Piston rod of double-outlet-rod oil cylinder

Abstract

A key groove is formed in the piston rod in the circumferential direction, a woodruff key is embedded in the key groove in a matched mode, a sleeve is arranged on the outer side of the woodruff key in a sleeved mode, semi-pistons are arranged at the two ends of the sleeve in a sleeved mode, and fasteners are installed on the semi-pistons in the radial direction. The fastener compresses the sleeve so that the sleeve can be compressed on the woodruff key, and an inner hole of the semi-piston is in contact positioning with the end face of the woodruff key. By means of the mode, the piston rod of the double-outlet-rod oil cylinder is easy to machine, rapid to assemble, accurate in piston assembling position, easy to replace parts and capable of reducing use cost.

Description

Technical Field

[0001] The utility model relates to the field of oil cylinders, in particular to a piston rod of a double-rod oil cylinder. Background Art

[0002] Common double-rod cylinder piston structure, the connection methods of piston and piston rod include piston and piston rod integrated structure, piston and piston rod split threaded connection, piston and piston rod expansion connection.

[0003] like Figure 3 The integrated structure of the piston and piston rod is processed by integral forging blank. The performance of the integrated structure is good, but due to its large processing volume and high cost, it is only suitable for small batches of cylinders with smaller cylinder rod diameters.

[0004] like Figure 4 The split threaded connection between the piston and the piston rod reduces the machining cost for the integrated structure. However, because the piston rod is long, the anti-loosening holes at the threaded connection between the piston and the piston rod are not convenient for machine tool processing, and the manual drilling efficiency in the workshop is low. In addition, due to the assembly and punching anti-loosening method, the piston needs to be purchased as a whole once the piston rod is damaged, and the price of customer accessories is relatively expensive.

[0005] like Figure 5 The expansion joint between the piston and the piston rod requires the piston and the piston rod to be connected by thermal expansion. The matching tolerance between the piston and the piston rod is difficult to determine. If the gap is too small, it will be impossible to assemble. If the gap is too large, the piston will move on the piston rod under the influence of oil pressure, which cannot meet the customer's stroke requirements. Summary of the invention

[0006] The main technical problem solved by the utility model is to provide a piston rod of a double-rod oil cylinder, which has simple machining, quick assembly, accurate piston assembly position, easy replacement of parts and reduces use cost.

[0007] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a piston rod of a double-rod oil cylinder, a key groove is opened on the circumference of the piston rod, a semicircular key is embedded in the key groove, a sleeve is sleeved on the outer side of the semicircular key, half pistons are sleeved on both ends of the sleeve, fasteners are installed in the radial direction of the half piston, the fasteners press the sleeve so as to press the sleeve on the semicircular key, and the inner hole of the half piston contacts and is positioned with the end face of the semicircular key.

[0008] In a preferred embodiment of the utility model, the semicircular key protrudes from the surface of the piston rod in the radial direction, the semicircular key and the piston rod form a step structure, and the end surface of the inner hole of the semi-piston is in contact with the step structure for positioning.

[0009] In a preferred embodiment of the present invention, the sleeve is a threaded sleeve, and the semi-piston is threadedly connected to the sleeve.

[0010] In a preferred embodiment of the utility model, the semi-piston has a threaded hole, the fastener is threadedly connected in the threaded hole, and the lower end of the fastener presses the sleeve.

[0011] In a preferred embodiment of the present invention, the length of the sleeve is less than or equal to the length of the semicircular key.

[0012] In a preferred embodiment of the present invention, a gap is set between the inner hole end surface of the half piston and the sleeve.

[0013] In a preferred embodiment of the present invention, the middle portion of the sleeve has a raised portion, the raised portion is raised radially, and a gap is provided between the raised portion and the half piston.

[0014] The beneficial effects of the utility model are as follows: the piston rod of the double-rod oil cylinder of the utility model realizes the assembly of the piston and the piston rod through mechanical positioning, the mechanical processing difficulty is small, the installation is convenient, no secondary processing is required, the assembly parts are easy to replace when damaged, and the maintenance cost is reduced.

[0015] The piston rod of the double-rod oil cylinder of the utility model is used to axially position the piston through a semicircular key and the piston rod, and is matched with a sleeve and a fastener to prevent the piston from loosening. The utility model has the advantages of simple structure, convenient assembly and disassembly, and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0017] Figure 1 It is a structural schematic diagram of a preferred embodiment of the piston rod of the double-rod oil cylinder of the utility model;

[0018] Figure 2 yes Figure 1 Schematic diagram of the local structure;

[0019] Figure 3 It is a schematic diagram of the integrated structure of the piston and the piston rod;

[0020] Figure 4 It is a schematic diagram of the split threaded connection structure between the piston and the piston rod;

[0021] Figure 5 It is a schematic diagram of the expansion joint structure between the piston and the piston rod;

[0022] The markings of the components in the accompanying drawings are as follows: 1. piston rod, 2. semicircular key, 3. sleeve, 4. half piston, 5. fastener. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiment of the utility model will be described clearly and completely below. The structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions that can be implemented in the utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by the utility model and the purpose that can be achieved, should still fall within the scope of the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of narration, and are not used to limit the scope that can be implemented. The change or adjustment of its relative relationship should also be regarded as the scope that can be implemented in the utility model without substantially changing the technical content.

[0024] See also Figure 1 and Figure 2 , a piston rod of a double-rod oil cylinder, a keyway is provided on the circumference of the piston rod 1, and a semicircular key 2 is embedded in the keyway. The semicircular key 2 protrudes from the surface of the piston rod 1 in the radial direction, and the semicircular key 2 and the piston rod 1 form a step structure, which provides axial end face positioning for the subsequent installation of the piston. The keyway is simple to process, with low difficulty and high processing accuracy.

[0025] After the semicircular key 2 is assembled, a sleeve 3 is sleeved on the outer side of the semicircular key 2. The sleeve 3 presses the semicircular key 2 onto the piston rod 1 to ensure the assembly accuracy of the semicircular key 2 and the piston rod 1.

[0026] The sleeve 3 is a threaded sleeve. The threaded sections are located at the left and right ends of the sleeve 3. The semi-piston 4 is then threadedly connected to the sleeve 3. Due to the presence of the step structure, the end surface of the inner hole of the semi-piston 4 contacts and positions the step structure. At this time, the semi-piston 4 is installed in the correct position, and the axial positioning of the semi-piston 4 is achieved. The threaded connection ensures that the piston connection is stable.

[0027] The inner hole end surface of the semi-piston 4 is provided with a gap from the sleeve 3. The middle part of the sleeve 3 has a convex part, which convexly protrudes in the radial direction, and a gap is provided between the convex part and the semi-piston 4. The length of the sleeve 3 is less than or equal to the length of the semi-round key 2.

[0028] After installing the semi-piston 4 at both ends of the sleeve 3, a fastener 5 is installed in the radial direction of the semi-piston 4. The fastener 5 presses the sleeve 3 so that the sleeve 3 is pressed against the semi-circular key 2, and the inner hole of the semi-piston 4 contacts and positions the end surface of the semi-circular key 2. The semi-piston 4 has a threaded hole, and the fastener 5 is threadedly connected in the threaded hole, and the lower end of the fastener 5 presses the sleeve 3. The fastener is a set screw, which is screwed into the end of the semi-piston 4. The set screw passes through the semi-piston 4 and contacts the surface of the sleeve 3, so that the semi-piston 4 and the sleeve 3 are pressed tightly to prevent the thread between the piston and the sleeve 3 from loosening.

[0029] Different from the prior art, the piston rod of the double-rod oil cylinder of the utility model has two half pistons connected by a sleeve to form an integral piston, which is simple to machine, quick to assemble, accurate in piston assembly position, easy to replace parts, and reduces use costs.

[0030] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A piston rod of a double-rod oil cylinder, characterized in that: A keyway is provided on the circumference of the piston rod (1), a semicircular key (2) is embedded in the keyway, a sleeve (3) is sleeved on the outer side of the semicircular key (2), half pistons (4) are sleeved on both ends of the sleeve (3), a fastener (5) is installed in the radial direction of the semi-piston (4), the fastener (5) presses the sleeve (3) so that the sleeve (3) is pressed against the semicircular key (2), and the inner hole of the semi-piston (4) contacts and is positioned with the end face of the semicircular key (2).

2. The piston rod of the double-rod oil cylinder according to claim 1, characterized in that: The semicircular key (2) protrudes from the surface of the piston rod (1) in the radial direction, the semicircular key (2) and the piston rod (1) form a step structure, and the end surface of the inner hole of the semi-piston (4) is in contact with the step structure for positioning.

3. The piston rod of the double-rod oil cylinder according to claim 1, characterized in that: The sleeve (3) is a threaded sleeve (3), and the half piston (4) is threadedly connected to the sleeve (3).

4. The piston rod of the double-rod oil cylinder according to claim 2, characterized in that: The half piston (4) has a threaded hole, the fastener (5) is threadedly connected in the threaded hole, and the lower end of the fastener (5) presses the sleeve (3).

5. The piston rod of the double-rod oil cylinder according to claim 1, characterized in that: The length of the sleeve (3) is less than or equal to the length of the semicircular key (2).

6. The piston rod of the double-rod oil cylinder according to claim 5, characterized in that: A clearance is provided between the inner hole end surface of the half piston (4) and the sleeve (3).

7. The piston rod of the double-rod oil cylinder according to claim 6, characterized in that: The sleeve (3) has a raised portion in the middle, the raised portion is raised in the radial direction, and a gap is provided between the raised portion and the half piston (4).

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