Manual hydraulic tube expander

Abstract

A manual hydraulic tube expander, comprising a handle (1), having a holding part (11); a wrench (2), rotatably arranged with respect to the handle (1); a plunger (3), arranged to reciprocate with respect to the handle (1); a tube expansion assembly (4), comprising a tube expansion cylinder (41) and, arranged in the tube expansion cylinder (41), a piston (42) and a conical head (43); and an oil bag (5), wherein the handle (1) and the wrench (2) are configured in such a way that when the wrench (2) has the maximum swing angle, the projections of the wrench (2) and the holding part (11) of the handle (1) on a swing plane formed by the wrench (2) coincide with each other.

Description

Manual hydraulic tube expander Technical Field

[0001] The utility model belongs to the technical field of manual hydraulic tube expanders, in particular to a manual hydraulic tube expander. Background Art

[0002] US Patent No. 9987672B2 discloses a manual hydraulic tube expander. Its main structure includes a handle, a wrench swingably mounted on the handle, a plunger located below the upper end of the wrench, an oil bag within the handle, a one-way valve at the oil bag outlet, an oil supply line, an oil return line, a piston, a cone head, and a removable expansion head to accommodate different pipe diameters. The operating principle is that the handle is held by the palm of the hand and the wrench is operated by the fingers. As the wrench moves toward the handle, it pushes the plunger, pressurizing the oil in the oil bag onto the piston, causing the piston and cone head to move outward. The cone head then causes the six fan-shaped components of the expansion head to expand radially outward, achieving tube expansion.

[0003] When the applicant used a product similar to the aforementioned U.S. invention patent solution, he found that the aforementioned structure had the following problems: 1. The handle has a complete outer periphery. When the wrench abuts the outer surface of the handle, the plunger's stroke reaches its maximum. When operated with one hand, due to the size limitation of the human hand, the maximum swing angle of the wrench and the length of the wrench's force point (finger pressing position) from the rotation axis cannot be taken into account at the same time; 2. The oil bag is arranged in the handle, which makes the handle larger and the design space of the handle limited; 3. The wrench is located below the cone head, and the length of the wrench is limited; 4. The direction of movement of the plunger is opposite to that of the piston, and the oil circuit is more complicated and difficult to process. At the same time, the oil circuit is long and has turns, which is not conducive to oil supply; 5. The plunger is always tilted downward due to the force from the wrench, and one-side wear is serious, which is prone to oil leakage.

[0004] Summary of the Invention

[0005] The present invention addresses the drawback of existing manual hydraulic tube expanders, where the plunger reaches its maximum travel when the wrench abuts the outer surface of the handle, and the distance between the wrench's force point and the rotation axis is limited by the wrench's maximum swing angle. By providing a manual hydraulic tube expander, the wrench's force point can be further away from its rotation axis while maintaining the wrench's maximum swing angle, thus saving more effort. Furthermore, the present invention addresses the other problems mentioned in the background art.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a manual hydraulic tube expander, the manual hydraulic tube expander comprising:

[0007] a handle having a grip portion;

[0008] a wrench, swinging relative to the handle;

[0009] a plunger that reciprocates relative to the handle;

[0010] Oil bags;

[0011] An expansion assembly, comprising an expansion barrel, a piston and a cone head provided in the expansion barrel, and an expansion head provided on the expansion barrel, wherein the expansion assembly forms an oil path respectively communicating with the oil bag, the plunger, and the piston;

[0012] The handle and the wrench are configured such that when the swing angle of the wrench is maximum, projections of the wrench and the gripping portion of the handle on the swing plane formed by the wrench overlap.

[0013] Compared to the prior art where the wrench can only abut the outer surface of the handle at most, the manual hydraulic tube expander of the present invention has an overlap in projections of the wrench and the gripping portion of the handle on the swing plane formed by the wrench when the swing angle of the wrench is maximum. That is, when the swing angle of the wrench is maximum, the pulling position of the finger on the wrench can be further away from the rotation axis of the wrench, which is more labor-saving. The overlap of the projections of the gripping portion of the wrench and the handle on the swing plane formed by the wrench can be achieved by misaligning the gripping portion of the wrench and the handle, or by providing a receiving groove or avoidance groove on the handle. In the process of operating the wrench to rotate the wrench toward the handle, when the wrench cannot continue to move in this direction, the swing angle of the wrench reaches its maximum. At this time, the stroke of the plunger usually also reaches its maximum, and the plunger cannot continue to move toward the piston.

[0014] As an improvement, the handle forms a wrench groove for accommodating the wrench.

[0015] As an improvement, the wrench groove is formed at the center of the thickness direction of the handle, so that the cross section of the handle is generally concave. In other solutions, the wrench groove can also be formed at the edge of the thickness direction of the handle, so that the cross section of the handle is generally L-shaped.

[0016] As an improvement, when the wrench's swing angle is maximum, the wrench is only partially accommodated in the wrench slot. Actual use has shown that fully accommodating the wrench in the wrench slot, while more labor-efficient than only partially accommodating the wrench in the slot, provides a less pleasant operating experience. Therefore, designing the manual hydraulic tube expander so that the wrench is only partially accommodated in the wrench slot offers a better operating experience and still offers greater labor-saving advantages compared to existing technologies.

[0017] As an improvement, the handle includes a first handle shell and a second handle shell that are surface-fitted, and the first handle shell and the second handle shell are fixedly connected by screws along the thickness direction of the handle.

[0018] As an improvement, a positioning structure is formed between the first handle shell and the second handle shell, and the positioning structure includes a plurality of groups of matching positioning holes and positioning columns.

[0019] As an improvement, the manual hydraulic tube expander also includes a housing comprising a first shell and a second shell. The first and second shells are secured together by screws along the thickness of the handle, and the lower end of the housing engages the upper end of the handle along its height. Compared to an integrated housing and handle (i.e., a single housing), the present invention separates the housing and handle. This allows the first and second handle shells to move relative to the housing within a certain range if manufacturing errors occur in the bracket, facilitating assembly of the bracket and handle.

[0020] As an improvement, a positioning structure is formed between the first shell and the second shell, and the positioning structure includes a plurality of groups of matching positioning holes and positioning columns.

[0021] As an improvement, the angle between the cover and the end surface of the handle close to the wrench is between 95° and 120°.

[0022] As an improvement, the oil bag is located between the plunger and the piston. The wrench slot includes a side slot located near the wrench and a top slot located at the top of the handle. The side slot and the top slot are connected. The handle is provided with a pair of brackets, the upper ends of which are higher than the handle. The wrench is rotatably connected to the brackets. By changing the oil bag from being located in the handle to being located between the plunger and the piston, the handle design has more space and the size of the one-handed operation portion of the handle can be smaller, which helps save effort.

[0023] As an improvement, the upper end of the wrench has two parallel parts, and a roller is provided between the two parallel parts for contacting the plunger, and the rotation axis of the roller is higher than the rotation axis of the wrench. Using the roller to connect the wrench and the plunger can reduce friction and wear.

[0024] As an improvement, a rotating mounting hole and a roller mounting hole are provided on the two parallel parts at the upper end of the wrench. A pin is provided in the rotating mounting hole, and a sleeve is provided outside the pin that rotates relative to it. The pin is larger in the middle and smaller at both ends, and anti-loosening nuts are provided at both ends of the pin.

[0025] As an improvement, a gasket is provided between the two parallel parts of the wrench and the bracket; a pin is provided in the roller mounting hole, and retaining springs are provided at both ends of the pin, and the roller is loosely fitted with the pin.

[0026] As an improvement, the roller has a middle step and protruding sections at both ends, and the large diameter portion of the step abuts against the plunger.

[0027] As an improvement, when the wrench is in a first extreme position away from the handle, the rotation axis of the roller is located on one side of the wrench's rotation axis. When the wrench is in a second extreme position close to the handle, the rotation axis of the roller is located on the other side of the wrench's rotation axis. With this structure, as the wrench moves toward the handle, the force exerted by the roller on the plunger changes from one direction to another, rather than always in one direction as in the prior art. This prevents the sealing ring on the plunger from being constantly subjected to force on one side.

[0028] As an improvement, the cross section of the wrench is U-shaped.

[0029] As an improvement, a limiting column is provided between a pair of the brackets to limit the maximum swing angle of the wrench.

[0030] As an improvement, the bracket has a parallel section parallel to the grip portion, which extends upward and away from the wrench to form an inclined section. Compared to a straight bracket, the bracket with an inclined section allows the wrench's rotation axis to be further away from the plunger, shifting the center of gravity of the manual hydraulic tube expander further away from the wrench, resulting in a more optimized layout.

[0031] As an improvement, the upper portion of the handle extends away from the wrench to form a protrusion.

[0032] As an improvement, a plunger cavity is formed in the tube expansion barrel, and one end of the plunger is located in the plunger cavity.

[0033] As an improvement, the oil bag is sleeved outside the expansion tube.

[0034] As an improvement, the oil bag is located in the handle, the upper end of the wrench is pivotally connected to the handle, and the plunger is located below the wrench's rotation axis. This structure, based on the existing design, requires minor modifications. In this case, the oil bag and wrench can be arranged by reducing the size of the oil bag and adjusting its position and structure in the handle.

[0035] As an improvement, when the swing angle of the wrench is maximum, the wrench and the handle are misaligned, and the projections of the gripping parts of the wrench and the handle on the swing plane formed by the wrench overlap.

[0036] The beneficial effects of the manual hydraulic tube expander of the present invention are as follows: a wrench groove is formed on the handle, and the wrench groove can be fully or partially accommodated in the wrench groove. Therefore, when the maximum swing angle of the wrench remains unchanged, the finger's pulling position on the wrench can be further away from the wrench's rotation axis, which is more labor-saving. Furthermore, the oil bag is arranged between the plunger and the piston, which increases the design space of the handle. At the same time, the size of the single-handed operation part of the handle can be smaller, which is conducive to labor saving. The rotation axis of the wrench is located above the handle and behind the plunger, which allows for a longer wrench length. The direction of movement of the plunger is the same as that of the piston, which simplifies the oil circuit, is easy to process, and has a short oil circuit path. The force applied to the plunger from the wrench is not always in the same direction, so it does not wear on one side and is less likely to leak oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 and FIG2 are structural schematic diagrams of a manual hydraulic tube expander according to a first embodiment of the present invention at different angles.

[0038] FIG3 is a cross-sectional view of the manual hydraulic tube expander of the first embodiment of the present invention (when the wrench is in the first extreme position away from the handle)

[0039] FIG4 is a cross-sectional view of the manual hydraulic tube expander according to the first embodiment of the present invention (when the wrench is at the second extreme position close to the handle).

[0040] FIG5 is an exploded view of the structure of the manual hydraulic tube expander according to the first embodiment of the present invention.

[0041] FIG6 is a schematic structural diagram of the manual hydraulic tube expander according to the first embodiment of the present invention with some components hidden.

[0042] FIG7 is an exploded view of the handle of the manual hydraulic tube expander according to the first embodiment of the present invention.

[0043] FIG8 is a partial structural diagram of a manual hydraulic tube expander according to the first embodiment of the present invention.

[0044] FIG9 is a partial structural exploded view of the manual hydraulic tube expander according to the first embodiment of the present invention.

[0045] FIG10 is a schematic structural diagram of a wrench of a manual hydraulic tube expander according to a first embodiment of the present invention.

[0046] In the figure, 1, handle; 1A, first handle shell; 1B, second handle shell; 11, grip portion; 12, protrusion; 13, wrench slot; 14, positioning hole; 15, positioning column;

[0047] 2. Wrench; 21. Parallel portion; 22. Rotation mounting hole; 23. Roller mounting hole; 24. Middle portion; 25. Finger force bearing portion;

[0048] 3. Plunger;

[0049] 4. Tube expansion assembly; 41. Tube expansion cylinder; 42. Piston; 43. Cone head;

[0050] 5. Oil bag;

[0051] 6. Bracket;

[0052] 7. Roller;

[0053] 8. Cover;

[0054] 9. Limit column.

[0055] DETAILED DESCRIPTION

[0056] The technical solutions of the embodiments of the present invention are explained and described below, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0057] Example 1

[0058] 1 to 10 , a manual hydraulic tube expander according to a first embodiment of the present invention is shown, comprising:

[0059] A handle 1 having a grip portion 11;

[0060] The wrench 2 rotates relative to the handle 1;

[0061] The plunger 3 reciprocates relative to the handle 1;

[0062] Oil bag 5;

[0063] The expansion assembly 4 includes an expansion barrel 41, a piston 42 disposed in the expansion barrel 41, a cone head 43, and an expansion head disposed on the expansion barrel 41; the expansion assembly 4 forms an oil path connecting the oil bag 5, the plunger 3, and the piston 42 respectively;

[0064] The handle 1 and the wrench 2 are configured such that when the wrench 1 swings at the maximum angle, the wrench 2 and the projections of the gripping portion 11 of the handle 1 on the swinging plane formed by the wrench 2 overlap.

[0065] In the figure, the expansion head is not shown.

[0066] In this embodiment, the handle 1 forms a wrench groove 13 for accommodating the wrench 2 .

[0067] In other embodiments, the wrench groove may also be formed at the edge of the handle in the thickness direction, so that the cross section of the handle is generally L-shaped.

[0068] In this embodiment, referring to FIG4 , when the swing angle of the wrench 2 reaches the maximum, a small part of the wrench 2 is still located outside the wrench slot 13 , so that the wrench 2 is not completely accommodated in the wrench slot 13 , so that the user can obtain a better operating experience.

[0069] In this embodiment, the handle 1 includes a first handle shell 1A and a second handle shell 1B that are surface-fitted together. The first handle shell 1A and the second handle shell 1B are fixed together by screws along the thickness direction of the handle 1 .

[0070] In this embodiment, the fitting surface of the first handle shell 1A and the second handle shell 1B is one.

[0071] In this embodiment, a positioning structure is formed between the first handle shell 1A and the second handle shell 1B. This positioning structure includes multiple sets of cooperating positioning holes 14 and positioning posts 15. When assembling the handle 1, simply align the positioning posts 15 with the positioning holes 14 and install the screws. The positioning holes 14 are countersunk. The positioning structure also includes cooperating positioning strips and positioning grooves formed on the edges. Reinforcing ribs are formed in the first handle shell 1A and / or the second handle shell 1B.

[0072] In this embodiment, the first handle shell 1A and the second handle shell 1B of the handle 1 can each be integrally formed with a flexible member, which is located at the grip portion 11 to improve the user's hand feeling. The first handle shell 1A and the second handle shell 1B are usually made of hard plastic.

[0073] In this embodiment, the oil bag 5 is located between the plunger 3 and the piston 42. The oil bag 5 is changed from being located in the handle 1 as in the prior art to being located between the plunger 3 and the piston 42. The design space of the handle 1 is larger. At the same time, the size of the one-handed operation part of the handle 1 can be smaller, which is conducive to saving effort.

[0074] In this embodiment, the wrench groove 13 includes a side groove located on the side close to the wrench 2 and a top groove located on the top of the handle 1. The side groove and the top groove are connected to each other. A pair of brackets 6 are provided in the handle 1. The upper end of the bracket 6 is higher than the handle 1, and the wrench 2 is rotatably connected to the bracket 6.

[0075] In this embodiment, the upper end of the wrench 2 has two parallel portions 21, and a roller 7 is provided between the two parallel portions 21 for contacting the plunger 3. The rotation axis of the roller 7 is higher than the rotation axis of the wrench 2. The use of the roller 7 to connect the wrench 2 and the plunger 3 can reduce friction and wear.

[0076] In this embodiment, the two parallel portions 21 at the upper end of the wrench 2 define a rotational mounting hole 22 and a roller mounting hole 23. A pin is positioned in the rotational mounting hole 22, and a sleeve is positioned outside the pin to rotate relative to it. The pin is larger in the middle and smaller at the ends, and each end of the pin is provided with a locknut. A spacer is also positioned between the parallel portion 21 of the wrench 2 and the bracket 6. This mounting structure prevents the wrench 2 from wobbling along the thickness direction of the handle 1. Furthermore, the sleeve reduces friction and increases its service life.

[0077] In this embodiment, a pin is provided in the roller mounting hole 23 , and retaining springs are provided at both ends of the pin. The roller 7 is loosely fitted with the pin.

[0078] In this embodiment, the wrench 2 has a uniform thickness at all locations, and the cross section of the wrench 2 is U-shaped. The wrench 2 can be made of metal.

[0079] In this embodiment, a limiting column 9 for limiting the maximum swing angle of the wrench 2 is provided between a pair of the brackets 6. The limiting column 9 is large in the middle and small at both ends, and the two ends of the limiting column 9 are inserted into the two brackets 6.

[0080] In this embodiment, a plunger 3 cavity is formed in the expansion tube 41 , and one end of the plunger 3 is located in the plunger 3 cavity.

[0081] In this embodiment, referring to Figures 3 and 4 , when the wrench 2 is in a first extreme position away from the handle 1, the rotation axis of the roller 7 is located on one side of the rotation axis of the wrench 2. When the wrench 2 is in a second extreme position close to the handle 1, the rotation axis of the roller 7 is located on the other side of the rotation axis of the wrench 2. With this structure, as the wrench 2 moves toward the handle 1, the force exerted by the roller 7 on the plunger 3 changes from one direction to another, rather than always in one direction as in the prior art, thereby preventing the sealing ring on the plunger 3 from being constantly subjected to force on one side.

[0082] In this embodiment, the grip portion 11 is located at the bottom of the handle 1. The upper portion of the handle 1 extends away from the wrench 2 to form a protrusion 12. The bracket 6 has a parallel section parallel to the grip portion 11. This parallel section extends upward and away from the wrench 2 to form an inclined section. The inclined section of the bracket 6 allows the rotation axis of the wrench 2 to be further away from the plunger 3 than if the bracket 6 were entirely linear. This further moves the center of gravity of the manual hydraulic tube expander away from the wrench 2, resulting in a more optimized layout for the manual hydraulic tube expander.

[0083] In this embodiment, the oil bag 5 is sleeved outside the expansion tube 41. An oil storage space is formed between the outer wall of the expansion tube 41 and the inner wall of the oil bag 5. The expansion tube 41 forms an oil supply circuit and an oil return circuit.

[0084] In this embodiment, referring to Figure 5 , the manual hydraulic tube expander further includes a housing 8 comprising a first shell and a second shell. The first and second shells are secured together by screws along the thickness of the handle 1. The lower end of the housing 8 is engaged with the upper end of the handle 1 along its height. Unlike prior art designs where the housing 8 and handle 1 are integrally provided, the housing 8 is provided separately from the handle 1, facilitating assembly of the bracket 6 and the handle 1.

[0085] In this embodiment, referring to Figure 2 , the angle between the cover 8 and the handle 1 is between 95° and 120°. Specifically, in this embodiment, the angle is 100°.

[0086] In this embodiment, referring to FIG. 3 and FIG. 4 , the wrench 2 includes a rotation connection portion, an intermediate portion 24 and a finger force portion 25 , wherein the finger force portion 25 of the wrench 2 is parallel to the surface formed by the rotation axis of the wrench 2 and the rotation axis of the roller 7 .

[0087] For other unfinished structures of this embodiment, please refer to the drawings and prior art.

[0088] The working principle of the manual hydraulic tube expander of this embodiment is as follows: Referring to FIG3 , when no external force is applied, the wrench 2 is opened to its maximum angle under the action of the compression spring on the plunger 3. At this time, the cone head 43 and the piston 42 are also at their closest distance to the handle 1, i.e., their extended length is minimized, due to the action of the compression spring on the cone head 43. Referring to FIG4 , when the handle 1 is held in one hand, the finger applies force to the wrench 2, causing the wrench 2 to swing toward the handle 1. Due to the presence of the wrench slot 13 in the handle 1, the wrench 2 reaches its maximum rotation angle until it abuts the limit post 9 in the handle 1, at which point the stroke of the plunger 3 also reaches its maximum. The provision of the wrench slot 13 reduces the angle between the wrench 2 and the handle 1 when no external force is applied, allowing the finger to apply force to the wrench 2 farther from the wrench 2's rotation axis, saving more effort. When the finger is released, the wrench 2 and the plunger 3 return to their original position under the action of the compression spring on the plunger 3. The wrench 2 is operated repeatedly in this way for many times. When the compression is sufficient, the oil pressure at the piston 42 reaches the pressure relief pressure, and the pressure relief valve automatically relieves the pressure to complete the tube expansion. After the pressure relief, the piston 42 and the cone head 43 are reset under the action of the compression spring at the cone head 43. When it is necessary to relieve the pressure before the pressure relief pressure is reached or the pressure relief valve fails, the pressure relief member on the cover 8 can be manually operated to achieve pressure relief.

[0089] The beneficial effects of the manual hydraulic tube expander of the first embodiment of the present invention are as follows: a wrench groove 13 is formed on the handle 1, and the wrench groove 13 is not completely accommodated in the wrench groove 13, so that when the maximum swing angle of the wrench 2 remains unchanged, the pulling position of the finger on the wrench 2 can be further away from the rotation axis of the wrench 2, which is more labor-saving; the oil bag 5 is arranged between the plunger 3 and the piston 42, and the design space of the handle 1 is larger. At the same time, the size of the one-handed operation part of the handle 1 can be smaller, which is conducive to labor-saving; the rotation axis of the wrench 2 is located above the handle 1 and behind the plunger 3, and the length of the wrench 2 can be larger; the moving direction of the plunger 3 is the same as the moving direction of the piston 42, the oil circuit is simple, easy to process, and the oil circuit path is short; the plunger 3 is subjected to the force from the wrench 2 in non-constant directions, and is not unilaterally worn, so the service life of the sealing ring at the plunger 3 is longer and oil leakage is not prone to occur.

[0090] Example 2

[0091] In this embodiment, the oil bag is located within the handle, the upper end of the wrench is pivotally connected to the handle, and the plunger is located below the wrench's rotational axis. This structure, based on the US patent proposal, has been modified slightly. The oil bag and wrench can be arranged by reducing the size of the oil bag and adjusting its position and structure within the handle.

[0092] Example 3

[0093] In this embodiment, when the swing angle of the wrench is maximum, the wrench and the handle are misaligned, and the projections of the gripping portions of the wrench and the handle on the swing plane formed by the wrench overlap.

[0094] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes but is not limited to the contents described in the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are included within the scope of the claims.

Claims

1. Manual hydraulic tube expander, characterized by: The manual hydraulic tube expander comprises: A handle (1) having a gripping portion (11); A wrench (2) is swung relative to the handle (1); A plunger (3) reciprocates relative to the handle (1); Oil bags (5); An expansion assembly (4) comprising an expansion tube (41), a piston (42) and a cone head (43) arranged in the expansion tube (41), and an expansion head arranged on the expansion tube (41), wherein the expansion assembly (4) forms an oil path respectively communicating with the oil bag (5), the plunger (3), and the piston (42); The handle (1) and the wrench (2) are configured such that when the swing angle of the wrench (2) is maximum, the projections of the wrench (2) and the gripping portion (11) of the handle (1) on the swing plane formed by the wrench (2) overlap.

2. The manual hydraulic tube expander according to claim 1, characterized in that: The handle (1) forms a wrench groove (13) for accommodating the wrench (2).

3. The manual hydraulic tube expander according to claim 2, characterized in that: The wrench groove (13) is formed in the middle of the handle (1) in the thickness direction; when the swing angle of the wrench (2) is maximum, the wrench (2) is only partially accommodated in the wrench groove (13).

4. The manual hydraulic tube expander according to claim 2 or 3, characterized in that: The handle (1) comprises a first handle shell (1A) and a second handle shell (1B) which are fitted together, the first handle shell (1A) and the second handle shell (1B) being fixedly connected by screws along the thickness direction of the handle (1), and a positioning structure is formed between the first handle shell (1A) and the second handle shell (1B); The manual hydraulic tube expander further comprises a cover shell (8), the cover shell (8) comprising a first shell and a second shell, the first shell and the second shell being fixedly connected by screws along the thickness direction of the handle (1), and the lower end of the cover shell (8) is clamped with the upper end of the handle (1) along the height direction; The angle between the cover (8) and the end surface of the handle (1) close to the wrench (2) is between 95° and 120°.

5. The manual hydraulic tube expander according to claim 2 or 3, characterized in that: The oil bag (5) is located between the plunger (3) and the piston (42); the wrench groove (13) comprises a side groove located on a side close to the wrench (2) and a top groove located on the top of the handle (1); the side groove and the top groove are connected; a pair of brackets (6) are provided in the handle (1); the upper ends of the brackets (6) are higher than the handle (1); and the wrench (2) is rotatably connected to the brackets (6); The wrench (2) has two parallel parts (21) at the upper end, and a roller (7) for abutting against the plunger (3) is provided between the two parallel parts (21), and the rotation axis of the roller (7) is higher than the rotation axis of the wrench (2).

6. The manual hydraulic tube expander according to claim 5, characterized in that: A rotational mounting hole (22) and a roller mounting hole (23) are provided on the two parallel parts (21) at the upper end of the wrench (2), a pin is provided in the rotational mounting hole (22), a shaft sleeve is provided outside the pin for rotating relative to the pin, the pin is larger in the middle and smaller at both ends, and anti-loosening nuts are provided at both ends of the pin; A gasket is also provided between the two parallel parts (21) of the wrench (2) and the bracket (6); a pin is provided in the roller mounting hole (23), and retaining springs are provided at both ends of the pin, and the roller (7) is loosely matched with the pin; The roller (7) has a middle step and protruding sections at both ends, and the large diameter portion of the step abuts against the plunger (3).

7. The manual hydraulic tube expander according to claim 5, characterized in that: When the wrench (2) is located at a first extreme position away from the handle (1), the rotation axis of the roller (7) is located on one side of the rotation axis of the wrench (2); when the wrench (2) is located at a second extreme position close to the handle (1), the rotation axis of the roller (7) is located on the other side of the rotation axis of the wrench (2); The wrench (2) has a U-shaped cross section; The wrench (2) further comprises a middle portion (24) and a finger force-bearing portion (25), wherein the finger force-bearing portion (25) of the wrench (2) is parallel to a plane formed by a rotation axis of the wrench (2) and a rotation axis of the roller (7); A limit column (9) for limiting the maximum swing angle of the wrench (2) is provided between the pair of brackets (6); The bracket (6) has a parallel section parallel to the gripping portion (11), and the parallel section extends obliquely upward in a direction away from the wrench (2) to form an inclined section.

8. The manual hydraulic tube expander according to claim 4, characterized in that: The upper portion of the handle (1) extends toward a side away from the wrench (2) to form a protrusion (12); The oil bag (5) is sleeved outside the expansion tube (41); A plunger cavity is formed in the expansion tube (41), and one end of the plunger (3) is located in the plunger cavity.

9. The manual hydraulic tube expander according to claim 2 or 3, characterized in that: The oil bag (5) is arranged in the handle (1), the upper end of the wrench (2) is rotatably connected to the handle (1), and the plunger (3) is located below the rotation axis of the wrench (2).

10. The manual hydraulic tube expander according to claim 1, characterized in that: When the swing angle of the wrench (2) is maximum, the wrench (2) and the handle (1) are misaligned, and the projections of the gripping portions (11) of the wrench (2) and the handle (1) on the swing plane formed by the wrench (2) overlap.

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