.

[0036] Embodiment 1

[0037] As Figures 1 - 7 shown, this embodiment provides a concrete piston limiting device, including a limiting sleeve 1 and a baffle 2. The limiting sleeve 1 is installed on the pumping main cylinder 4 arranged in a water tank 6. One end of the pumping main cylinder 4 connected to the concrete piston assembly 5 is arranged in the water tank 6. One end of the limiting sleeve 1 abuts against the concrete piston assembly 5, and the other end abuts against the groove-type guiding cover plate 401 of the pumping main cylinder 4. The baffle 2 is installed on the inner side wall of the water tank 6 through a fixing pin 3, and one end of the baffle 2 is clamped in the positioning hole 101 of the limiting sleeve 1.

[0038] The limiting sleeve 1 is a cylindrical tube with an open end. A guiding chamfer is provided on the cross-section of the open end of the cylindrical surface. The limiting sleeve 1 is inserted into the pumping main cylinder 4 from the open end of its cylindrical surface. When the guiding chamfer contacts the surface of the pumping main cylinder 4 during the insertion process of the limiting sleeve 1, since the contact surface between the two is relatively small and the surface of the pumping main cylinder 4 is a curved surface, after the guiding chamfer contacts the pumping main cylinder 4 and continues to apply force to the limiting sleeve 1, the guiding chamfer will deform towards the outer circumference of the pumping main cylinder 4, and the limiting sleeve 1 will fall and be inserted into the pumping main cylinder 4. The guiding chamfer can enable the limiting sleeve 1 to be quickly inserted into the pumping main cylinder 4. Since the guiding chamfer is provided on the cross-section of the open end of the cylindrical surface, the open end of the cylindrical surface of the limiting sleeve 1 can be greater than 180 degrees.

[0039] One end of the limiting sleeve 1 is provided with an extended arc surface 102. A limiting protrusion 105 and a limiting groove 104 are provided on one surface of the extended arc surface 102. The limiting protrusion 105 and the limiting groove 104 cooperate with the groove-type guiding cover plate 401.

[0040] The radian of the extended arc surface 102 is smaller than the radian of the end surface of the limit sleeve 1. During the installation process of the limit sleeve 1 and the extended arc surface 102, the opening on the limit sleeve 1 first contacts the pumping main cylinder 4, the limit sleeve 1 gradually drops towards the pumping main cylinder 4, and the extended arc surface 102 at the end of the limit sleeve 1 also gradually drops towards the direction of the clamping groove type guiding cover plate 401. The limit protrusions 105 and the limit clamping grooves 104 on the inner side surface of the extended arc surface 102 are in contact and cooperation with the clamping groove type guiding cover plate 401, and one end of the limit sleeve 1 away from the extended arc surface 102 contacts the concrete piston assembly, thereby realizing the limiting function of the concrete piston assembly 5.

[0041] When repairing the piston assembly, the limiting device needs to be removed, and the piston assembly is retracted into the water tank 6 for repair. The fixing pin 3 is disassembled from the inner side wall of the water tank 6, then the baffle plate 2 is taken out, and the limit sleeve 1 is taken off from the pumping main cylinder 4. At this time, the limit protrusions 105 and the limit clamping grooves 104 on the extended arc surface 102 are separated from the clamping groove type guiding cover plate 401, and the limit sleeve 1 and the extended arc surface 102 are taken out, completing the removal of the limiting device. The structure of this application is simple, does not occupy the space of the whole machine, and does not affect the lightweight and cost reduction design of the whole machine. Embodiment 2

[0042] Based on Embodiment 1, this embodiment provides a concrete piston limiting device. The difference from Embodiment 1 is that: the radian of the extended arc surface 102 can be less than 180°, or can be greater than or equal to 180°. When the radian is greater than or equal to 180°, guiding chamfers 103 are provided on both sections of the extended arc surface 102. When the radian of the extended arc surface 102 is set to be greater than or equal to 180°, when both ends of the opening of the extended arc surface contact the clamping groove type guiding cover plate 401, the guiding chamfers 103 contact the surface of the clamping groove type guiding cover plate 401. Continuing to apply force to the limit sleeve 1 towards the direction of the pumping main cylinder, the guiding chamfers 103 will deform towards the outer circumference of the clamping groove type guiding cover plate 401, so that the extended arc surface 102 is in contact and cooperation with the clamping groove type guiding cover plate 401.

[0043] The inner side of the extended arc surface 102 is provided with a limit clamping groove 104 and a limit protrusion 105. The limit clamping groove 104 is in contact and cooperation with the cover protrusion 403 on the clamping groove type guiding cover plate 401, and the limit protrusion 105 is in contact and cooperation with the cover clamping groove 402 on the clamping groove type guiding cover plate 401. Through the cooperation of the limit clamping groove 104 and the cover protrusion 403, and the cooperation of the limit protrusion 105 and the cover clamping groove 402, one end of the limit sleeve 1 provided with the extended arc surface 102 is firmly abutted against the clamping groove type guiding cover plate 401, and the other end is abutted against the concrete piston assembly 5, restricting the abnormal withdrawal of the concrete piston assembly 5.

[0044] The limit sleeve 1 is provided with a plurality of auxiliary holes 106. During the installation and disassembly process of the limit sleeve 1, the limit sleeve can be better taken through the auxiliary holes.

[0045] The baffle 2 is provided with a guiding hole 201 and a baffle positioning stop 202. The stud 301 of the fixing pin 3 passes through the guiding hole. The positioning stop 303 on the positioning pin 3 contacts the inner wall of the guiding hole 201, restricting the circumferential movement of the baffle 2 on the stud 301 and also preventing the rotation and loosening of the positioning pin 3. The baffle positioning stop 202 is inserted into the positioning hole 101 of the limiting sleeve 1. The baffle positioning stop 202 has a structure in which both sides at one end of the baffle 2 are retracted. After the baffle positioning stop 202 is inserted into the positioning hole 101, the movement of the limiting sleeve 1 away from the pumping main cylinder is restricted by the baffle 2. Since the baffle 2 is fixed, the circumferential rotational movement of the limiting sleeve 1 around the pumping main cylinder is restricted.

[0046] The guiding hole 201 of the baffle 2 is in the shape of a rounded rectangle, and one end of the rounded corner can be a locking round hole 203 larger than a semi-circle. When it is necessary to disassemble the limiting sleeve 1, lift the baffle 2 upward. The fixing pin 3 is located in the locking round hole 203, and the baffle positioning stop 202 at the end of the baffle 2 is separated from the positioning hole 101. The fixing pin 3 is arranged in the locking round hole 203, restricting the downward fall of the baffle 2 towards the limiting sleeve 1, and then the limiting sleeve 1 can be taken out.

[0047] The fixing pin 3 includes a stud 301 and a positioning ring 302. The positioning ring 302 is arranged on the stud 301, dividing the stud 301 into two parts. One end is arranged on the inner side wall of the water tank 6, and the other end passes through the guiding hole 201 on the baffle 2. The end passing through the guiding hole 201 can restrict the movement of the baffle 2 through a retaining ring in the retaining ring groove 304 on the stud 301.

[0048] As Figure 8 shown, a double-nut structure 305 can also be arranged at one end of the stud for fixing the baffle 2 to restrict the movement of the baffle. When the double-nut structure 305 is arranged for restriction, threads matching the nuts need to be opened on the stud. In addition, an open-pin structure 306 can also be arranged on the stud to restrict the movement of the baffle 2. When the open-pin structure 306 is arranged for restriction, an opening matching the open pin needs to be opened on the stud 301.

[0049] Embodiment 3

[0050] Based on Embodiment 1 or Embodiment 2, this embodiment provides a pumping mechanism, including a concrete piston assembly 5 and a pumping main cylinder 4, and the concrete piston limiting device provided in Embodiment 1 or Embodiment 2. The concrete piston limiting device is installed on the pumping main cylinder 4 to limit the withdrawal of the concrete piston assembly 5.

[0051] Using the concrete piston limiting device provided in this application only increases the weight of the limiting sleeve 1 and the baffle 2, and the increased weight is relatively small. The limiting sleeve 1 and the baffle 2 are installed in the water tank 6 without occupying the space of other structures and do not affect the design of the whole machine's accessories.

[0052] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A concrete piston limiting device, characterized in that, It includes a limit sleeve and a baffle. The limit sleeve is installed on the main pumping cylinder arranged in the water tank. One end of the limit sleeve abuts against the concrete piston assembly, and the other end abuts against the grooved guide cover plate of the main pumping cylinder. The baffle is installed on the inner side wall of the water tank through a fixing pin, and one end of the baffle is clamped in the positioning hole of the limit sleeve. The limit sleeve is a cylindrical tube with an open end. A guiding chamfer is provided on the cross-section of the open end of the cylindrical surface. One end of the limit sleeve is provided with an extended arc surface. A limit protrusion and a limit groove are provided on one surface of the extended arc surface. The limit protrusion and the limit groove cooperate with the grooved guide cover plate.

2. The concrete piston limiting device according to claim 1, characterized in that, The radian of the extended arc surface is less than 180°.

3. The concrete piston limiting device according to claim 1, characterized in that, The radian of the extended arc surface is greater than or equal to 180°, and guiding chamfers are provided on the two cross-sections of the extended arc surface.

4. The concrete piston limiting device according to claim 1, characterized in that A plurality of auxiliary holes are provided on the limit sleeve.

5. The concrete piston limiting device according to claim 1, characterized in that, The fixing pin includes a stud and a positioning ring. The positioning ring is provided on the stud. The positioning ring divides the stud into an inner end and an outer end. The inner end is installed on the side wall of the water tank, and the baffle is installed on the outer end. A positioning pin stop is provided on the outer end.

6. The concrete piston limiting device according to claim 5, wherein, A retaining ring groove is provided on the outer end, and a retaining ring is provided in the retaining ring groove. The retaining ring is used for axially limiting the baffle.

7. The concrete piston limiting device according to claim 5, characterized in that, Either a double-nut structure or a split pin structure is provided on the outer end for axially limiting the baffle.

8. The concrete piston limiting device according to claim 1, characterized in that, A guiding hole and a baffle positioning stop are provided on the baffle. The baffle positioning stop is arranged in the positioning hole, and the guiding hole is connected to the fixing pin.

9. The concrete piston limiting device according to claim 8, wherein, Part of the guiding hole is a locking round hole, and the locking round hole is used for the locking function of the baffle when the limit sleeve is disassembled.

10. A pumping mechanism, comprising a concrete piston assembly and a main pumping oil cylinder, characterized in that, It also includes the concrete piston limiting device according to any one of claims 1-9. The concrete piston limiting device is installed on the main pumping cylinder to limit the withdrawal of the concrete piston assembly.

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